MURATA POWER SOLUTIONS UEI25-050-D48N-C

UEI25 Series www.murata-ps.com Single Output Isolated 25-Watt DC/DC Converters Output (V) Current (A) Nominal Input (V) 3.3 7.5 48 Typical unit 55 48 12 2.1 48 FEATURES PRODUCT OVERVIEW  Cost effective small footprint DC/DC converter, Featuring a full 25 Watt output in one square inch offer fast settling to step transients and will accept ideal for high current applications of board area, the UEI25 series isolated DC/DC higher capacitive loads. Excellent ripple and noise converter family offers effi cient regulated DC power specifi cations assure compatibility to noise-sus-  Industry standard 0.96" x 1.1" x 0.32" open for printed circuit board mounting. The 0.96" x 1.1" ceptible circuits. For systems requiring controlled frame package and pinout x 0.32" (24.4 x 27.9 x 8.1 mm) converter accepts a startup/shutdown, an external remote On/Off control  Input voltage range of 36-75 Vdc 2:1 input voltage range of 36 to 75 Volts DC, ideal may use a switch, transistor or digital logic. for telecom equipment. The industry-standard pin- A wealth of self-protection features avoid both  3.3V, 5V, or 12Vdc fi xed output voltages out fi ts larger 1" x 2" converters. The fi xed output converter and external circuit faults. These include  Isolation up to 2250 VDC (basic) voltage is tightly regulated. Applications include input undervoltage lockout and overtemperature  Up to 25 Watts total output power with exten- small instruments, area-limited microcontrollers, shutdown. The outputs current limit using the sive self-protection shutdown features data communications equipment, remote sensor “hiccup” autorestart technique and the outputs are systems, telephone equipment, vehicle and portable short-circuit protected. Additional features include  High effi ciency synchronous rectifi er forward electronics. output overvoltage and reverse conduction elimina- topology up to 91% The UEI25 series includes full magnetic and tion. The high effi ciency offers minimal heat buildup  Stable operation with no required external optical isolation with Basic protection up to 2250 and “no fan” operation. components Volts DC. For powering digital systems, the outputs  Usable -40 to 85°C temperature range (with derating)  Certifi ed to UL 60950-1, CAN/CSA-C22.2 No. 60950-1, IEC60950-1, EN60950-1 safety approvals, 2nd edition F1 +Vin (1) *TPMBUJPO +Vout (3) Barrier t
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Trim (4) MPHJD -Vin (2) -Vout (5) Figure 1. Connection Diagram Typical topology is shown. Murata Power Solutions recommends an external fuse. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_UEI25W.B10 Page 1 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀ ➂ Output Input R/N (mVp-p) Regulation (Max.) IIN, IIN, EfŢ ciency Package, C75 IOUT Total VIN min. full VOUT (A, Power Nom. Range load load Root Models ➀ (V) max) (W) Typ. ➁ Max. Line Load (V) (V) (mA) (A) Min. Typ. Case (inches) Case (mm) Pinout UEI25-033-D48 ➃ 3.3 7.5 25 50 80 ±0.1% ±0.2% 48 36-75 75 0.58 87.0% 89.5% 0.96x1.1x0.32 24.4x27.9x8.1 P85 UEI25-050-D48 5 5 25 50 80 ±0.1% ±0.2% 48 36-75 30 0.57 89.0% 91% 0.96x1.1x0.32 24.4x27.9x8.1 P85 UEI25-120-D48 12 2.1 25.2 95 120 ±0.1% ±0.1% 48 36-75 20 0.6 86.0% 87.5% 0.96x1.1x0.32 24.4x27.9x8.1 P85 Notes: ➀ Please refer to the part number structure for additional options and complete order- Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. The input cap ing part numbers. is 4.7 μF ceramic, low ESR. ➁ Ripple and Noise is shown at 20 MHz bandwidth. I/O caps are necessary for our test equipment and may not be needed for your ap- ➂ All specifi cations are at nominal line voltage and full load, +25 °C. unless otherwise plication. ➃ Minimum load is 10% for rated specifi cations. noted. See detailed specifi cations for full conditions. PART NUMBER STRUCTURE UEI25 - 033 - D48 P M Lx - C Unipolar Output Isolated RoHS-6 Hazardous Substance Compliance 25-Watt Series (Does not claim EU RoHS exemption 7b, lead in solder) Nominal Output Voltage Pin Length Option (through-hole only) in Tenths of a Volt Blank = Std. pin length 0.25˝ (6.3mm) L1 = 0.110˝ (2.79mm) ➀ L2 = 0.145˝ (3.68mm) ➀ Input Voltage Range Surface Mount Option D48 = 36-75 Vdc Blank = Through-hole mount M = Surface mount (MSL rating 2) ➁ On/Off Control Logic: P = Positive N = Negative ➀ Special quantity order is required; samples available with standard pin length only. ➁ SMT (M) versions not available in sample quantities. ➂ Some model number combinations may not be available. See website or contact your local Murata sales representative. www.murata-ps.com/support MDC_UEI25W.B10 Page 2 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS – MODEL UEI25-033-D48 ABSOLUTE MAXIMUM RATINGS Conditions ➀ Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 80 Vdc Operating or non-operating, 100 mS max. Input Voltage, Transient 0 100 Vdc duration Isolation Voltage Input to output 2250 Vdc Input Reverse Polarity None, install external fuse None Vdc On/Off Remote Control Power on or off, referred to -Vin 0 15 Vdc Output Power 0 25.25 W Output Current Current-limited, no damage, short-circuit protected 0 7.5 A Storage Temperature Range Vin = Zero (no power) -55 125 ˚C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi cations Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 1.5 A Start-up threshold Rising input voltage 34 35.2 36 Vdc Undervoltage shutdown Falling input voltage 32 34.0 35.2 Vdc Overvoltage shutdown None Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type LC Input current Full Load Conditions Vin = nominal 0.58 0.60 A Low Line Vin = minimum 0.79 0.81 A Inrush Transient 0.05 A2-Sec. Output in Short Circuit 50 100 mA No Load Iout = minimum, unit=ON 75 100 mA Standby Mode (Off, UV, OT) 12 mA Measured at input with specifi ed fi lter 30 mA, RMS Reţ ected (back) ripple current ➁ Pre-biased startup External output voltage < Vset Monotonic GENERAL and SAFETY Vin=48V, full load 87 89.5 % EfŢ ciency Vin=36V, full load 86.5 87.5 % Isolation Isolation Voltage Input to output, continuous 2250 Vdc Insulation Safety Rating basic Isolation Resistance 10 Mohm Isolation Capacitance 1000 pF Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1, Safety Yes IEC/EN60950-1, 2nd edition Per MIL-HDBK-217F, ground benign, 6 Calculated MTBF TBD Hours x 10 Tambient=+30˚C Per Telcordia SR332, issue 1, class 3, ground 6 Calculated MTBF 2 Hours x 10 fi xed, Tambient=+40°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 300 330 