MURATA POWER SOLUTIONS OKI-78SR-3.3/1.5-W36HE-C

OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC Typical units FEATURES PRODUCT OVERVIEW
Encapsulated in a 0.47 x 0.69 inch (11.9 x Three nominal output voltages are offered (3.3, 7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout) 17.6 mm) vertical or horizontal package, the OKI- 5 and 12 VDC), up to 1.5 Amp maximum output.
Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A 78SR-E series are non-isolated switching Based on fixed-frequency buck switching
Vertical SIP or horizontal mount, small footprint, regulator (SR) DC-DC power converters for topology, the high efficiency means very low heat in an Encapsulated package embedded applications. The fixed single output and little electrical noise, requiring no external
converters offer both tight regulation and high components. The 3.3 and 5Vout models have an “No heat sink” direct replacement for 3-terminal efficiency directly at the power usage site and are ultra wide input range of 7 to 36 Volts DC and the 78xx-series linear regulators a direct plug-in replacement for TO-220 package 12Vout model has an input voltage range of 15 to
High efficiency with no external components 78xx series linear regulators. Typically, no extra 36V.
Short circuit protection outside components are required. Protection features include short circuit
Outstanding thermal derating performance current limit protection. The OKI-78SR-E is
UL/EN/IEC 60950-1, 2nd Edition safety approvals designed to meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is specified as standard. Connection Diagram +Vin +Vout • Switching F1 • Filters Controller • Current Sense External DC Power Reference and Source Error Amplifier Common Common Figure 1. OKI-78SR-E Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. (Pending) For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 1 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input IOUT R/N (mVp-p) Regulation (Typ.) IIN, IIN, Efficiency VOUT (Amps Power VIN Nom. Range no load full load Package Root Model (Volts) max) (Watts) Max. Line Load (Volts) (Volts) (mA) (Amps) Min. Typ. Inches (mm) 0.47 x 0.40 x 0.69 OKI-78SR-3.3/1.5-W36E-C 3.3 1.5 4.95 40 ±0.30% ±0.40% 12 7-36 5 0.48 84% 85.5% (11.9 x 10.0 x 17.6) 0.47 x 0.40 x 0.69 OKI-78SR-5/1.5-W36E-C 5 1.5 7.5 75 ±0.30% ±0.40% 12 7-36 5 0.69 89% 90.5% (11.9 x 10.0 x 17.6) 0.47 x 0.40 x 0.69 OKI-78SR-12/1.0-W36E-C 12 1.0 12 75 ±0.25% ±0.25% 24 15-36 5 0.53 93.5% 95.3% (11.9 x 10.0 x 17.6) NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25˚C.with no external capacitor, unless otherwise noted. NOTE: Please click here to view the data sheet for the OKI-78SR “Open-frame” series. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 2 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36E-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions ① Full power operation 0 36 Vdc Input Voltage, Continuous Input Reverse Polarity None, install external fuse None Vdc Output Power 0 5.15 W Output Current Current-limited, no damage, short-circuit protected 0 1.5 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 Specifications Table is not implied or recommended. INPUT Operating voltage range 7 12 36 Vdc Recommended External Fuse Fast blow 2 A None, install external fuse None Vdc Reverse Polarity Protection ⑨ Internal Filter Type C-TYPE Input current Full Load Conditions 0.48 0.51 A Vin = nominal Low Line Vin @ min 0.80 0.85 A 2 Inrush Transient 0.16 A -Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 50 mA, pk-pk Reflected (back) ripple current ② GENERAL and SAFETY @ Vin nom, 3.3Vout 83.7 85.5 % Efficiency @ Vin min, 3.3Vout 87.0 88.4 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground 6 78.7 Hours x 10 Calculated MTBF ④ fixed, Tambient=+25°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 25 50 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 100 150 mV www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 3 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36E-C (CONT.) OUTPUT Minimum Typical/Nominal Maximum Units Conditions Total Output Power 0 4.95 5.15 W Voltage 3.3 Nominal Output Voltage Range 3.168 3.432 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.5 1.5 A No minimum load Minimum Load ⑪ 98% of Vnom., after warmup @3.3Vout 2.50 3.50 5.00 A Current Limit Inception Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within 0.01 A Short Circuit Current ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Current limiting Short circuit protection method ⑧ Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.30 % Load Regulation Iout=min. to max. ±0.40 % 3.3Vo, 12Vin 40 mV pk-pk Ripple and Noise (20MHz BW ) ⑪ 30 Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL 0.47 x 0.69 x 0.40 Inches Outline Dimensions 11.9 x 17.6 x 10.0 mm Weight 0.16 Ounces 4.5 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL Operating Ambient Temperature Range ③ see derating curves -40 85 °C Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 7) The output is not intended to sink appreciable reverse current. 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended output. If the overcurrent condition still exists, the restart current will be removed and then tried again. testing under power. See Derating curves.. This short current pulse prevents overheating and damaging the converter. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher full input current rating with nominal input voltage. temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea from a nominal midpoint value to either extreme. level altitude. Be aware of reduced power dissipation with increasing altitude. 