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I50115H

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Non-Isolated Switching Regulator DC-DC

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www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 1 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC Typical units

FEATURES

/square67-36Vin (3.3 & 5Vout), 15-36Vin (12Vout) /square6Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A PRODUCT OVERVIEW /square6Vertical SIP or horizontal mount, small footprint package /square6“No heat sink” direct replacement for 3-terminal 78xx-series linear regulators /square6High efﬁciency with no external components /square6Short circuit protection /square6Outstanding thermal derating performance /square6UL/EN/IEC 60950-1, 2nd Edition safety approvals Fabricated on a 0.41 x 0.65 inch (10.4 x 16.5 mm) Single Inline Package (SIP) module, the OKI- 78SR series are non-isolated switching regulator (SR) DC-DC power converters for embedded ap- plications. The ﬁxed single output converters offer both tight regulation and high efﬁciency directly at the power usage site and are a direct plug-in replacement for TO-220 package 78xx series linear regulators. Typically, no extra outside components are required. Three nominal output voltages are offered (3.3, 5 and 12 VDC), up to 1.5 Amp maximum output. Based on ﬁxed-frequency buck switching topology, the high efﬁciency means very low heat and little electrical noise, requiring no external components. The 3.3 and 5Vout models have an ultra wide input range of 7 to 36 Volts DC and the 12Vout model has an input voltage range of 15 to 36V. Protection features include short circuit current limit protection. The OKI-78SR is designed to meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is speciﬁed as standard. For full details go to www.murata-ps.com/rohs Connection Diagram Figure 1. OKI-78SR Note: Murata Power Solutions strongly recommends an external input fuse, F1.

Switching
Filters
Current Sense

Contact Murata Power Solutions. (Amps) Max. Line Load Min. Typ. NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25˚C.with no external capacitor, unless otherwise noted. Figure 2. Label Artwork Layout

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 3 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units 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 1.5 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 0.48 0.51 A Low Line Vin @ min 0.80 0.85 A Inrush Transient 0.16 A 2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reﬂected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 50 mA, pk-pk GENERAL and SAFETY Efficiency @ Vin nom, 3.3Vout 83.7 85.5 % @ Vin min, 3.3Vout 87.0 88.4 % Safety Certiﬁed to UL-60950-1, IEC/EN60950-1, 2nd Edition Yes Calculated MTBF ④ Per Telcordia SR332, issue 1, class 3, ground ﬁxed, Tambient=+25°C 78.7 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz Dynamic Load Response 50-100-50% load step, settling time to within ±2% of Vout di/dt =1A//uni03BCSec 25 50 /uni03BCSec Dynamic Load Peak Deviation same as above 100 150 mV

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 4 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-3.3/1.5-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 4.95 5.15 W Voltage Nominal Output Voltage Range 3.1 68 3.3 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 Minimum Load ⑪ No minimum load Short Circuit Mode ⑥⑪ Short Circuit Current Hiccup technique, autorecovery within ±1% of Vout 0.01 A Short Circuit Duration (remove short for recovery) Output shorted to ground, no damage Continuous Short circuit protection method ⑧ Current limiting 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. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 3.3Vo, 12Vin 30 40 mV pk-pk Temperature Coefﬁcient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 /uni03BCF Maximum Capacitive Loading 0.01 ohm 3300 /uni03BCF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces

2 Grams

Pin Finish Matte Tin 100-300 /uni03BC" Nickel 75-150 /uni03BC" 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: 1) All speciﬁcations are typical unless noted. General conditions for Speciﬁcations are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airﬂow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and speciﬁed over a 5 Hz to 20 MHz bandwidth. Input ﬁltering is Cin=2 x 100 /uni03BCF, Cbus=1000 /uni03BCF, Lbus=1 /uni03BCH. All caps are low ESR types. 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airﬂow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea level altitude. Be aware of reduced power dissipation with increasing altitude. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground ﬁxed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. 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. 7) The output is not intended to sink appreciable reverse current. 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage. 10) Regulation speciﬁcations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 11) Output noise may be further reduced by installing an external ﬁlter. Do not exceed the maximum output capacitance. At zero output current and no external capacitor, the output may contain low frequency components which exceed the ripple speciﬁcation. The output may be operated indeﬁnitely with no load.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 5 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC VIN = 7V VIN = 36V 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 50 1.00 Load Current (Amps) 0.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) 0.33 m/s (65 LFM) PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36-CEfficiency (%) Output Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1 .5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) VIN = 12V

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 6 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-3.3/1.5-W36-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div Step Load Transient Response (Vin=7V, Vout=nominal, C load=0, Iout=1.5A to 0.75A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.5A to 0.75A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.5A to 0.75A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 7 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units 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 Inrush Transient 0.16 A 2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reﬂected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 15 mA, pk-pk GENERAL and SAFETY Efficiency @ Vin nom, 5Vout 89.0 90.5 % @ Vin min, 5Vout 91.4 92.5 % Safety Certiﬁed to UL-60950-1, IEC/EN60950-1, 2nd Edition Yes Calculated MTBF ④ Per Telcordia SR332, issue 1, class 3, ground ﬁxed, Tambient=+25°C 78.7 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz Dynamic Load Response 50-100-50% load step, settling time to within ±2% of Vout di/dt =1A//uni03BCSec 50 75 /uni03BCSec Dynamic Load Peak Deviation same as above 150 200 mV