360 KHz Startup Time Power On to Vout regulated 50 mS Startup Time Remote ON to Vout regulated 50 mS 50-75-50% load step, settling time to within Dynamic Load Response 180 250 μSec ±2% of Vout Dynamic load di/dt 2 A/μSec Dynamic Load Peak Deviation same as above ±30 ±100 mV FEATURES and OPTIONS Remote On/Off Control ➃ "N" sufŢ x Negative Logic, ON state ON = Ground pin or external voltage -0.7 1.2 V Negative Logic, OFF state OFF = Pin open or external voltage 10 15 V Control Current 1mA "P" sufŢ x Positive Logic, ON state ON = Pin open or external voltage 10 15 V Positive Logic, OFF state OFF = Ground pin or external voltage -0.7 1.2 V Control Current 1mA www.murata-ps.com/support MDC_UEI25W.B10 Page 3 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL UEI25-033-D48 OUTPUT Conditions ➀ ➂ Minimum Typical/Nominal Maximum Units Total Output Power See Derating 0.0 25.0 25.25 W Voltage Nominal Output Voltage No trim 3.267 3.30 3.333 Vdc Setting Accuracy At 50% load -1 +1 % of Vset. Output Voltage Range User-adjustable -10 +10 % of Vnom. Overvoltage Protection Via magnetic feedback 4.2 5 5.7 Vdc Current Output Current Range 0.7575 7.575 7.575 A 10% minimum load % of Iout Minimum Load ➂ Current Limit Inception 98% of Vnom., after warmup 8.5 10 11 A Short Circuit Short Circuit Current Hiccup technique, autorecovery 0.3 A Short Circuit Duration (remove short for Output shorted to ground, no damage Continuous recovery) Short circuit protection method Current limiting Regulation ➄ Line Regulation Vin=min. to max., Vout=nom., 50% load ±0.1 % of Vout Load Regulation Iout=min. to max., Vin=48V ±0.2 % of Vout Ripple and Noise 5 Hz- 20 MHz BW 50 80 mV pk-pk Temperature CoefŢ cient At all outputs 0.02 % of Vnom./°C Maximum Capacitive Loading (10% ceramic, Cap. ESR=<0.02Ω, full resistive load 0 2000 μF 90% Oscon) MECHANICAL (Through Hole Models) Conditions ➀ Minimum Typical/Nominal Maximum Units Outline Dimensions (no baseplate) C75 case 0.9x1.1x0.32 Inches (Please refer to outline drawing) WxLxH 22.86x27.9x8.1 mm Weight 0.32 Ounces 9.07 Grams Through Hole Pin Diameter 0.04 Inches 1.016 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 50 μ-inches Gold overplate 5 μ-inches ENVIRONMENTAL With derating, 200 LFM -40 85 °C Operating Ambient Temperature Range No derating, 200 LFM -40 70 °C Storage Temperature Vin = Zero (no power) -55 125 °C Thermal Protection/Shutdown Measured in center 110 115 120 °C Electromagnetic Interference External fi lter is required Conducted, EN55022/CISPR22 B Class Radiated, EN55022/CISPR22 B Class Relative humidity, non-condensing To +85°C 10 90 %RH Altitude must derate -1%/1000 feet -500 10,000 feet -152 3048 meters RoHS rating RoHS-6 Notes ➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal out- ➂ All models are stable and regulate to specifi cation under minimum (10%) load. put voltage and full load. General conditions are +25˚ Celsius ambient temperature, Operation under no load will not damage the converter but may increase regulation, near sea level altitude, natural convection airfl ow. All models are tested and specifi ed output ripple, and noise. with external parallel 1 μF and 10 μF multi-layer ceramic output capacitors. The ex- ➃ The Remote On/Off Control is referred to -Vin. ternal input capacitor is 4.7 μF ceramic. All capacitors are low-ESR types wired close ➄ Regulation specifi cations describe the output voltage changes as the line voltage or to the converter. These capacitors are necessary for our test equipment and may not load current is varied from its nominal or midpoint value to either extreme. be needed in the user's application. ➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. Input fi ltering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH. www.murata-ps.com/support MDC_UEI25W.B10 Page 4 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS – MODEL UEI25-050-D48 ABSOLUTE MAXIMUM RATINGS Conditions ➀ Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 80 Vdc Operating or non-operating, 100 mS max. Input Voltage, Transient 0 100 Vdc duration Isolation Voltage Input to output 2250 Vdc Input Reverse Polarity None, install external fuse None Vdc On/Off Remote Control Power on or off, referred to -Vin 0 15 Vdc Output Power 0 25.25 W Output Current Current-limited, no damage, short-circuit protected 0 5 A Storage Temperature Range Vin = Zero (no power) -55 125 ˚C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi cations Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 1.5 A Start-up threshold Rising input voltage 34 35 36 Vdc Undervoltage shutdown Falling input voltage 32 33.5 34.5 Vdc Overvoltage shutdown None Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type LC Input current Full Load Conditions Vin = nominal 0.57 0.59 A Low Line Vin = minimum 0.76 0.79 A Inrush Transient 0.05 A2-Sec. Output in Short Circuit 50 100 mA No Load Iout = minimum, unit=ON 30 50 mA Standby Mode (Off, UV, OT) 13 mA Measured at input with specifi ed fi lter 30 mA, RMS Reţ ected (back) ripple current ➁ Pre-biased startup External output voltage < Vset Monotonic GENERAL and SAFETY Vin=48V, full load 89 91 % EfŢ ciency Vin=36V, full load 89 91 % Isolation Isolation Voltage Input to output, continuous 2250 Vdc Insulation Safety Rating basic Isolation Resistance 10 Mohm Isolation Capacitance 2000 pF Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1, Safety Yes IEC/EN60950-1, 2nd edition Per MIL-HDBK-217F, ground benign, 6 Calculated MTBF TBD Hours x 10 Tambient=+30˚C Per Telcordia SR332, issue 1, class 3, ground 6 Calculated MTBF 2 Hours x 10 fi xed, Tambient=+40°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 300 330 360 KHz Startup Time Power On to Vout regulated 50 mS Startup Time Remote ON to Vout regulated 50 mS 50-75-50% load step, settling time to within Dynamic Load Response 200 μSec ±2% of Vout Dynamic load di/dt 2 A/μSec Dynamic Load Peak Deviation same as above ±150 mV FEATURES and OPTIONS Remote On/Off Control ➃ "N" sufŢ x Negative Logic, ON state ON = Ground pin or external voltage -0.7 0.7 V Negative Logic, OFF state OFF = Pin open or external voltage 10 15 V Control Current 1mA "P" sufŢ x Positive Logic, ON state ON = Pin open or external voltage 10 15 V Positive Logic, OFF state OFF = Ground pin or external voltage -0.7 0.8 V Control Current 1mA www.murata-ps.com/support MDC_UEI25W.B10 Page 5 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL UEI25-050-D48 OUTPUT Conditions ➀ ➂ Minimum Typical/Nominal Maximum Units Total Output Power