MURATA POWER SOLUTIONS PAH-28/12.5-D48PB-C

PAH-28 Vout, 350-Watt Series www.murata-ps.com Isolated, 350-Watt, Half-Brick DC-DC Converters Output (V) Current (A) Input Voltage (V) 28 12.5 18-36 or 36-75 T Typical unit ypical unit FEATURES PRODUCT OVERVIEW  For applications requiring improved electrical and The module provides a 28Vdc output at 12.5 Amps 28Vout @ 12.5A (350W) thermal performance, consider Murata’s new PAH and accepts a wide input voltage range of 18-36 or  Trimmable 16.8 Vout to 32.2 Vout @ 350W series “Half Brick” DC-DC power converters. These 36-75 Vdc. The PAH topology offers high effi ciency with Vin = 18-36V (D24) or 36-75V (D48) compact modules measure 2.3" X 2.4" X 0.5" (58 (up to 93%), tight line and load regulation, low ripple/  Industry Standard “Half Brick” package noise, and a fast dynamic load response. A single- X 61 X 12.7mm) and offer the industry-standard  High Effi ciency: up to 93% board, highly optimized thermal design contributes to Half Brick footprint.  Outstanding thermal performance the superior thermal performance. The PAH Series is ideal for power amplifi er  Standard baseplate for conduction cooled These half-bricks provide output trim, sense applications, wireless networks, and telecom applications pins, and primary side on/off control. Standard fea- applications. The baseplate provides a means for  No output reverse conduction tures also include input under-voltage shutdown, conduction cooling in demanding thermal environ- output over-voltage protection, output short-circuit/ ment conditions.  Input to Output Isolation, 2250Vdc (Basic) current limiting protection, and thermal shutdown.  Input under-voltage lockout  On/Off Control (Positive or Negative Logic)  Output over-voltage protection  Thermal shutdown  Output short circuit protection (hiccup technique)  Certifi ed to UL/EN 60950-1, CSA-C22.2 No. 60950-1, 2nd edition safety approvals F1 +Vin +Vout Barrier Case ground External DC NOTE: A minimum of 470µF Controller Power of capacitance is required and Power Source on the output to ensure Cout stable operation. An ESR equal to or less than 0.02Ω Open = On is also required. On/Off Reference and Control Error Amplifier Trim logic) -Vin -Vout Figure 1. Simplifi ed Schematic Typical topology is shown. Some models may vary slightly. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 1 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input Efficiency IOUT IIN, no IIN, full Power R/N (mV pk-pk) Regulation (Max.) VOUT VIN Nom. Range Dimensions (Amps, load load (Volts) (Volts) (Volts) Root Model ➀ (Watts) Typ. Max. Line Load Min. Typ. (inches) Max.) (mA) (Amps) PAH-28/12.5-D24 28 12.5 350 75 200 ±0.125% ±0.25% 24 18-36 80 15.7 91% 92.5% 2.3 x 2.4 x 0.5 PAH-28/12.5-D48 28 12.5 350 100 300 ±0.25% ±0.25% 48 36-75 80 7.84 91.5% 93% 2.3 x 2.4 x 0.5 ➀ Please refer to the part number structure for additional ordering part numbers and options. ➂ Full power continuous output requires baseplate installation. Please refer to the derating curves. ➁ All specifications are at nominal line voltage and full load, +25°C. unless otherwise noted. See detailed specifications. PART NUMBER STRUCTURE PAH - 28 / 12.5 D48 N Bx H Lx C - - Power Amplifier RoHS Hazardous Materials compliance Half-Brick C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder Nominal Output Voltage Pin length option Blank = standard pin length 0.180 in. (4.57 mm) Maximum Output Current L1 = 0.110 in. (2.79 mm)* in Amps L2 = 0.145 in. (3.68 mm)* *Minimum order quantity is required. Input Voltage Range: Conformal coating (optional) Samples available with standard pin D24 = 18-36 Volts (24V nominal) Blank = no coating, standard length only. D48 = 36-75 Volts (48V nominal) H = Coating added* Baseplate (installed on all models) On/Off Control Logic B = Baseplate installed with standard M3-12.7 threaded rivet (typ. 4) Note: N = Negative logic B1 = Baseplate installed with unthreaded insert Some model number combinations may P = Positive logic not be available. See website or contact (see Mechanical section for details). your local Murata sales representative. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 2 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D24 ABSOLUTE MAXIMUM RATINGS Conditions Minimum Typical/Nominal Maximum Units Input Voltage, Continuous 0 36 Vdc Input Voltage, Transient 100 mS max. duration 50 Vdc Isolation Voltage Input to output 2250 Vdc On/Off Remote Control Power on, referred to -Vin 0 13.5 Vdc Output Power 0 357 W Current-limited, no damage, short-circuit Output Current 0 12.5 A protected 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 Specifications Table is not implied nor recommended. INPUT Operating voltage range 18 24 36 Vdc Start-up threshold 14.5 16.5 Vdc Undervoltage shutdown 11.5 14 Vdc Internal Filter Type Pi Vdc External Input fuse 35 A Input current Full Load Conditions Vin = nominal 15.77 16.26 A Low Line input current Vin = minimum 22 A 2 Inrush Transient Vin = 24V. 1 A -Sec. Short Circuit input current 0.03 0.10 A No Load input current Iout = minimum, unit=ON 80 100 mA Shut-Down input currrent(Off, UV, OT) 5 15 mA Back Ripple Current 80 120 mA, pk-pk GENERAL and SAFETY Efficiency Vin=24V, full load 91 92.5 % Isolation Input to output 2250 Vdc Isolation Voltage Input to Baseplate 1500 Vdc Output to Baseplate 1500 Vdc Insulation Safety Rating