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 8 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-5/1.5-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 7.5 7.8 W Voltage Nominal Output Voltage Range 4.8 5.0 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 Minimum Load ⑪ No minimum load Current Limit Inception 98% of Vnom., after warmup @5Vout 2.50 3.50 5. 00 A Short Circuit Mode ⑥⑪ Short Circuit Current Hiccup technique, autorecovery within ±1% of V out 0.01 A Short Circuit Duration (remove short for recovery) Output shorted to ground, no damage Continuous Short circuit protection method ⑧ Current limiting 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. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 5Vo, 12Vin 50 75 mV pk-pk Temperature Coefﬁcient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 /uni03BCF Maximum Capacitive Loading 0.01 ohm 3300 /uni03BCF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces Pin Finish Matte Tin 100-300 /uni03BC" Nickel 75-150 /uni03BC" 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: 1) All speciﬁcations are typical unless noted. General conditions for Speciﬁcations are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airﬂow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and speciﬁed over a 5 Hz to 20 MHz bandwidth. Input ﬁltering is Cin=2 x 100 /uni03BCF, Cbus=1000 /uni03BCF, Lbus=1 /uni03BCH. All caps are low ESR types. 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airﬂow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea level altitude. Be aware of reduced power dissipation with increasing altitude. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground ﬁxed conditions, Tpcboard=+25 ˚C, full output load, natural air convection. 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. 7) The output is not intended to sink appreciable reverse current. 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage. 10) Regulation speciﬁcations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 11) Output noise may be further reduced by installing an external ﬁlter. Do not exceed the maximum output capacitance. At zero output current and no external capacitor, the output may contain low frequency components which exceed the ripple speciﬁcation. The output may be operated indeﬁnitely with no load.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 9 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC VIN = 7V VIN = 12V 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 50 1.00 Load Current (Amps) 0.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) 0.33 m/s (65 LFM) PERFORMANCE DATA – OKI-78SR-5/1.5-W36-CEfficiency (%) Output Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1 .5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) VIN = 36V

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 10 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-5/1.5-W36-C Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=0.75A to 1.5A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=7V, Vout=nominal, C load=0, Iout=1.5A to 0.75A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.5A to 0.75A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.5A to 0.75A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 11 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36-C ABSOLUTE MAXIMUM RATINGS Conditions ① Minimum Typical/Nominal Maximum Units 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 Inrush Transient 0.16 A 2-Sec. Short Circuit Input Current 5 mA No Load Input Current Vin = nominal 5 10 mA Shut-Down Mode Input Current 1 mA Reﬂected (back) ripple current ② (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 30 mA, pk-pk GENERAL and SAFETY Efficiency @ Vin nom, 12Vout 93.5 95.3 % @ Vin min, 12Vout 95.5 97.0 % Safety Certiﬁed to UL-60950-1, IEC/EN60950-1, 2nd Edition Yes Calculated MTBF ④ Per Telcordia SR332, issue 1, class 3, ground ﬁxed, Tambient=+25°C 25.9 Hours x 106 DYNAMIC CHARACTERISTICS Fixed Switching Frequency 500 kHz Dynamic Load Response 50-100-50% load step, settling time to within ±2% of Vout di/dt =1A//uni03BCSec 50 75 /uni03BCSec Dynamic Load Peak Deviation same as above 165 225 mV

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 12 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS – OKI-78SR-12/1.0-W36-C (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power 0 12.0 12.5 W Voltage Nominal Output Voltage Range 11. 52 12.0 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 Minimum Load ⑪ No minimum load Current Limit Inception 98% of Vnom., after warmup @12Vout 2.50 3.50 5 .00 A Short Circuit Mode ⑥⑪ Short Circuit Current Hiccup technique, autorecovery within ±1% of Vout 0.01 A Short Circuit Duration (remove short for recovery) Output shorted to ground, no damage Continuous Short circuit protection method ⑧ Current limiting 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. ±0.40 % Ripple and Noise (20MHz BW) ⑪ 12Vo, 24Vin 50 75 mV pk-pk Temperature Coefﬁcient At all outputs ±0.02 % of Vnom./°C Maximum Capacitive Loading low ESR; >0.001, <0.01 ohm 300 /uni03BCF Maximum Capacitive Loading 0.01 ohm 3300 /uni03BCF MECHANICAL Outline Dimensions 0.41 x 0.65 x 0.34 Inches 10.4 x 16.5 x 8.64 mm Weight 0.07 Ounces Pin Finish Matte Tin 100-300 /uni03BC" Nickel 75-150 /uni03BC" 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: 1) All speciﬁcations are typical unless noted. General conditions for Speciﬁcations are +25 deg.C ambient temperature, Vin=nominal, Vout=nominal, full rated load. Adequate airﬂow must be supplied for extended testing under power. See Derating curves.. 2) Input Back Ripple Current is tested and speciﬁed over a 5 Hz to 20 MHz bandwidth. Input ﬁltering is Cin=2 x 100 /uni03BCF, Cbus=1000 /uni03BCF, Lbus=1 /uni03BCH. All caps are low ESR types. 3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airﬂow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented near sea level altitude. Be aware of reduced power dissipation with increasing altitude. 4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Issue 2, Class 3, ground benign, controlled conditions, Tpcboard=+25 ˚C, full output load, natural air convection. 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. 7) The output is not intended to sink appreciable reverse current. 8) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. 9) Input Fusing: If reverse polarity is accidentally applied to the input, to ensure reverse input protection, always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage. 10) Regulation speciﬁcations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 11) Output noise may be further reduced by installing an external ﬁlter. Do not exceed the maximum output capacitance. At zero output current and no external capacitor, the output may contain low frequency components which exceed the ripple speciﬁcation. The output may be operated indeﬁnitely with no load.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 13 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC Efﬁciency vs. Line Voltage and Load Current @ +25˚C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (V in=15V to 36V) PERFORMANCE DATA – OKI-78SR-12/1.0-W36-C Output Ripple and Noise (Vin=15V, Vout=nominal, Iout=1A, Cload=0, Ta=+25˚C, ScopeBW=100MHz) Output Ripple and Noise (Vin=24V, Vout=nominal, Iout =1A, Cload=0, Ta=+25˚C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1A, Cload=0, Ta=+25˚C., ScopeBW=100MHz)