See Derating 0.0 25.0 25.25 W Voltage Nominal Output Voltage No trim 4.95 5.00 5.05 Vdc Setting Accuracy At 50% load -1 +1 % of Vset. Output Voltage Range User-adjustable -10 +10 % of Vnom. Overvoltage Protection Via magnetic feedback 6 6.5 7.5 Vdc Current Output Current Range 0 5.0 5.0 A No minimum load % of Iout Minimum Load ➂ Current Limit Inception 98% of Vnom., after warmup 5.3 6.8 7.3 A Short Circuit Short Circuit Current Hiccup technique, autorecovery 0.3 A Short Circuit Duration (remove short for Output shorted to ground, no damage Continuous recovery) Short circuit protection method Current limiting Regulation ➄ Line Regulation Vin=min. to max., Vout=nom., 50% load ±0.1 % of Vout Load Regulation Iout=min. to max., Vin=48V ±0.2 % of Vout Ripple and Noise 5 Hz- 20 MHz BW 50 80 mV pk-pk Temperature CoefŢ cient At all outputs 0.02 % of Vnom./°C Maximum Capacitive Loading (10% ceramic, Cap. ESR=<0.02Ω, full resistive load 0 2000 μF 90% Oscon) MECHANICAL (Through Hole Models) Conditions ➀ Minimum Typical/Nominal Maximum Units Outline Dimensions (no baseplate) C75 case 0.96x1.1x0.32 Inches (Please refer to outline drawing) WxLxH 24.4x27.9x8.1 mm Weight 0.32 Ounces 9.07 Grams Through Hole Pin Diameter 0.04 Inches 1.016 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 50 μ-inches Gold overplate 5 μ-inches ENVIRONMENTAL With derating, 200 LFM -40 85 °C Operating Ambient Temperature Range No derating, 200 LFM, full power -40 82 °C Operating Case Temperature Range No derating -40 105 °C Storage Temperature Vin = Zero (no power) -55 125 °C Thermal Protection/Shutdown Measured in center 110 115 120 °C Electromagnetic Interference External fi lter is required Conducted, EN55022/CISPR22 B Class Radiated, EN55022/CISPR22 B Class Relative humidity, non-condensing To +85°C 10 90 %RH Altitude must derate -1%/1000 feet -500 10,000 feet -152 3048 meters RoHS rating RoHS-6 Notes ➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal out- ➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. put voltage and full load. General conditions are +25˚ Celsius ambient temperature, Input fi ltering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH. near sea level altitude, natural convection airfl ow. All models are tested and specifi ed with external parallel 1 μF and 10 μF multi-layer ceramic output capacitors. The ex- ➂ All models are stable and regulate to specifi cation under no load. ternal input capacitor is 4.7 μF ceramic. All capacitors are low-ESR types wired close ➃ The Remote On/Off Control is referred to -Vin. to the converter. These capacitors are necessary for our test equipment and may not ➄ Regulation specifi cations describe the output voltage changes as the line voltage or be needed in the user's application. load current is varied from its nominal or midpoint value to either extreme. www.murata-ps.com/support MDC_UEI25W.B10 Page 6 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS – MODEL UEI25-120-D48 ABSOLUTE MAXIMUM RATINGS Conditions ➀ Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 80 Vdc Operating or non-operating, 100 mS max. Input Voltage, Transient 0 100 Vdc duration Isolation Voltage Input to output 2250 Vdc Input Reverse Polarity None, install external fuse None Vdc On/Off Remote Control Power on or off, referred to -Vin 0 15 Vdc Output Power 025W Output Current Current-limited, no damage, short-circuit protected 0 2.1 A Storage Temperature Range Vin = Zero (no power) -55 125 ˚C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi cations Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 1.5 A Start-up threshold Rising input voltage 34 35.2 36 Vdc Undervoltage shutdown Falling input voltage 32 34.0 35.2 Vdc Overvoltage shutdown None Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type capacitive Input current Full Load Conditions Vin = nominal 0.600 0.617 A Low Line Vin = minimum 0.809 0.842 A Inrush Transient 0.05 A2-Sec. Output in Short Circuit 50 100 mA No Load Iout = minimum, unit=ON 20 35 mA Standby Mode (Off, UV, OT) 12 mA Measured at input with specifi ed fi lter 30 mA, RMS Reţ ected (back) ripple current ➁ Pre-biased startup External output voltage < Vset Monotonic GENERAL and SAFETY EfŢ ciency Vin=48V, full load 86.0 87.5 % Isolation Isolation Voltage Input to output, continuous 2250 Vdc Insulation Safety Rating basic Isolation Resistance 10 Mohm Isolation Capacitance 1700 pF Certifi ed to UL-60950-1, CSA-C22.2 No.60950- Safety Yes 1, IEC/EN60950-1 Per MIL-HDBK-217F, ground benign, 6 Calculated MTBF TBD Hours x 10 Tambient=+30˚C Per Telcordia SR332, issue 1, class 3, ground 6 Calculated MTBF 2 Hours x 10 fi xed, Tambient=+40°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 295 325 355 KHz Startup Time Power On to Vout regulated 10 50 mS Startup Time Remote ON to Vout regulated 10 50 mS 50-75-50% load step, settling time to within Dynamic Load Response 100 200 μSec ±1% of Vout Dynamic load di/dt 1 A/μSec Dynamic Load Peak Deviation same as above ±250 ±350 mV FEATURES and OPTIONS Remote On/Off Control ➃ "N" sufŢ x Negative Logic, ON state ON = Ground pin or external voltage -0.7 0.7 V Negative Logic, OFF state OFF = Pin open or external voltage 10 15 V Control Current 1mA "P" sufŢ x Positive Logic, ON state ON = Pin open or external voltage 10 15 V Positive Logic, OFF state OFF = Ground pin or external voltage -0.7 0.8 V Control Current 1mA www.murata-ps.com/support MDC_UEI25W.B10 Page 7 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters FUNCTIONAL SPECIFICATIONS (CONT.) – MODEL UEI25-120-D48 OUTPUT Conditions ➀ ➂ Minimum Typical/Nominal Maximum Units Total Output Power See Derating 0.0 25.2 25.45 W Voltage Nominal Output Voltage No trim 11.88 12.00 12.12 Vdc Setting Accuracy At 50% load -1 +1 % of Vset. Output Voltage Range User-adjustable -10 +10 % of Vnom. Overvoltage Protection Via magnetic feedback 14 19 22 Vdc Current Output Current Range 0.0 2.1 2.1 A No minimum load Minimum Load ➂ Current Limit Inception 97% of Vnom., after warmup 2.3 3 3.4 A Short Circuit Hiccup technique, autorecovery within ±1.25% Short Circuit Current 0.1 A of Vout Short Circuit Duration (remove short for Output shorted to ground, no damage Continuous recovery) Short circuit protection method Current limiting Regulation ➄ Line Regulation Vin=min. to max., Vout=nom., 50% load ±0.075 % of Vout Load Regulation Iout=min. to max., Vin=48V ±0.05 % of Vout Ripple and Noise 5 Hz- 20 MHz BW 95 120 mV pk-pk Temperature CoefŢ cient At all outputs 0.02 % of Vnom./°C Maximum