Basic Isolation Resistance 10 MΩ Isolation Capacitance 1500 pF Certified to UL-60950-1, CSA-C22.2 No.60950- Safety Pending 1, IEC/EN60950-1, 2nd edition (pending) Per Telcordia SR-332, Issue 2, Method 1, Class 3 Calculated MTBF 1200 Hours x 10 1, Ground Fixed, Tcase=+25°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 300 KHz Turn On Time Startup Delay Vin On to 10% Vout or Remote On to 10% Vout 25 35 mS Rise Time 10% Vout to 90% Vout 28 35 mS Vout Rise Time From 0%~100% 28 35 mS Dynamic Load Response 50-75-50%, 1A/µs,within 1% of Vout 100 µSec Dynamic Load Peak Deviation same as above ±200 ±400 mV FEATURES and OPTIONS Remote On/Off Control “P” suffix: Positive Logic, ON state ON = pin open or external voltage 3.5 13.5 V Positive Logic, OFF state OFF = ground pin or external voltage 0 1 V Control Current open collector/drain 1 2 mA “N” suffix: Negative Logic, ON state ON = ground pin or external voltage -0.1 0.8 V Negative Logic, OFF state OFF = pin open or external voltage 2.5 13.5 V Control Current open collector/drain 1 2 mA Sense pins connected externally to respective Remote Sense Compliance 2 % of Vout Vout pins www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 3 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D24 (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 350 357 W Voltage Setting Accuracy At 100% load, no trim, all conditions 27.44 28 28.56 Vdc Output Adjust Range 16.8 32.2 Vdc Overvoltage Protection 34 34.6 37 Vdc Current Output Current Range 0 12.5 12.5 A Minimum Load No minimum load Current Limit Inception ➃ 98% of Vnom., cold 14 16 19 A Short Circuit Hiccup technique, Short Circuit Current 0.03 A autorecovery within ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method Hiccup current limiting Non-latching Regulation ➄ Line Regulation Vin = 18-36, Vout = nom., full load ±0.125 % Load Regulation Iout = min. to max., Vin = nom. ±0.25 % Ripple and Noise 20 MHz BW, Cout = 1µF paralleled with 10µF 75 200 mV pk-pk Temperature Coefficient At all outputs 0.02 % of Vnom./°C (Loads : CR mode) 470 3,300 μF Maximum Output Capacitance (Loads : CC mode) 470 2,200 μF MECHANICAL Outline Dimensions with baseplate; see mechanical drawings 2.3 x 2.4 x 0.5 Inches 58.4 x 60.96 x 12.7 mm Weight 3.42 Ounces 97 Grams Through Hole Pin Diameter Pins 1–4, 6–8/5,9 0.04/0.08 Inches 1.016/2.032 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 100-299 µ-inches Gold overplate 10.31 µ-inches ENVIRONMENTAL Operating Ambient Temperature Range with derating -40 85 ˚C Operating Baseplate Temperature -40 115 ˚C Storage Temperature Vin = Zero (no power) -55 125 ˚C Thermal Protection/Shutdown 115 125 130 ˚C (with "B" Suffix) Electromagnetic Interference External filter required; B Class Conducted, EN55022/CISPR22 see emissions performance test. RoHS rating RoHS-6 www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 4 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Efficiency and Power Dissipation 96 32 92 28 88 24 VIN = 36V 84 VIN = 24V 20 VIN = 18V 80 16 76 12 Power Dissipation VIN = 24V 72 8 68 4 64 0 0.5 1.7 2.9 4.1 5.3 6.5 7.7 8.9 10.1 11.3 12.5 Iout (Amps) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 5 of 21 Efficiency (%) Dissipation (Watts) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Transverse Longitudinal Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=18V, airflow from Vin- to Vout+, open frame) (Vin=18V, airflow from Vin to Vout, open frame) 14 14 12 12 10 10 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 0.5 m/s (100 LFM) 1.5 m/s (300 LFM) 8 8 1.0 m/s (200 LFM) 2.0 m/s (400 LFM) 1.5 m/s (300 LFM) 6 2.0 m/s (400 LFM) 6 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=24V, airflow from Vin- to Vout+, open frame) (Vin=24V, airflow from Vin to Vout, open frame) 14 14 12 12 10 10 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 8 8 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 6 6 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=36V, airflow from Vin- to Vout+, open frame) (Vin=36V, airflow from Vin to Vout, open frame) 14 14 12 12 10 10 8 8 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 6 1.5 m/s (300 LFM) 6 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 6 of 21 Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Transverse Longitudinal Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=18V, airflow from Vin- to Vout+, with baseplate) (Vin=18V, airflow from Vin to Vout, with baseplate) 14 14 12 12 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 10 10 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 8 8 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 6 6 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=24V, airflow from Vin- to Vout+, with baseplate) (Vin=24V, airflow from Vin to Vout, with baseplate) 14 14 12 12 10 10 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 8 8 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 6 6 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=36V, airflow from Vin- to Vout+, with baseplate) (Vin=36V, airflow from Vin to Vout, with baseplate) 14 14 12 12 10 10 0.5 m/s (100 LFM) 8 8 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 6 6 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 7 of 21 Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D48 ABSOLUTE MAXIMUM RATINGS Conditions ➀ Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 80 Vdc Operating or non-operating, tested: Input Voltage, Transient 0 100 Vdc 100 mS max. 