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 14 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA – OKI-78SR-12/1.0-W36-C Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=0.5A to 1.0A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=15V, Vout=nominal, Cload=0, Iout=1.0A to 0.5A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.0A to 0.5A, Slew=1A//uni03BCS, 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, Slew=1A//uni03BCS, 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=1.0A to 0.5A, Slew=1A//uni03BCS, Ta=+25˚C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div.

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 15 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- VERTICAL MOUNT 0.41 (10.4) 0.205 CL (5.2) REF 0.06 (1.5) REF 0.65 (16.5) Pin #1 0.100 (2.5) 0.200 (5.1) Pin #3 0.030±0.002 0.13 (3.3) 0.05 (1.3) Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise speciﬁed): .XX ± 0.02 (0.5) Angles ± 1˚ Components are shown for reference only. INPUT/OUTPUT CONNECTIONS OKI-78SR Pin Function

1 Positive Input

2 Common (Ground)

3 Positive Output

0.34 MAX (8.6) 0.18 MAX (4.6)

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 16 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- HORIZONTAL MOUNT 0.205 (5.2) REF 0.41 (10.4) CL 0.06 (1.5) REF 0.65 (16.5) .025 (0.635) (3 PLS) Pin #1 Pin #3 0.100 (2.5) 0.200 (5.1) (4.318) - .02 Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise speciﬁed): .XX ± 0.02 (0.5) Angles ± 1˚ Components are shown for reference only. INPUT/OUTPUT CONNECTIONS OKI-78SR Pin Function 0.34 MAX (8.6) 0.18 MAX (4.6)

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 17 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC RECOMMENDED FOOTPRINTS

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 18 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PACKAGING INFORMATION

www.murata -ps.com/support MDC_OKI-78SR-W36.C05 Page 20 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC Minimum Output Loading Requirements All models regulate within speciﬁcation and are stable u nder no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. Temperature Derating Curves The graphs in this data sheet illustrate typical operat ion under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airﬂow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airﬂow as long as the average is not exceeded. Note that the temperatures are of the ambient airﬂow, no t the converter 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 using fan-forced airﬂow. Depending on the application, “natural convection” is usually about 30-65 LFM but is not equal to still air (0 LFM). Murata Power Solutions makes Characterization measureme nts in a closed cycle wind tunnel with calibrated airﬂow. We use both thermocouples and an infrared camera system to observe thermal performance. As a practical matter, it is quite difﬁcult to insert an anemometer to precisely measure airﬂow in most applications. Sometimes it is possible to estimate the effective airﬂow if you thoroughly understand the enclosure geometry, entry/exit oriﬁce areas and the fan ﬂowrate speciﬁcations. CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter m ay have an unplanned O ver Temperature shut down. Also, these graphs are all collected at near Sea Level altitude. Be sure to reduce the derat- ing for higher altitude. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protec- 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 with the output. Output Current Limiting Current limiting inception is deﬁned as the point at which full power falls below the rated tolerance. See the Performance/Functional Speciﬁcations. Note par- ticularly that the output current may brieﬂy rise above its rated value in normal 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 too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the 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 shut down the PWM controller. Following a time-out period, the PWM will restart, causing the output voltage to begin rising to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. The “hiccup” system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. The system will automatically restore operation as soon as the short circuit condi- tion is removed. 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 Murata Power Solutions, Inc. 129 Flanders Road, Westborough, MA 01581 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ 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. © 201 7 Murata Power Solutions, Inc.

Product Information

I50115H specifications and overview.

Summary

Non-Isolated Switching Regulator DC-DC

Description

Non-Isolated Switching Regulator DC-DC

Source title I50115H Datasheet(PDF) - Murata Power Solutions Inc.

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