Capacitive Loading (10% ceramic, Cap. ESR=<0.02Ω, full resistive load 0 470 μF 90% Oscon) MECHANICAL (Through Hole Models) Conditions ➀ Minimum Typical/Nominal Maximum Units Outline Dimensions (no baseplate) C75 case 0.96x1.1x0.32 Inches (Please refer to outline drawing) WxLxH 24.38x27.94x8.13 mm Weight 0.32 Ounces 9.07 Grams Through Hole Pin Diameter 0.04 Inches 1.016 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 50 μ-inches Gold overplate 5 μ-inches ENVIRONMENTAL Operating Ambient Temperature Range With derating, 200 LFM -40 85 °C Storage Temperature Vin = Zero (no power) -55 125 °C Thermal Protection/Shutdown Measured at hotspot 130 135 150 °C Electromagnetic Interference External fi lter is required Conducted, EN55022/CISPR22 B Class Radiated, EN55022/CISPR22 B Class Relative humidity, non-condensing To +85°C 10 90 %RH Altitude must derate -1%/1000 feet -500 10,000 feet -152 3048 meters RoHS rating RoHS-6 Notes ➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal out- ➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. put voltage and full load. General conditions are +25˚ Celsius ambient temperature, Input fi ltering is Cbus=220 μF, Cin=33 μF and Lbus=12 μH. near sea level altitude, natural convection airfl ow. All models are tested and specifi ed ➂ All models are stable and regulate to specifi cation under no load. with external parallel 1 μF and 10 μF multi-layer ceramic output capacitors. The ex- ➃ The Remote On/Off Control is referred to -Vin. ternal input capacitor is 4.7 μF ceramic. All capacitors are low-ESR types wired close ➄ Regulation specifi cations describe the output voltage changes as the line voltage or to the converter. These capacitors are necessary for our test equipment and may not load current is varied from its nominal or midpoint value to either extreme. be needed in the user's application. www.murata-ps.com/support MDC_UEI25W.B10 Page 8 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-033-D48 PERFORMANCE DATA Effi ciency vs. Line Voltage and Load Current @ 25°C Maximum Current Temperature Derating @sea level (airfl ow is from input to output) 92 87 82 8 77 72 0.33 to 2.0 m/s (65 to 400 LFM) 67 0.33 m/s (65 LFM) Vin = 36V, 48V, and 60V 62 0.5 m/s (100 0. LFM) Vin = 36V 7 1.0 to 2.0 m/s (200 to 400 (200 to 400 LFM) 57 Vin = 48V Vin = = 75V 52 Vin = 60V 47 Vin = 75V 42 6 37 32 27 22 17 5 30 35 40 45 50 55 60 65 70 75 80 85 12 A A Ambient Temperature (°C) 7 0.2 0.7 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 Load Current (Amps) Thermal image with "hot spot" at full load current with 63°C ambient, air fl owing at minimal rate of 65 LFM. Air is fl owing across the converter from +Vo to -Vo at 48V input. Identifi able and recommended maximum value to be verifi ed in application. On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=7.5A, Cload=0uF, Ta=+25°C., On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=.7575mA, Cload=0uF, Ta=+25°C., ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout www.murata-ps.com/support MDC_UEI25W.B10 Page 9 of 24 EfŢciency (%) Output Current ( ( (Amps) UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-033-D48 PERFORMANCE DATA, CONTINUED On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=7.5A, Cload=2000uF, Ta=+25°C., Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load, Cload= ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout 1 uFb ceramic || 10uF tantalum, Ta=+25°C., ScopeBW=20Mhz) Output Ripple and Noise (Vin=48V, Vout=nom., Iout=7.5A, Cload= 1 uFb ceramic || 10uF Output Ripple and Noise (Vin=48V, Vout=nom., Iout=.7575mA, Cload= 1 uFb ceramic || tantalum, Ta=+25°C., ScopeBW=20Mhz) 10uF tantalum, Ta=+25°C., ScopeBW=20Mhz) www.murata-ps.com/support MDC_UEI25W.B10 Page 10 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-050-D48 PERFORMANCE DATA Effi ciency vs. Line Voltage and Load Current @ 25°C Power Dissipation vs. Load Current @ 25°C 92 3.50 91 90 3.00 89 88 87 Vin = 36V 2.50 86 Vin = 48V 85 Vin = 60V 2.00 84 Vin = 75V 83 82 1.50 81 Vin = 36V 80 Vin = 48V 79 1.00 Vin = 60V 78 Vin = 75V 77 0.50 76 1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 75 Load Current ( ( (Amps) 1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 Load Current (Amps) Maximum Current Temperature Derating @sea level (VIN = 36V, 48V, 60V, and 75V, airfl ow is from pin 1 to pin 3) 5.1 5.0 0.33 to 2.0 m/s (65 to 400 LFM) 4.9 4.8 4.7 4.6 4.5 30 35 40 45 50 55 60 65 70 75 80 85 A A Ambient temperature (°C) Thermal image with "hot spot" at full load current with 80°C ambient, air fl owing at minimal rate of 65 LFM. Air is fl owing across the converter from +Vo to -Vo at 48V input. Identifi able and recommended maximum value to be verifi ed in application. www.murata-ps.com/support MDC_UEI25W.B10 Page 11 of 24 EfŢciency (%) Output Current ( ( (Amps) Loss ( ( (Watts) UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-050-D48 PERFORMANCE DATA, CONTINUED On/Off Enable Delay (Vin=48V, Vout=nom., Iout=no load, Cload=0 μF, Ta=+25°C., On/Off Enable Delay (Vin=48V, Vout=nom., Iout=5A, Cload=0 μF, Ta=+25°C., ScopeBW=20MHz) Trace 1=Enable, Trace 4=Vout ScopeBW=20MHz) Trace 1=Enable, Trace 4=Vout On/Off Enable Delay (Vin=48V, Vout=nom., Iout=5A, Cload=2000 μF, Ta=+25°C., Step Load Transient Response (Vin=48V, Vout=nom., Iout=50-75-50% of full load, Cload=1 ScopeBW=20MHz) Trace 1=Enable, Trace 4=Vout μF ceramic || 10μF tantalum, Ta=+25°C., ScopeBW=20MHz) Output Ripple and Noise (Vin=48V, Vout=nom., Iout=no load, Cload=1 μF ceramic || 10μF Output Ripple and Noise (Vin=48V, Vout=nom., Iout=5A, Cload=1 μF ceramic || 10μF tantalum, Ta=+25°C., ScopeBW=20MHz) tantalum, Ta=+25°C., ScopeBW=20MHz) www.murata-ps.com/support MDC_UEI25W.B10 Page 12 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-120-D48 PERFORMANCE DATA Effi ciency vs. Line Voltage and Load Current @ 25°C Power Dissipation vs. Load Current @ 25°C 89 4.46 88 3.96 87 3.46 86 2.96 85 Vin = 36V Vin = 48V 84 2.46 Vin = 60V 83 Vin = 75V 1.96 Vin = 36V 82 Vin = 48V 1.46 Vin = 60V 81 Vin = 75V 0.96 80 79 0.46 0.4 0.6 0.8 0.9 1.1 1.3 1.4 1.6 1.8 1.9 2.1 78 Load Current ( ( (Amps) 0.4 0.6 0.8 0.9 1.1 1.3 1.4 1.6 1.8 1.9 2.1 Load Current (Amps) Maximum Current Temperature Derating @sea level Maximum Current Temperature Derating @sea level (VIN = 36V, airfl ow is from pin 1 to pin 3) (VIN = 48V, airfl ow is from pin 1 to pin 3) 2.25 2.2 2.175 2.2 2.15 2.15 0.33 m/s (65 LFM) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 2.125 2.1 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 2.1 1.5 m/s (300 ( LFM) ) 2.05 2.075 2.0 2.05 1.95 2.025 1.9 2 65 70 75 80 85 65 70 75 80 85 A A Ambient temperature (°C) A A Ambient temperature (°C) Maximum Current Temperature Derating @sea level Thermal image with "hot spot" at full load current with 65°C ambient, air fl owing at (VIN = 60V, airfl ow is from pin 1 to pin 3) minimal rate of 65 LFM. Air is fl owing across the converter from +Vo to -Vo at 48V input. Identifi able and recommended maximum value to be verifi ed in application. 