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 0 350 355.25 W Current-limited, no damage, Output Current 0 12.5 A short-circuit protected 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 Specifications Table is not implied nor recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 20 A Turn On/Start-up threshold tested at 1/2 load Rising input voltage 33 34 35 Vdc Turn Off/Undervoltage lockout tested at 1/2 load Falling input voltage 31 32 33 Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type Pi Input current Full Load Conditions Vin = nominal 7.84 8.04 A Low Line Vin = minimum 10.57 10.84 A 2 Inrush Transient 2.5 5 A -Sec. Output in Short Circuit 60 100 mA No Load Input Current Iout = minimum, unit=ON 80 100 mA Shut-Down Mode Input Current 5 10 mA Reflected (back) ripple current ➁ Measured at input with specified filter 40 80 mA, pk-pk GENERAL and SAFETY Vin=48V, full load, +25˚C. 91.5 93 % Efficiency @ Vin=Max 91.0 92.0 % Isolation Input to output, continuous 2250 Vdc Isolation Voltage Input to Baseplate, continuous 1500 Output to Baseplate, continuous 1500 Insulation Safety Rating basic Isolation Resistance 10 Mohm Isolation Capacitance 1,000 pF Certified to UL-60950-1, CSA-C22.2 No.60950- Safety Yes 1, IEC/EN60950-1, 2nd edition Per Telcordia SR332, issue 1 class 3, ground 6 Calculated MTBF 1.2 Hours x 10 fixed, Tambient=+25˚C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 380 420 460 KHz Power On to Vout regulated Startup Time 25 50 mS (100% resistive load) Startup Time Remote ON to 10% Vout (50% resistive load) 25 50 mS 50-75-50% load step, settling time to within Dynamic Load Response 2500 3500 µSec ±1% of Vout di/dt = 1 A/µSec Dynamic Load Peak Deviation same as above ±500 ±1000 mV FEATURES and OPTIONS Remote On/Off Control ➂ “N” suffix: Negative Logic, ON state ON = ground pin or external voltage –0.1 0.8 V Negative Logic, OFF state OFF = pin open or external voltage 2.5 15 V Control Current open collector/drain 1 2 mA “P” suffix: Positive Logic, ON state ON = pin open or external voltage 3.5 15 V Positive Logic, OFF state OFF = ground pin or external voltage 0 1 V Control Current open collector/drain 1 2 mA Remote Sense Compliance Vsense=Vout–Vload, Sense connected at load 10 % of Vout www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 8 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D48 (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power See Derating 0.0 350 355.25 W Voltage Nominal Output Voltage No trim 27.58 28 28.42 Vdc Setting Accuracy At 50% load -1.5 1.5 % of Vnom. Output Voltage Range User-adjustable 16.8(-40%) 32.2(+15%) Vdc Overvoltage Protection Via magnetic feedback 34 36 50 Vdc Current Output Current Range 0 12.5 A Minimum Load No minimum load 98% of Vnom., after warmup 16 19 25 A Current Limit Inception ➃ Short Circuit Hiccup technique, Short Circuit Current 0.01 0.1 A autorecovery within ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method Current limiting Regulation ➄ Line Regulation Vin=min. to max. Vout=nom. ±0.25 % Load Regulation Iout=min. to max. Vin=48V. ±0.25 % Ripple and Noise 5 Hz- 20 MHz BW 100 300 mV pk-pk Temperature Coefficient At all outputs ±0.015 % of Vnom./°C External output capacitance required ➅ Cap. ESR=<0.02Ω, Full resistive load 470 4700 μF MECHANICAL (Through Hole Models) Outline Dimensions with baseplate; see mechanical drawings 2.3 x 2.4 x 0.5 Inches 58.4 x 60.96 x 12.7 mm Weight 3.67 Ounces 104 Grams Through Hole Pin Diameter Pins 1–4, 6–8/5,9 0.04/0.08 Inches 1.016/2.032 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 100-299 µ-inches Gold overplate 10.31 µ-inches Case or Baseplate Material Aluminum ENVIRONMENTAL Operating Ambient Temperature Range With derating, full power, measured at Tref -40 85 ˚C Operating Case Temperature -40 120 ˚C Storage Temperature Vin = Zero (no power) -55 125 ˚C Thermal Protection/Shutdown Measured in center 115 125 130 ˚C Electromagnetic Interference External filter required B Class Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 B Class Relative humidity, non-condensing To +85°C 10 90 %RH Altitude -500 10,000 feet (must derate -1%/1000 feet) -152 3048 meters RoHS rating RoHS-6 Notes ➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage ➂ The Remote On/Off Control is referred to -Vin. and full load. General conditions are +25˚ Celsius ambient temperature, near sea level altitude, ➃ Over-current protection is non-latching with auto reovery (Hiccup) natural convection airflow. All models are tested and specified with external parallel 1 µF and 470 ➄ Regulation specifications describe the output voltage changes as the line voltage or load current µF output capacitors. A 220µF external input capacitors is required. All capacitors are low-ESR is varied from its nominal or midpoint value to either extreme. types wired close to the converter. ➅ Required minimum output capacitance is 470 µF, low ESR. ➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is Cbus=220 µF/100V, Cin=470 µF/100V and Lbus=12 µH. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 9 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 Efficiency and Power Dissipation, Ambient Temperature = +25°C Output Power Derating in Conduction Cooling (Cold Baseplate) Applications (Vin=48V, Ambient Temperature <70°C) 96 36 375 92 32 350 88 28 VIN = 75V 84 24 VIN = 48V 325 80 20 VIN = 36V 76 16 300 Power Dissipation 72 12 VIN = 48V 68 8 275 64 4 60 0 1.25 2.5 3.75 5 6.25 7.5 8.75 10 11.25 12.5 250 Iout (Amps) 20 30 40 50 60 70 80 90 100 Cold Baseplate (Interior) Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=48V, transverse airflow, from Vin- to Vout+, with baseplate) (Vin=48V, longitudinal airflow, from Vin to Vout, with baseplate) 14 14 12 12 10 10 0.25 m/s (50 LFM) 0.25 m/s (50 LFM) 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 8 8 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 6 6 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 2.5 m/s (500 LFM) 2.5 m/s (500 LFM) 3.0 m/s (600 LFM) 3.0 m/s (600 LFM) 4 4 2 2 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level Maximum Current Temperature Derating at sea level (Vin=48V, transverse airflow, from Vin- to Vout+, with baseplate) (Vin=48V, longitudinal airflow, from Vin to Vout, with baseplate) 360 360 340 340 320 320 300 300 280 280 0.25 m/s (50 LFM) 0.25 m/s (50 LFM) 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 260 260 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 240 240 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 220 220 2.5 m/s (500 LFM) 2.5 m/s (500 LFM) 3.0 m/s (600 LFM) 3.0 m/s (600 LFM) 200 200 180 180 160 160 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 10 of 21 Output Power (Watts) Output Current (Amps) Efficiency (%) Dissipation (Watts) Output Power (Watts) Output Current (Amps) Output Power (Watts) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 On/Off Enable Startup (Vin=48V, Vout=nom, Iout=12.5A, Cload=470µF, Ta=+25°C) Startup Delay (Vin=48V, Vout=nom, Iout=12.5A, Cload=470µF, Ta=+25°C)Ch1=Vin, Ch2=Vout, Ch4=Enable Ch2=Vout Output Ripple and Noise (Vin=48V, Vout=nom, Iout=0A, Cload=470µF, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=12.5A, Cload=470µF, Ta=+25°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 11 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 Step Load Transient Response (Vin=48V, Vout=nom, Cload=470µF, Step Load Transient Response (Vin=48V, Vout=nom, Cload=470µF, Iout=75 % to 50% of full load, Ta=+25°C) Iout=50% to 75% of full load, Ta=+25°C) Step Load Transient Response (Vin=48V, Vout=nom, Cload=470µF, Iout=50-75-50% of full load, Ta=+25°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 12 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters MECHANICAL SPECIFICATIONS 0.50 (12.7) 0.008 (0.20) Min PIN STANDOFF IS LOWER THAN DIA 3.2mm THROUGH HOLE RIVET STANDOFF 1 9 2 8 7 3 6 4 5 2.30 (58.42) SECTION A-A Bottom Pin Side View Dimensions are in inches (mm shown for ref. only). Third Angle Projection 0.165 (4.19) ±0.015 (±0.38) PINS 1-4,6-8: Tolerances (unless otherwise specified): φ 0.040±0.001(1.016±0.025) PINS 5,9: .XX ± 0.02 (0.5) φ 0.082±0.001(2.083±0.025) 1.900 (48.26) .XXX ± 0.010 (0.25) SEE NOTE 8 Angles ± 2˚ Components are shown for reference only. MOUNTING INSERT OPTIONAL NOTES: B: M3 THREAD TYP 4PL UNLESS OTHERWISE SPECIFIED: B1: φ 3.2 THRU HOLE TYP 4PL 1:FOR OPTIONAL M3, THE M3 SCREW USED TO BOLT UNIT'S BASEPLATE TO OTHER SURFACES (SUCH AS HEATSINK) MUST NOT OUT OF THE RANGE FROM 0.138''(3.5mm) TO 0.236''(6mm)DEPTH BELOW THE SURFACE OF BASEPLATE 2:APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb(0.6Nm); 3:ALL DIMENSION ARE IN INCHES [MILLIMETERS]; 4:ALL TOLERANCES: ×.××in ,±0.02in(×.×mm,±0.5mm) ×.×××in ,±0.01in(×.××mm,±0.25mm) 5:COMPONENTS WILL VARY BETWEEN MODELS 6:OVERALL DIMENSIONS:2.30(58.42)×2.4(60.96)×0.50(12.7) BEFORE REMOVAL OF PROTECTIVE HEAT SHIELD; 7:*The Remote On/Off Can Be Provided With Either Positive Or Negative ("N"Suffix) Logic 8:STANDARD PIN LENGTH: 0.180 Inch FOR L2 PIN LENGTH OPTION IN MODEL NAME, USE STANDARD L2 PIN WITH PIN LENGTH TO 0.145 Inch Top View INPUT/OUTPUT CONNECTIONS Pin Function 1 −Vin Since there is some pinout inconsistency between manufacturers of half brick converters, be 2 Case ground sure to follow the pin function, not the pin number, when laying out your board. 3 On/Off Control 4 +Vin Standard pin length is shown. Please refer to the Part Number Structure for special order pin 5 +Vout lengths. 6 +Sense 7 Trim * Note that the “case” connects to the baseplate (when installed). This case connection is 8 −Sense isolated from the rest of the converter. Pin 2 may be deleted under special order. Please contact Murata Power Solutions for information. 9 −Vout The Trim connection may be left open and the converter will achieve its rated output voltage. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 13 of 21 2.40 (60.96) 1.400 (35.56) 0.50 (12.7) 0.600 (15.24) 2.00 (50.8) L 0.010 (0.254) Min 0.600 (15.24) 1.400 (35.56) 0.126 (3.2) THREADED TYP 4PL 0.335 (8.51) TYP 4PL PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters BASEPLATE WITH STANDARD M3-12.7 THREADED RIVET BASEPLATE WITH UNTHREADED INSERT www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 14 of 21 4.25 (107.95) 10 (254) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters SHIPPING TRAYS: LOW DENSITY CLOSED CELL POLYETHYLENE STATIC DISSIPATIVE FOAM +.000 -.062 9.920 0.50 (251.97) (12.7) 2.300 0.625 (58.42) TYP (15.86) TYP +.000 9.920 -.062 (251.97) 0.625 (15.86)TYP 2.400 (60.96) TYP 1.150 (29.21) .25 (6.35) R TYP .25 (6.35) CHAMFER TYP (4-PL) TYP SHIPPING BOXES