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground capacitance. At zero output current and no external capacitor, the output may contain low frequency fixed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. components which exceed the ripple specification. The output may be operated indefinitely with no load. 5) The input and output are not isolated. They share a single COMMON power and signal return. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 4 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36E-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 100 2.00 90 80 70 VIN = 7V VIN = 12V 60 0.33 m/s (65 LFM) VIN = 36V 1.00 50 40 30 20 10 0.00 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ambient Temperature (ºC) Load Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 5 of 20 Efficiency (%) Output Current (Amps) OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36E-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 6 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36E-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions ① Input Voltage, Continuous Full power operation 0 36 Vdc Input Reverse Polarity None, install external fuse None Vdc Output Power 0 7.80 W Output Current Current-limited, no damage, short-circuit protected 0 1.5 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 Specifications Table is not implied or recommended. INPUT Operating voltage range 7 12 36 Vdc Recommended External Fuse Fast blow 2 A Reverse Polarity Protection ⑨ None, install external fuse None Vdc Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal 0.69 0.73 A Low Line Vin @ min 1.16 1.22 A 2 Inrush Transient 0.16 A -Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 15 mA, pk-pk Reflected (back) ripple current ② GENERAL and SAFETY @ Vin nom, 5Vout 89.0 90.5 % Efficiency @ Vin min, 5Vout 91.4 92.5 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground 6 78.7 Hours x 10 Calculated MTBF ④ fixed, Tambient=+25°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 50 75 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 150 200 mV www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 7 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36E-C (CONT.) OUTPUT Minimum Typical/Nominal Maximum Units Conditions Total Output Power 0 7.5 7.8 W Voltage 5.0 Nominal Output Voltage Range 4.8 5.2 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.5 1.5 A No minimum load Minimum Load ⑪ 98% of Vnom., after warmup @5Vout 2.50 3.50 5.00 A Current Limit Inception Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within 0.01 A Short Circuit Current ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Current limiting Short circuit protection method ⑧ Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.30 % Load Regulation Iout=min. to max. ±0.40 % 5Vo, 12Vin 75 mV pk-pk Ripple and Noise (20MHz BW) ⑪ 50 Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL Outline Dimensions 0.47 x 0.69 x 0.40 Inches 11.9 x 17.6 x 10.0 mm Weight 0.16 Ounces 4.5 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL see derating curves -40 85 °C Operating Ambient Temperature Range ③ Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 7) The output is not intended to sink appreciable reverse current. 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended output. If the overcurrent condition still exists, the restart current will be removed and then tried again. testing under power. See Derating curves.. This short current pulse prevents overheating and damaging the converter. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher full input current rating with nominal input voltage. temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea from a nominal midpoint value to either extreme. level altitude. Be aware of reduced power dissipation with increasing altitude. 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground capacitance. At zero output current and no external capacitor, the output may contain low frequency fixed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. components which exceed the ripple specification. The output may be operated indefinitely with no load. 5) The input and output are not isolated. They share a single COMMON power and signal return. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 8 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36E-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 100 2.00 90 80 VIN = 7V 70 VIN = 12V VIN = 36V 60 0.33 m/s (65 LFM) 1.00 50 40 30 20 10 0.00 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ambient Temperature (ºC) Load Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 9 of 20 Efficiency (%) Output Current (Amps) OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36E-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=12V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 10 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36E-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions ① Input Voltage, Continuous Full power operation 0 36 Vdc Input Reverse Polarity None, install external fuse None Vdc Output Power 0 5.15 W Output Current Current-limited, no damage, short-circuit protected 0 1.0 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 Specifications Table is not implied or recommended. INPUT Operating voltage range 15 24 36 Vdc Recommended External Fuse Fast blow 2 A Reverse Polarity Protection ⑨ None, install external fuse None Vdc Internal Filter Type C-TYPE Input current Full Load Conditions Vin = nominal 0.53 0.56 A Low Line Vin @ min 0.84 0.87 A 2 Inrush Transient 0.16 A -Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 30 mA, pk-pk Reflected (back) ripple current ② GENERAL and SAFETY @ Vin nom, 12Vout 93.5 95.3 % Efficiency @ Vin min, 12Vout 95.5 97.0 % Certified to UL-60950-1, IEC/EN60950-1, Safety Yes 2nd Edition Per Telcordia SR332, issue 1, class 3, ground 6 25.9 Hours x 10 Calculated MTBF ④ fixed, Tambient=+25°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz 50-100-50% load step, settling time to within Dynamic Load Response 50 75 μSec ±2% of Vout di/dt =1A/μSec Dynamic Load Peak Deviation same as above 165 225 mV www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 11 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36E-C (CONT.) OUTPUT Minimum Typical/Nominal Maximum Units Conditions Total Output Power 0 12.0 12.5 W Voltage 12.0 Nominal Output Voltage Range 11.52 12.48 Vdc Setting Accuracy At 50% load -4 4 % of Vnom. Output Voltage Overshoot - Startup: 3 %Vo nom Current Output Current Range 0 1.0 1.0 A No minimum load Minimum Load ⑪ 98% of Vnom., after warmup @12Vout 2.50 3.50 5.00 A Current Limit Inception Short Circuit Mode ⑥⑪ Hiccup technique, autorecovery within 0.01 A Short Circuit Current ±1% of Vout Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Current limiting Short circuit protection method ⑧ Regulation ⑩ Total Regulation Band Over all line, load and temp conditions -3 Vo set 3 % Vo set Line Regulation Vin=min. to max. Vout=nom. ±0.25 % Load Regulation Iout=min. to max. ±0.25 % 12Vo, 24Vin 75 mV pk-pk Ripple and Noise (20MHz BW) ⑪ 50 Temperature Coefficient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 μF Maximum Capacitive Loading 0.01 ohm 3300 μF MECHANICAL Outline Dimensions 0.47 x 0.69 x 0.40 Inches 11.9 x 17.6 x 10.0 mm Weight 0.16 Ounces 4.5 Grams Pin Material copper alloy Pin Finish Matte Tin 100-300 μ" Nickel 75-150 μ" ENVIRONMENTAL see derating curves -40 85 °C Operating Ambient Temperature Range ③ Storage Temperature Vin = Zero (no power) -55 125 °C RoHS Compliant RoHS-6 Specification Notes: 7) The output is not intended to sink appreciable reverse current. 1) All specifications are typical unless noted. General conditions for Specifications are +25 deg.C ambient 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airflow must be supplied for extended output. If the overcurrent condition still exists, the restart current will be removed and then tried again. testing under power. See Derating curves.. This short current pulse prevents overheating and damaging the converter. 2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, x 100 μF, Cbus=1000 μF, Lbus=1 μH. All caps are low ESR types. always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher full input current rating with nominal input voltage. temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total 10) Regulation specifications describe the deviation as the line input voltage or output load current is varied RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea from a nominal midpoint value to either extreme. level altitude. Be aware of reduced power dissipation with increasing altitude. 11) Output noise may be further reduced by installing an external filter. Do not exceed the maximum output 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Issue 2, Class 3, capacitance. At zero output current and no external capacitor, the output may contain low frequency ground benign, controlled conditions, Tpcboard=+25 ˚C, full output load, natural air convection. components which exceed the ripple specification. The output may be operated indefinitely with no load. 5) The input and output are not isolated. They share a single COMMON power and signal return. 6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Output current limit and short circuit protection are non-latching. When the overcurrent fault is removed, the converter will immediately recover. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 12 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-12/1.0-W36E-C Efficiency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=15V to 36V) Output Ripple and Noise (Vin=15V, Vout=nominal, Iout=1.0A, Cload=0, Output Ripple and Noise (Vin=24V, Vout=nominal, Iout=1.0A, Cload=0, Ta=+25˚C., Ta=+25˚C., ScopeBW=100MHz) ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.0A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 13 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-12/1.0-W36E-C Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=24V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=24V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Step Load Transient Response (Vin=36V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Slew=1A/μS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 14 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- VERTICAL MOUNT www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 15 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- HORIZONTAL MOUNT 1 2 3 www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 16 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC RECOMMENDED FOOTPRINTS www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 17 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC STANDARD PACKAGING ICAL SPECIFICATIONS, VERTICAL MOUNT www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 18 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC TECHNICAL NOTES Input Fusing TO Certain applications and/or safety agencies may require fuses at the inputs of CURRENT OSCILLOSCOPE power conversion components. Fuses should also be used when there is the PROBE possibility of sustained input voltage reversal which is not current-limited. For +VIN greatest safety, we recommend a fast blow fuse installed in the ungrounded LBUS + input supply line. – VIN CBUS CIN + The installer must observe all relevant safety standards and regulations. For – safety agency approvals, install the converter in compliance with the end-user safety standard. -VIN CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz Recommended Input Filtering CBUS = 1000μF, ESR < 100mΩ @ 100kHz The user must assure that the input source has low AC impedance