2.2 2.175 2.15 0.33 m/s (65 LFM) 2.125 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 2.1 2.075 2.05 2.025 2 65 70 75 80 85 A A Ambient temperature (°C) www.murata-ps.com/support MDC_UEI25W.B10 Page 13 of 24 Output Current ( ( (Amps) Output Current ( ( (Amps) EfŢciency (%) Output Current ( ( (Amps) Loss ( ( (Watts) UEI25 Series Single Output Isolated 25-Watt DC/DC Converters UEI25-120-D48 PERFORMANCE DATA, CONTINUED Maximum Current Temperature Derating @sea level On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=0A, Cload=0uF, Ta=+25°C., (VIN = 75V, airfl ow is from pin 1 to pin 3) ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout 2.2 2.15 2.1 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 2.05 1.0 m/s (200 LFM) 1.5 m/s (300 ( LFM) ) 1.95 1.9 65 70 75 80 85 A A Ambient temperature (°C) On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=2.1A, Cload=0uF, Ta=+25°C., On/Off ENABLE DELAY (Vin=48, Vout=nom, Iout=2.1A, Cload=2000uF, Ta=+25°C., ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout ScopeBW=20Mhz) Trace 1= Enable. Trace 4=Vout Stepload Transient Response (Vin = 48V, Iout = 25-75-25% of Imax, Cout = 1&10μF, Output Ripple and Noise (Vin=48V, Iout = 2.1A, Cout = 1&10μF, Ta = +25°C, Ta = +25°C, Scope BW = 20MHz) Scope BW = 20MHz) www.murata-ps.com/support MDC_UEI25W.B10 Page 14 of 24 Output Current ( ( (Amps) UEI25 Series Single Output Isolated 25-Watt DC/DC Converters MECHANICAL SPECIFICATIONS, OPEN FRAME THROUGH-HOLE MOUNT Dimensions are in inches (mm shown for ref. only). Third Angle Projection Case 75 24.4 Tolerances (unless otherwise specified): 0.96 .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) PIN #1 Angles ± 1˚ Components are shown for reference only. 27.9 INPUT/OUTPUT CONNECTIONS 1.10 Pin Function P85 1 +Vin TOP VIEW 2 -Vin 3 +Vout 4 Output Trim 5 -Vout SIDE VIEW MOUNTING 6 On/Off Control* PLANE *The Remote On/Off can be provided 8.1 with either positive (P sufŢ x) or nega- 0.32 MAX tive (N sufŢ x) logic These converters are plug-compatible to competitive units. In case of pinout numbering .040±.002 PIN DIAMETER inconsistency, follow the pin FUNCTION, not .071 .002 SHOULDER DIAMETER the pin number when laying out your PC board. 6X AT PINS 1-6 BOTTOM VIEW END VIEW 20.32 0.475 0.800 [12.07] 0.58 REF [14.7] RECOMMENDED PRI-SEC BARRIER 0.15 TYP 2.54 [3.8] 0.100 0.41 10.16 [10.4] 0.400 #3 C C L L 5.08 10.16 0.200 #1 #4 0.400 6.3 #2 0.30 0.25 [7.62] #5 10.16 0.400 #6 C L Standard pin length is shown. Please refer to the Ordering Guide for alternate pin lengths. www.murata-ps.com/support MDC_UEI25W.B10 Page 15 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT Anti-static foam Label Label Each tray is 6 x 5 units (30 units per tray) SHIPPING TRAY DIMENSIONS UEI modules are supplied in a 30-piece (6 x 5) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are shown below. [9.92] 252.0 6.4 Typ 6.4 28.4 18.0 Typ Typ 5x 38.1 25.4 252.0 Typ 252.0 [9.92] Ref 190.5 Ref Ref 252.0 R 6.4 A A Typ 9.5 deep 4x 44.5 19.1 Ref 177.8 Ref 22.9 Ref 9.5 [.38 in] Pocket 19.1 [.75 in] Depth SECTION A-A Notes: 1. Material: Dow 220 antistat ethafoam (Density: 34-35 kg/m3) 2. Dimensions: 252 x 252 x 19.1 mm 6 x 5 array (30 per tray) 3. All dimensions in millimeters [inches] 4. Tolerances unless otherwise specified: +1/-0 www.murata-ps.com/support MDC_UEI25W.B10 Page 16 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL RATING 2) Dimensions are in inches (mm shown for ref. only). Third Angle Projection Case 75 TOP VIEW PIN #1 Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) 24.4 .XXX ± 0.010 (0.25) 0.96 Angles ± 1˚ Components are shown for reference only. INPUT/OUTPUT CONNECTIONS Pin Function P85 1 +Vin 27.9 2 -Vin 1.10 3 +Vout 4 Output Trim 5 -Vout SIDE VIEW 6 On/Off Control* *The Remote On/Off can be provided MOUNTING with either positive (P sufŢ x) or nega- PLANE tive (N sufŢ x) logic These converters are plug-compatible to competitive units. In case of pinout numbering 0.093 [2.4] TYP inconsistency, follow the pin FUNCTION, not the pin number when laying out your PC board. BOTTOM VIEW END VIEW 20.32 0.800 0.58 [14.7] 0.34 RECOMMENDED [8.64] PRI-SEC BARRIER 0.15 TYP 2.54 MAX [3.8] 0.100 0.41 10.16 [10.4] 0.400 #3 C C L L 5.08 0.093 10.16 0.200 [2.4] #1 #4 0.400 #2 0.30 [7.62] 10.16 #5 0.13 [3.3] REF 0.400 #6 C L www.murata-ps.com/support MDC_UEI25W.B10 Page 17 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters RECOMMENDED SMT PAD LAYOUT [20.32] 0.800 [2.60 ±0.25] 6X .102 ±.010 INPUT/OUTPUT CONNECTIONS 6 5 [2.54] Pin Function P85 0.100 1 +Vin [10.16] 2 -Vin 0.400 2 4 3 +Vout C [25.4] L 4 Output Trim 1.00 1 5 -Vout [10.16] 6 On/Off Control* [2.54] 0.400 0.100 3 *The Remote On/Off can be provided with either positive (P sufŢ x) or nega- tive (N sufŢ x) logic C L [29.0] 1.14 SURFACE MOUNT TAPE AND REEL INFORMATION (MSL RATING 2) PACKAGING CONFORMS TO EIA-481 CONVERTERS SHIPPING IN QUANTITIES OF 100 PER REEL NOTE: The SMT package has an MSL 2 rating. 3.00 5.0mm Nozzle Pick & 2.00 0.118 Place Location 0.079 23.10 0.909 56.0 2.20 32.00 1.260 Feed (unwind) direction Pitch 13.0 Cover Tape R.256 9.27 0.365 Dimensions in inches [mm] www.murata-ps.com/support MDC_UEI25W.B10 Page 18 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters all applications, some experimentation may be needed. Note that external input TECHNICAL NOTES capacitors must accept high speed switching currents. Input Fusing Because of the switching nature of DC/DC converters, the input of these Certain applications and/or safety agencies may require fuses at the inputs of converters must be driven from a source with both low AC impedance and power conversion components. Fuses should also be used when there is the adequate DC input regulation. Performance will degrade with increasing input possibility of sustained input voltage reversal which is not current-limited. For inductance. Excessive input inductance may inhibit operation. The DC input greatest safety, we recommend a fast