Anti-static foam Label top side Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 15 of 21 10 (254) PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters impedance, performance is improved by adding external filter components. TECHNICAL NOTES Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to Input Fusing totally characterize all applications, some experimentation may be needed. Certain applications and/or safety agencies may require fuses at the inputs of Note that external input capacitors must accept high speed switching currents. power conversion components. Fuses should also be used when there is the Because of the switching nature of DC-DC converters, the input of these possibility of sustained input voltage reversal which is not current-limited. For converters must be driven from a source with both low AC impedance and greatest safety, we recommend a fast blow fuse installed in the ungrounded adequate DC input regulation. Performance will degrade with increasing input input supply line. inductance. Excessive input inductance may inhibit operation. The DC input The installer must observe all relevant safety standards and regulations. For regulation specifies that the input voltage, once operating, must never degrade safety agency approvals, install the converter in compliance with the end-user below the Shut-Down Threshold under all load conditions. Be sure to use safety standard. adequate trace sizes and mount components close to the converter. Input Reverse-Polarity Protection I/O Filtering, Input Ripple Current and Output Noise If the input voltage polarity is reversed, an internal diode will become forward All models in this converter series are tested and specified for input reflected biased and likely draw excessive current from the power source. If this source ripple current and output noise using designated external input/output compo- is not current-limited or the circuit appropriately fused, it could cause perma- nents, circuits and layout as shown in the figures below. External input capacitors nent damage to the converter. (Cin in the figure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient IR drops in the input conductors. Users Input Under-Voltage Shutdown and Start-Up Threshold should select input capacitors for bulk capacitance (at appropriate frequen- Under normal start-up conditions, converters will not begin to regulate properly cies), low ESR and high RMS ripple current ratings. In the figure below, the Cbus until the ramping-up input voltage exceeds and remains at the Start-Up and Lbus components simulate a typical DC voltage bus. Your specific system Threshold Voltage (see Specifications). Once operating, converters will not configuration may require additional considerations. Please note that the values turn off until the input voltage drops below the Under-Voltage Shutdown Limit. of Cin, Lbus and Cbus will vary according to the specific converter model. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off opera- tion at a single input voltage. Users should be aware however of input sources near the Under-Voltage TO CURRENT Shutdown whose voltage decays as input current is consumed (such as capac- OSCILLOSCOPE PROBE itor inputs), the converter shuts off and then restarts as the external capacitor +VIN recharges. Such situations could oscillate. To prevent this, make sure the LBUS + operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. – VIN CBUS CIN + Start-Up Time – Assuming that the output current is set at the rated maximum, the Vin to Vout –VIN Start-Up Time (see Specifications) is the time interval between the point when CIN = 33µF, ESR < 700mΩ @ 100kHz the ramping input voltage crosses the Start-Up Threshold and the fully loaded CBUS = 220µF, ESR < 100mΩ @ 100kHz regulated output voltage enters and remains within its specified accuracy band. LBUS = 12µH Actual measured times will vary with input source impedance, external input Figure 2. Measuring Input Ripple Current capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit to moderate the duty cycle of its In critical applications, output ripple and noise (also referred to as periodic PWM controller at power up, thereby limiting the input inrush current. and random deviations or PARD) may be reduced by adding filter elements such as multiple external capacitors. Be sure to calculate component tem- The On/Off Remote Control interval from On command to Vout regulated perature rise from reflected AC current dissipated inside capacitor ESR. Our assumes that the converter already has its input voltage stabilized above the Application Engineers can recommend potential solutions. Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified accuracy Floating Outputs band. The specification assumes that the output is fully loaded at maximum Since these are isolated DC-DC converters, their outputs are “floating” with rated current. Similar conditions apply to the On to Vout regulated specification respect to their input. The essential feature of such isolation is ideal ZERO such as external load capacitance and soft start circuitry. CURRENT FLOW between input and output. Real-world converters however do exhibit tiny leakage currents between input and output (see Specifications). Input Source Impedance These converters will operate to specifications without external components, assuming that the source voltage has very low impedance and reason- able input voltage regulation. Since real-world voltage sources have finite www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 16 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. +SENSE Also note that very low flow rates (below about 25 LFM) are similar to “natural +VOUT convection”, that is, not using fan-forced airflow. MPS makes Characterization measurements in a closed cycle wind RLOAD SCOPE C1 C2 tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. As a practical matter, it is –VOUT quite difficult to insert an anemometer to precisely measure airflow in most applications. Sometimes it is possible to estimate the effective airflow if you –SENSE thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. If in doubt, contact MPS to discuss placement and C1 = 1µF measurement techniques of suggested temperature sensors. C2 = 470µF LOAD 2-3 INCHES (51-76mm) FROM MODULE CAUTION: If you routinely or accidentally exceed these Derating guidelines, Figure 3. Measuring Output Ripple and Noise (PARD) the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected at slightly above Sea Level altitude. Be sure to reduce These leakages consist of both an AC stray capacitance coupling component the derating for higher density altitude. and a DC leakage resistance. When using the isolation feature, do not allow the isolation voltage to exceed specifications. Otherwise the converter may Output Overvoltage Protection be damaged. Designers will normally use the negative output (-Output) as This converter monitors its output voltage for an over-voltage condition using the ground return of the load circuit. You can however use the positive output an on-board electronic comparator. The signal is optically coupled to the pri- (+Output) as the ground return to effectively reverse the output polarity. 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 Minimum Output Loading Requirements period, the PWM will automatically attempt to restart, causing the output volt- These converters employ a synchronous rectifier design topology. All models age to ramp up to its rated value. It is not necessary to power down and reset regulate within specification and are stable under no load to full load condi- the converter for this automatic OVP-recovery restart. tions. Operation under no load might however slightly increase output ripple and noise. If the fault condition persists and the output voltage climbs to excessive levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling Thermal Shutdown is referred to as “hiccup” mode. It safely tests full current rated output voltage To prevent many over temperature problems and damage, these converters without damaging the converter. include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC-DC’s to rise above the Operating Temperature Range Output Current Limiting up to the shutdown temperature, an on-board electronic temperature sensor As soon as the output current increases to its maximum rated value, the DC-DC will power down the unit. When the temperature decreases below the turn-on converter will enter a current-limiting mode. The output voltage will decrease threshold, the converter will automatically restart. There is a small amount of proportionally with increases in output current, thereby maintaining a some- hysteresis to prevent rapid on/off cycling. The temperature sensor is typically what constant power output. This is commonly referred to as power limiting. located adjacent to the switching controller, approximately in the center of the Current limiting inception is defined as the point at which full power falls unit. See the Performance and Functional Specifications. below the rated tolerance. See the Performance/Functional Specifications. Note CAUTION: If you operate too close to the thermal limits, the converter may particularly that the output current may briefly rise above its rated value. This shut down suddenly without warning. Be sure to thoroughly test your applica- enhances reliability and continued operation of your application. If the output tion to avoid unplanned thermal shutdown. current is too high, the converter will enter the short circuit condition. Temperature Derating Curves Output Short Circuit Condition The graphs in this data sheet illustrate typical operation under a variety of When a converter is in current-limit mode, the output voltage will drop as the conditions. The Derating curves show the maximum continuous ambient air output current demand increases. If the output voltage drops too low, the mag- temperature and decreasing maximum output current which is acceptable netically coupled voltage used to develop primary side voltages will also drop, under increasing forced airflow measured in Linear Feet per Minute (“LFM”). thereby shutting down the PWM controller. Following a time-out period, the Note that these are AVERAGE measurements. The converter will accept brief PWM will restart, causing the output voltage to begin ramping up to its appro- increases in temperature and/or current or reduced airflow as long as the aver- priate value. If the short-circuit condition persists, another shutdown cycle will age is not exceeded. initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal tempera- tures. A short circuit can be tolerated indefinitely. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 17 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Remote Sense Input DC voltage may also be used for trimming). Trimming resistors should have a low temperature coefficient (±100 ppm/deg.C or less) and be mounted close Sense inputs compensate for output voltage inaccuracy delivered at the load. to the converter. Keep leads short. If the trim function is not used, leave the This is done by correcting voltage drops along the output wiring such as mod- trim unconnected. With no trim, the converter will exhibit its specified output erate IR drops and the current carrying capacity of PC board etch. Sense inputs voltage accuracy. also improve the stability of the converter and load system by optimizing the control loop phase margin. There are two CAUTIONs to be aware for the Trim input: Note: The Sense input and power Vout lines are internally connected through CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the low value resistors to their respective polarities so that the converter can maximum output voltage OR the maximum output power when setting the trim. operate without external connection to the Sense. Nevertheless, if the Sense Be particularly careful with a trimpot. If the output voltage is excessive, the function is not used for remote regulation, the user should connect +Sense to OVP circuit may inadvertantly shut down the converter. If the maximum power +Vout and –Sense to –Vout at the converter pins. is exceeded, the converter may enter current limiting. If the power is exceeded for an extended period, the converter may overheat and encounter overtem- The remote Sense lines carry very little current. They are also capacitively perature shut down. coupled to the output lines and therefore are in the feedback control loop to regulate and stabilize the output. As such, they are not low impedance inputs CAUTION: Be careful of external electrical noise. The Trim input is a senstive and must be treated with care in PC board layouts. Sense lines on the PCB input to the converter’s feedback control loop. Excessive electrical noise may should run adjacent to DC signals, preferably Ground. In cables and discrete cause instability or oscillation. Keep external connections short to the Trim wiring, use twisted pair, shielded tubing or similar techniques. input. Use shielding if needed. Please observe Sense inputs tolerance to avoid improper operation: [Vout(+) –Vout(-)] – [ Sense(+) – Sense(-)] ≤ 10% of Vout Contact and PCB resistance +VOUT losses due to IR drops +VIN +VOUT +VIN I OUT +SENSE +SENSE Sense Current 5-22 7 ON/OFF LOAD TRIM ON/OFF TURNS TRIM LOAD CONTROL CONTROL Sense Return –SENSE –SENSE I OUT Return –VIN –VOUT –VIN –VOUT Contact and PCB resistance losses due to IR drops Figure 4. Remote Sense Circuit Configuration Figure 5. Trim adjustments using a trimpot Output overvoltage protection is monitored at the output voltage pin, not the Sense pin. Therefore excessive voltage differences between Vout and Sense +VOUT together with trim adjustment of the output can cause the overvoltage protec- +VIN tion circuit to activate and shut down the output. +SENSE Power derating of the converter is based on the combination of maximum output current and the highest output voltage. Therefore the designer must ensure: ON/OFF TRIM LOAD (Vout at pins) x (Iout) ≤ (Max. rated output power) CONTROL R TRIM UP Trimming the Output Voltage –SENSE The Trim input to the converter allows the user to adjust the output voltage over the rated trim range (please refer to the Specifications). In the trim equa- –VIN –VOUT tions and circuit diagrams that follow, trim adjustments use either a trimpot or a single fixed resistor connected between the Trim input and either the +Sense or –Sense terminals. (On some converters, an external user-supplied precision Figure 6. Trim adjustments to Increase Output Voltage using a Fixed Resistor www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 18 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Negative-logic devices are on (enabled) when the On/Off is grounded or +VOUT brought to within a low voltage (see Specifications) with respect to –Vin. The +VIN device is off (disabled) when the On/Off is pulled high to +15V with respect to –Vin. +SENSE ON/OFF TRIM LOAD CONTROL +VIN +VCC R TRIM DOWN –SENSE ON/OFF –VIN –VOUT CONTROL Figure 7. Trim adjustments to Decrease Output Voltage using a Fixed Resistor –VIN Trim Equations V x (1+∆) 1 ( ) nominal R in kΩ = - - 2 adj_up 1.225 x ∆ ∆ Figure 9. Driving the Negative Logic On/Off Control Pin V -V out nominal where ∆ = V Dynamic control of the On/Off function should be able to sink appropriate nominal signal current when brought low and withstand appropriate voltage when 1 brought high. Be aware too that there is a finite time in milliseconds (see ( ) R in kΩ = - 2 adj_down ∆ Specifications) between the time of On/Off Control activation and stable, V -V regulated output. This time will vary slightly with output load type and current nominal out where ∆ = V nominal and input conditions. Where Vref = +1.225 Volts and ∆ is the desired output voltage change. Note There are two CAUTIONs for the On/Off Control: that "∆" is given as a small fraction, not a percentage. CAUTION: While it is possible to control the On/Off with external logic if you A single resistor connected between Trim and +Sense