to provide LBUS = 1μH dynamic stability and that the input supply has little or no inductive content, including long distributed wiring to a remote power supply. The converter will Figure 3 Measuring Input Ripple Current operate with no additional external capacitance if these conditions are met. For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter’s input terminals. The capacitor should be a ceramic type such as the Murata GRM32 series or a polymer type. Initial suggested capacitor values are 10 to 22 μF, rated at twice the expected maxi- +VOUT mum input voltage. Make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. More input bulk capacitance may RLOAD SCOPE C1 C2 be added in parallel (either electrolytic or tantalum) if needed. Recommended Output Filtering -VOUT The converter will achieve its rated output ripple and noise with no additional external capacitor. However, the user may install more external output capaci- tance to reduce the ripple even further or for improved dynamic response. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. C1 = 1μF Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in C2 = 10μF parallel. Mount these close to the converter. Measure the output ripple under LOAD 2-3 INCHES (51-76mm) FROM MODULE your load conditions. Figure 4. Measuring Output Ripple and Noise (PARD) Use only as much capacitance as required to achieve your ripple and noise objectives. Excessive capacitance can make step load recovery sluggish or possibly introduce instability. Do not exceed the maximum rated output capaci- tance listed in the specifications. Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the following figures. The Cbus and Lbus components simulate a typical DC voltage bus. Please note that the values of Cin, Lbus and Cbus will vary according to the specific converter model. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 19 of 20 OKI-78SR-E Series Encapsulated Non-Isolated Switching Regulator DC-DC Minimum Output Loading Requirements Output Fusing All models regulate within specification and are stable under no load to full The converter is extensively protected against current, voltage and temperature load conditions. Operation under no load might however slightly increase extremes. However your output application circuit may need additional protec- output ripple and noise. tion. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate fuse in series Temperature Derating Curves with the output. The graphs in this data sheet illustrate typical operation under a variety of Output Current Limiting conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable Current limiting inception is defined as the point at which full power falls below under increasing forced airflow measured in Linear Feet per Minute (“LFM”). the rated tolerance. See the Performance/Functional Specifications. Note par- Note that these are AVERAGE measurements. The converter will accept brief ticularly that the output current may briefly rise above its rated value in normal increases in current or reduced airflow as long as the average is not exceeded. operation as long as the average output power is not exceeded. This enhances reliability and continued operation of your application. If the output current is Note that the temperatures are of the ambient airflow, not the converter too high, the converter will enter the short circuit condition. itself which is obviously running at higher temperature than the outside air. Also note that “natural convection” is defined as very flow rates which are not Output Short Circuit Condition using fan-forced airflow. Depending on the application, “natural convection” is When a converter is in current-limit mode, the output voltage will drop as the usually about 30-65 LFM but is not equal to still air (0 LFM). output current demand increases. If the output voltage drops too low (approxi- mately 98% of nominal output voltage for most models), the bias voltage may Murata Power Solutions makes Characterization measurements in a closed shut down the PWM controller. Following a time-out period, the PWM will cycle wind tunnel with calibrated airflow. We use both thermocouples and an restart, causing the output voltage to begin rising to its appropriate value. If the infrared camera system to observe thermal performance. As a practical matter, short-circuit condition persists, another shutdown cycle will initiate. This rapid it is quite difficult to insert an anemometer to precisely measure airflow in on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average most applications. Sometimes it is possible to estimate the effective airflow if output current, thereby preventing excessive internal temperatures and/or you thoroughly understand the enclosure geometry, entry/exit orifice areas and component damage. the fan flowrate specifications. The “hiccup” system differs from older latching short circuit systems CAUTION: If you routinely or accidentally exceed these Derating guidelines, because you do not have to power down the converter to make it restart. The the converter may have an unplanned Over Temperature shut down. Also, these system will automatically restore operation as soon as the short circuit condi- graphs are all collected at near Sea Level altitude. Be sure to reduce the derat- tion is removed. ing for higher altitude. Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica- tions 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. Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds 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: 11 Cabot Boulevard, Mansfield, 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. Specifications are subject to change without notice. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_OKI-78SR-W36E.A01 Page 20 of 20