blow fuse installed in the ungrounded regulation specifi es that the input voltage, once operating, must never degrade input supply line. below the Shut-Down Threshold under all load conditions. Be sure to use The installer must observe all relevant safety standards and regulations. For adequate trace sizes and mount components close to the converter. safety agency approvals, install the converter in compliance with the end-user safety standard. I/O Filtering, Input Ripple Current and Output Noise All models in this converter series are tested and specifi ed for input refl ected Input Reverse-Polarity Protection ripple current and output noise using designated external input/output compo- If the input voltage polarity is reversed, an internal diode will become forward nents, circuits and layout as shown in the fi gures below. External input capaci- biased and likely draw excessive current from the power source. If this source tors (CIN in the fi gure) serve primarily as energy storage elements, minimizing is not current-limited or the circuit appropriately fused, it could cause perma- line voltage variations caused by transient IR drops in the input conductors. nent damage to the converter. Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the fi gure below, Input Under-Voltage Shutdown and Start-Up Threshold the CBUS and LBUS components simulate a typical DC voltage bus. Your specifi c Under normal start-up conditions, converters will not begin to regulate properly system confi guration may require additional considerations. Please note that the until the rising input voltage exceeds and remains at the Start-Up Threshold values of CIN, LBUS and CBUS may vary according to the specifi c converter model. Voltage (see Specifi cations). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent TO restart will not occur until the input voltage rises again above the Start-Up CURRENT OSCILLOSCOPE Threshold. This built-in hysteresis prevents any unstable on/off operation at a PROBE 1 +VIN single input voltage. LBUS + Users should be aware however of input sources near the Under-Voltage – VIN CBUS CIN Shutdown whose voltage decays as input current is consumed (such as capacitor + – inputs), the converter shuts off and then restarts as the external capacitor re- 2 charges. Such situations could oscillate. To prevent this, make sure the operating −VIN input voltage is well above the UV Shutdown voltage AT ALL TIMES. CIN = 33μF, ESR < 700mΩ @ 100kHz CBUS = 220μF, ESR < 100mΩ @ 100kHz Start-Up Delay LBUS = 12μH Assuming that the output current is set at the rated maximum, the Vin to Vout Start- Figure 2. Measuring Input Ripple Current Up Delay (see Specifi cations) is the time interval between the point when the rising input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specifi ed regulation band. Actual measured In critical applications, output ripple and noise (also referred to as periodic times will vary with input source impedance, external input capacitance, input volt- and random deviations or PARD) may be reduced by adding fi lter elements age slew rate and fi nal value of the input voltage as it appears at the converter. such as multiple external capacitors. Be sure to calculate component tempera- ture rise from refl ected AC current dissipated inside capacitor ESR. These converters include a soft start circuit to moderate the duty cycle of the PWM controller at power up, thereby limiting the input inrush current. Floating Outputs Since these are isolated DC/DC converters, their outputs are “fl oating” with The On/Off Remote Control interval from inception to VOUT regulated as- respect to their input. The essential feature of such isolation is ideal ZERO sumes that the converter already has its input voltage stabilized above the CURRENT FLOW between input and output. Real-world converters however do Start-Up Threshold before the On command. The interval is measured from the exhibit tiny leakage currents between input and output (see Specifi cations). On command until the output enters and remains within its specifi ed regulation These leakages consist of both an AC stray capacitance coupling component band. The specifi cation assumes that the output is fully loaded at maximum and a DC leakage resistance. When using the isolation feature, do not allow rated current. the isolation voltage to exceed specifi cations. Otherwise the converter may Input Source Impedance be damaged. Designers will normally use the negative output (-Output) as These converters will operate to specifi cations without external components, the ground return of the load circuit. You can however use the positive output assuming that the source voltage has very low impedance and reasonable in- (+Output) as the ground return to effectively reverse the output polarity. put voltage regulation. Since real-world voltage sources have fi nite impedance, performance is improved by adding external fi lter components. Sometimes only a small ceramic capacitor is suffi cient. Since it is diffi cult to totally characterize www.murata-ps.com/support MDC_UEI25W.B10 Page 19 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters CAUTION: If you exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected near Sea Level altitude. Be sure to reduce the derating for higher altitude. +VOUT Output Overvoltage Protection (OVP) SCOPE RLOAD C1 C2 This converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. The signal is optically coupled to the pri- −VOUT mary side PWM controller. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output volt- age to ramp up to its rated value. It is not necessary to power down and reset C1 = 1μF the converter for this automatic OVP-recovery restart. C2 = 10μF LOAD 2-3 INCHES (51-76mm) FROM MODULE If the fault condition persists and the output voltage climbs to excessive Figure 3. Measuring Output Ripple and Noise (PARD) levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to as “hiccup” mode. Minimum Output Loading Requirements Output Fusing These converters employ a synchronous rectifi er design topology. All models The converter is extensively protected against current, voltage and temperature regulate within specifi cation and are stable from 0% load to full load conditions, extremes. However, your application circuit may need additional protection. In the unless otherwise specifi ed. Operation under no load will not damage the con- extremely unlikely event of output circuit failure, excessive voltage could be applied verter but might, however, slightly increase regulation, output ripple, and noise. to your circuit. Consider using an appropriate external protection. Thermal Shutdown Output Current Limiting To protect against thermal over-stress, these converters include thermal shut- As soon as the output current increases to approximately its overcurrent limit, down circuitry. If environmental conditions cause the temperature of the DC/ the DC/DC converter will enter a current-limiting mode. The output voltage will DC’s to rise above the Operating Temperature Range up to the shutdown tem- decrease proportionally with increases in output current, thereby maintaining a perature, an on-board electronic temperature sensor will power down the unit. somewhat constant power output. This is commonly referred to as power limiting. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent Current limiting inception is defi ned as the point at which full power falls rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the below the rated tolerance. See the Performance/Functional Specifi cations. converter may shut down suddenly without warning. Be sure to thoroughly test Note particularly that the output current may briefl y rise above its rated value. your application to avoid unplanned thermal shutdown. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Temperature Derating Curves The graphs in the performance data section illustrate typical operation under a Output Short Circuit Condition variety of conditions. The Derating curves show the maximum continuous ambient When a converter is in current-limit mode, the output voltage will drop as air temperature and decreasing maximum output current which is acceptable under the output current demand increases. If the output voltage drops too low, the increasing forced airfl ow measured in Linear Feet per Minute (“LFM”). Note that magnetically coupled voltage used to develop PWM bias voltage will also drop, these are AVERAGE measurements. The converter will accept brief increases in tem- thereby shutting down the PWM controller. Following a time-out period, the perature and/or current or reduced airfl ow as long as the average is not exceeded. PWM will restart, causing the output voltage to begin rising to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initi- Note that the temperatures are of the ambient airfl ow, not the converter it- ate. This on/off cycling is called “hiccup mode.” The hiccup cycling reduces the self which is obviously running at higher temperature than the outside air. Also average output current, thereby preventing excessive internal temperatures. note that “natural convection” is defi ned as very low fl ow rates which are not using fan-forced airfl ow. Depending on the application, “natural convection” is Trimming the Output Voltage usually about 30-65 LFM but is not equal to still air (0 LFM). The Trim input to the converter allows the user to adjust the output voltage over the rated trim range (please refer to the Specifi cations). In the trim equations Murata Power Solutions makes Characterization measurements in a closed and circuit diagrams that follow, trim adjustments use a single fi xed resistor cycle wind tunnel with calibrated airfl ow. We use both thermocouples and an connected between the Trim input and either Vout pin. Trimming resistors should infrared camera system to observe thermal performance. As a practical matter, have a low temperature coeffi cient (±100 ppm/°C or less) and be mounted close it is quite diffi cult to insert an anemometer to precisely measure airfl ow in to the converter. Keep leads short. If the trim function is not used, leave the trim most applications. Sometimes it is possible to estimate the effective airfl ow if unconnected. With no trim, the converter will exhibit its specifi ed output voltage you thoroughly understand the enclosure geometry, entry/exit orifi ce areas and accuracy. the fan fl owrate specifi cations. www.murata-ps.com/support MDC_UEI25W.B10 Page 20 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters There are two CAUTIONs to observe for the Trim input: There are two CAUTIONs for the On/Off Control: CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the CAUTION: While it is possible to control the On/Off with external logic if you maximum output voltage OR the maximum output power when setting the trim. carefully observe the voltage levels, the preferred circuit is either an open If the output voltage is excessive, the OVP circuit may inadvertantly shut down drain/open collector transistor or a relay (which can thereupon be controlled by the converter. If the maximum power is exceeded, the converter may enter logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state, current limiting. If the power is exceeded for an extended period, the converter assuming positive logic. may overheat and encounter overtemperature shut down. CAUTION: Do not apply voltages to the On/Off pin when there is no input CAUTION: Be careful of external electrical noise. The Trim input is a senstive power voltage. Otherwise the converter may be permanently damaged. input to the converter’s feedback control loop. Excessive electrical noise may cause instability or oscillation. Keep external connections short to the Trim input. Use shielding if needed. +VOUT +VIN Trim Equations Trim Up Trim Down ON/OFF UEI25-033-D48 TRIM LOAD CONTROL RTRIM DOWN 12775 5110 x (Vo –2.5) – 2050 RT (Ω) = – 2050 RT (Ω) = UP DOWN 3.3 – VO VO – 3.3 −VOUT −VIN UEI25-050-D48 5110 x (Vo –2.5) 12775 – 2050 RT (Ω) = – 2050 RT (Ω) = Figure 4. Trim adjustments to decrease Output Voltage using a Fixed Resistor UP DOWN VO – 5 5 – VO UEI25-120-D48 +VOUT +VIN 25000 10000 (Vo-2.5) – 5110 RT (Ω) = – 5110 RT (Ω) = UP DOWN 12 – VO VO – 12 ON/OFF TRIM LOAD between Trim and +Vout> Where Vo = Desired output voltage. Adjustment accuracy is subject to resis- tor tolerances and factory-adjusted output accuracy. Mount trim resistor close −VIN −VOUT to converter. Use short leads. Figure 5. Trim adjustments to increase Output Voltage using a Fixed Resistor Remote On/Off Control On the input side, a remote On/Off Control can be specifi ed with either positive or negative logic as follows: +VCC Positive: Models equipped with Positive Logic are enabled when the On/Off pin is left open or is pulled high to +15VDC with respect to –VIN. An internal bias current causes the open pin to rise to +VIN. Positive-logic devices are disabled ON/OFF CONTROL when the