will increase the output carefully observe the voltage levels, the preferred circuit is either an open voltage. A resistor connected between Trim and –Sense will decrease the output. drain/open collector transistor or a relay (which can thereupon be controlled by logic). Remote On/Off Control On the input side, a remote On/Off Control can be ordered with either logic type. CAUTION: Do not apply voltages to the On/Off pin when there is no input power voltage. Otherwise the converter may be permanently damaged. Positive models are enabled when the On/Off pin is left open or is pulled high to +15V with respect to –Vin. Some models will also turn on at lower Soldering Guidelines intermediate voltages (see Specifications). Positive-logic devices are disabled Murata Power Solutions recommends the specifications below when installing these when the On/Off is grounded or brought to within a low voltage (see Specifica- converters. These specifications vary depending on the solder type. Exceeding these tions) with respect to –Vin. specifications may cause damage to the product. Your production environment may 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: For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. + Vcc Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. ON/OFF CONTROL Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds CONTROL –VIN Figure 8. Driving the Positive Logic On/Off Control Pin www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 19 of 21 UNIT UNDER TEST PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Emissions Performance [3] Conducted Emissions Test Results Murata Power Solutions measures its products for radio frequency emissions against the EN 55022 and CISPR 22 standards. Passive resistance loads are employed and the output is set to the maximum voltage. If you set up your own emissions testing, make sure the output load is rated at continuous power while doing the tests. The recommended external input and output capacitors (if required) are included. Please refer to the fundamental switching frequency. All of this information is listed in the Product Specifi cations. An external discrete fi lter is installed and the circuit diagram is shown below. C1 L1 C2 L2 C7 C8 C6 C5 C3 C4 Graph 1. Conducted emissions performance, Positive Line, CISPR 22, Class B, 48 Vin, full load Figure 10. Conducted Emissions Test Circuit [1] Conducted Emissions Parts List Reference Part Number Description Vendor CAP SMT NON POL CERAMIC C1, C2, C7 GRM32ER72A225KA35L X7R 2.2µF 100V 20% Murata 1210 COMMON MODE-809uH- L1, L2 LB22H1463 ±25%-9.7A-R5K- Haiguang 28*26*12.7mm SMD CERAMIC 630V-0.22µF- C3, C4, C5, C6 GRM55DR72J224KW01L Murata ±10%-X7R-2220 Aluminum 100V-33µF- C8 UVK2A330MPD Nichicon ±10%-long lead [2] Conducted Emissions Test Equipment Used Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153 Graph 2. Conducted emissions performance, Negative Line, 2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network CISPR 22, Class B, 48 Vin, full load [4] Layout Recommendations Most applications can use the fi ltering which is already installed inside the converter or with the addition of the recommended external capacitors. For greater emissions suppression, consider additional fi lter components and/or shielding. Emissions performance will depend on the user’s PC board layout, the chassis shielding environment and choice of external components. Please refer to Application Note GEAN02 for further discussion. Since many factors affect both the amplitude and spectra of emissions, we recommend using an engineer who is experienced at emissions suppression. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 20 of 21 PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick 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 instru- mentation for accurate airfl ow and heat dissipation analysis of power products. IR Transparent The system includes a precision low fl ow-rate anemometer, variable speed optical window Variable fan, power supply input and load controls, temperature gauges, and adjustable Unit under speed fan heating element. test (UUT) IR Video The IR camera monitors the thermal performance of the Unit Under Test Camera (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. Both through-hole and surface mount converters are soldered down to a 10" x 10" host carrier board for realistic heat absorption and spreading. Both Heating longitudinal and transverse airfl ow studies are possible by rotation of this car- element rier board since there are often signifi cant differences in the heat dissipation Precision low-rate in the two airfl ow directions. The combination of adjustable airfl ow, adjustable anemometer ambient heat, and adjustable Input/Output currents and voltages mean that a 3” below UUT very wide range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent to the UUT by Ambient temperature minimizing airfl ow turbulence. Such turbulence infl uences the effective heat sensor transfer characteristics and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly causing Airflow 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 Figure 11. Vertical Wind Tunnel gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 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. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_PAH-28Vout-350W.B06 Page 21 of 21