On/Off is grounded or brought to within a low voltage (see Specifi ca- tions) with respect to –VIN. -VIN Negative: Models with negative logic are on (enabled) when the On/Off is grounded or brought to within a low voltage (see Specifi cations) with respect to –VIN. The device is off (disabled) when the On/Off is left open or is pulled high to +15VDC Max. with respect to –VIN. Figure 6. Driving the On/Off Control Pin (suggested circuit) Dynamic control of the On/Off function should be able to sink the specifi ed signal current when brought low and withstand specifi ed voltage when brought high. Be aware too that there is a fi nite time in milliseconds (see Specifi cations) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. www.murata-ps.com/support MDC_UEI25W.B10 Page 21 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters dBμV QP AV Emissions Performance 100 Murata Power Solutions measures its products for radio frequency emissions 90 80 against the EN 55022 and CISPR 22 standards. Passive resistance loads are 70 employed and the output is set to the maximum voltage. If you set up your 60 own emissions testing, make sure the output load is rated at continuous power 50 while doing the tests. 40 30 The recommended external input and output capacitors (if required) are 20 included. Please refer to the fundamental switching frequency. All of this 10 information is listed in the Product Specifi cations. An external discrete fi lter is 0 0.15 1.0 10.0 30.0 installed and the circuit diagram is shown below. MHz Graph 2. Conducted emissions performance with fi lter, Negative Line, CISPR 22, Class B, full load, for UEI25-050-D48NM-C Test Card Resistive Load C4 L2 UUT DC Source V+ Resistive Load inside a metal dBμV QP Average 100 container Black Vin+ Vout+ C1 C2 C3 C6 L1 90 80 V- Vin- Vout- 70 60 50 40 C5 30 20 Figure 7. Conducted Emissions Test Circuit 10 0 0.15 1.0 10.0 30.0 [1] Conducted Emissions Parts List MHz Graph 3. Conducted emissions performance without fi lter, Negative Line, CISPR 22, Class Reference Part Number Description Vendor B, full load, for UEI25-050-D48NM-C L1 PE-62913 1mH,6A Pulse L2 NC 4.7uH,3.6A Murata C1, C2 VZ Series Electrolytic Capacitor 22ufd, 100V Panasonic dBμV QP AV C3 VZ Series Qty 2 - Electrolytic Capacitor 22ufd, 100V Panasonic 100 C4, C5 Unknown 3.3nF, 1500V Unknown 90 C6 VZ Series Electrolytic Capacitor 22ufd, 100V Panasonic 80 70 [2] Conducted Emissions Test Equipment Used 60 50  Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC 40  Rohde & Schwarz Software ESPC-1 Ver. 2.20 30 20  OHMITE 25W – 1 Ohm resistor combinations 10  DC Source Programmable DC Power Supply Model 62012P-100-50 0 0.15 1.0 10.0 30.0 MHz [3] Conducted Emissions Test Results Graph 4. Conducted emissions performance with fi lter, Negative Line, CISPR 22, Class B, full load, for UEI25-120-D48P-C dBμV QP AV 100 90 80 70 [4] Layout Recommendations 60 50 Most applications can use the fi ltering which is already installed inside the 40 converter or with the addition of the recommended external capacitors. For 30 greater emissions suppression, consider additional fi lter components and/or 20 shielding. Emissions performance will depend on the user’s PC board layout, 10 the chassis shielding environment and choice of external components. 0 0.15 1.0 10.0 30.0 MHz Since many factors affect both the amplitude and spectra of emissions, we Graph 1. Conducted emissions performance with fi lter, Negative Line, CISPR 22, Class B, recommend using an engineer who is experienced at emissions suppression. full load, for UEI25-033-D48PM-C www.murata-ps.com/support MDC_UEI25W.B10 Page 22 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters Vertical Wind Tunnel Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airfl ow and heat dissipation analysis of power products. IR Transparent The system includes a precision low fl ow-rate anemometer, optical window Variable variable speed fan, power supply input and load controls, Unit under speed fan temperature gauges, and adjustable heating element. test (UUT) The IR camera monitors the thermal performance of the IR Video Unit Under Test (UUT) under static steady-state conditions. A Camera special optical port is used which is transparent to infrared wavelengths. Both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse Heating airfl ow studies are possible by rotation of this carrier board element since there are often signifi cant differences in the heat Precision dissipation in the two airfl ow directions. The combination of low-rate adjustable airfl ow, adjustable ambient heat, and adjustable anemometer Input/Output currents and voltages mean that a very wide 3” below UUT range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent Ambient to the UUT by minimizing airfl ow turbulence. Such turbu- temperature lence infl uences the effective heat transfer characteristics sensor and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly Airflow causing uneven overheating. collimator Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and fan, built-in temperature gauges, and no-contact IR camera mean Figure 8. Vertical Wind Tunnel that power supplies are tested in real-world conditions. www.murata-ps.com/support MDC_UEI25W.B10 Page 23 of 24 UEI25 Series Single Output Isolated 25-Watt DC/DC Converters Through-hole Soldering Guidelines SMT Reţ ow Soldering Guidelines Murata Power Solutions recommends the TH soldering specifi cations below when install- The surface-mount refl ow solder profi le shown below is suitable for SAC305 type lead- ing these converters. These specifi cations vary depending on the solder type. Exceeding free solders. This graph should be used only as a guideline. Many other factors infl uence these specifi cations may cause damage to the product. Your production environment may the success of SMT refl ow soldering. Since your production environment may differ, please thoroughly review these guidelines with your process engineers. differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: Maximum Preheat Temperature 115° C. Maximum Pot Temperature 270° C. Maximum Solder Dwell Time 7 seconds For Sn/Pb based solders: Maximum Preheat Temperature 105° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 6 seconds This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 129 Flanders Road, Westborough, MA 01581 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2018 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_UEI25W.B10 Page 24 of 24