OKI-78SR Series Non-Isolated Switching Regulator DC-DC New! 12V Model Typical units FEATURES PRODUCT OVERVIEW 7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout) Fabricated on a 0.41 x 0.65 inch (10.4 x 16.5 mm) Single Inline Package (SIP) module, the OKI78SR series are non-isolated switching regulator (SR) DC-DC power converters for embedded applications. 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. Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A Vertical SIP or horizontal mount, small footprint package "No heat sink" direct replacement for 3-terminal 78xx-series linear regulators High efficiency with no external components Short circuit protection Outstanding thermal derating performance UL/EN/IEC 60950-1, 2nd Edition safety approvals 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. Connection Diagram +Vin +Vout * Switching F1 Controller * Filters * Current Sense External DC Power Source Reference and Error Amplifier Common Common Figure 1. OKI-78SR Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 1 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output NEW IOUT (Amps Power max) (Watts) Root Model VOUT (Volts) OKI-78SR-3.3/1.5-W36-C 3.3 1.5 OKI-78SR-5/1.5-W36-C 5 OKI-78SR-12/1.0-W36-C 12 R/N (mVp-p) Input Regulation (Typ.) VIN Nom. Range (Volts) (Volts) IIN, IIN, no load full load (mA) (Amps) Max. Line Load 4.95 40 0.25% 0.40% 12 7-36 5 1.5 7.5 75 0.25% 0.40% 12 7-36 1.0 12 75 0.25% 0.25% 24 15-36 Efficiency Min. Typ. 0.48 84% 85.5% 5 0.69 89% 90.5% 5 0.53 93.5% 95.3% Package Inches (mm) 0.41 x 0.34 x 0.65 (10.4 x 8.64 x 16.5) 0.41 x 0.34 x 0.65 (10.4 x 8.64 x 16.5) 0.41 x 0.34 x 0.65 (10.4 x 8.64 x 16.5) NOTE: All specifications are at nominal line voltage, Vout = nominal and full load, +25C.with no external capacitor, unless otherwise noted. PART NUMBER STRUCTURE OKI - 78SR - 3.3 / 1.5 - W36 H - C RoHS-6 Hazardous Substance Compliance Okami Non-Isolated PoL Blank: Vertical Mount H Suffix: Horizontal Mount 78SR Series Maximum Rated Output in Volts Maximum Rated Output Current in Amps Input Voltage Range 7-36V (3.3 & 5Vo) 15-36V (12Vo) Note: Some model number combinations may not be available. Contact Murata Power Solutions. Product Label Because of the small size of these products, the product label contains a character-reduced code to indicate the model number and manufacturing date code. Not all items on the label are always used. Please note that the label differs from the product photograph on page 1. Here is the layout of the label: The label contains three rows of information: Mfg. date code XXXXXX Product code YMDX Rev. Revision level Figure 2. Label Artwork Layout First row - Murata Power Solutions logo Second row - Model number product code (see table) Third row - Manufacturing date code and revision level Model Number OKI-78SR-3.3/1.5-W36-C Product Code I33115 OKI-78SR-5/1.5-W36-C I50115 OKI-78SR-12/1.0-W36-C I12110 OKI-78SR-3.3/1.5-W36H-C I33115H OKI-78SR-5/1.5-W36H-C I50115H OKI-78SR-12/1.0-W36H-C I12110H The manufacturing date code is four characters: First character - Last digit of manufacturing year, example 2009 Second character - Month code (1 through 9 = Jan-Sep; O, N, D = Oct, Nov, Dec) Third character - Day code (1 through 9 = 1 to 9, 10 = 0 and 11 through 31 = A through Z) Fourth character - Manufacturing information www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 2 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS - OKI-78SR-3.3/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions Full power operation 0 36 Vdc Input Voltage, Continuous None, install external fuse None Vdc Input Reverse Polarity 0 5.15 W Output Power Current-limited, no damage, short-circuit protected 0 1.5 A Output Current Vin = Zero (no power) -55 125 C Storage Temperature Range 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 7 12 36 Vdc Operating voltage range Fast blow 2 A Recommended External Fuse None, install external fuse None Vdc Reverse Polarity Protection C-TYPE Internal Filter Type Input current 0.48 0.51 A Full Load Conditions Vin = nominal 0.80 0.85 A Low Line Vin @ min 0.16 A2-Sec. Inrush Transient 5 mA Short Circuit Input Current Vin = nominal 5 10 mA No Load Input Current 1 mA Shut-Down Mode Input Current (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 50 mA, pk-pk Reflected (back) ripple current 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 78.7 Hours x 106 Calculated MTBF fixed, Tambient=+25C DYNAMIC CHARACTERISTICS 500 kHz Fixed Switching Frequency 50-100-50% load step, settling time to within Dynamic Load Response 25 50 Sec 2% of Vout di/dt =1A/Sec same as above 100 150 mV Dynamic Load Peak Deviation 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 (CONT.) OUTPUT Total Output Power Voltage Nominal Output Voltage Range Setting Accuracy Output Voltage Overshoot - Startup: Current Output Current Range Minimum Load Current Limit Inception Short Circuit Mode Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Total Regulation Band Line Regulation Load Regulation Ripple and Noise (20MHz BW) Temperature Coefficient Maximum Capacitive Loading Maximum Capacitive Loading MECHANICAL Outline Dimensions Conditions At 50% load 98% of Vnom., after warmup @3.3Vout Minimum 0 Typical/Nominal 4.95 Maximum 5.15 Units W 3.168 -4 3.3 3.432 4 3 Vdc % of Vnom. %Vo nom 0 1.5 No minimum load 3.50 1.5 A 5.00 A 2.50 Hiccup technique, autorecovery within 1% of Vout 0.01 Output shorted to ground, no damage Continuous Current limiting Over all line, load and temp conditions Vin=min. to max. Vout=nom. Iout=min. to max. 3.3Vo, 12Vin At all outputs low ESR; >0.001, <0.01 ohm 0.01 ohm -3 Vo set 30 3 0.25 0.40 40 0.02 300 3300 0.41 x 0.65 x 0.34 10.4 x 16.5 x 8.64 0.07 2 copper alloy 100-300 75-150 Weight Pin Material Pin Finish A Matte Tin Nickel % Vo set % % mV pk-pk % of Vnom./C F F Inches mm Ounces Grams " " ENVIRONMENTAL Operating Ambient Temperature Range Storage Temperature RoHS Compliant see derating curves -40 85 C Vin = Zero (no power) -55 125 C RoHS-6 Specification Notes: 1) 2) 3) 4) 5) 6) 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.. Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 F, Cbus=1000 F, Lbus=1 H. All caps are low ESR types. 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. 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. The input and output are not isolated. They share a single COMMON power and signal return. 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) 8) 9) 10) 11) The output is not intended to sink appreciable reverse current. "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. 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. Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 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 4 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA - OKI-78SR-3.3/1.5-W36-C Efficiency vs. Line Voltage and Load Current @ +25C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 2.00 100 90 80 VIN = 7V VIN = 12V VIN = 36V 60 Output Current (Amps) Efficiency (%) 70 50 40 30 0.33 m/s (65 LFM) 1.00 20 10 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Load Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) 0.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 5 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/S, Ta=+25C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 6 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS - OKI-78SR-5/1.5-W36-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions Full power operation 0 36 Vdc Input Voltage, Continuous None, install external fuse None Vdc Input Reverse Polarity 0 7.80 W Output Power Current-limited, no damage, short-circuit protected 0 1.5 A Output Current Vin = Zero (no power) -55 125 C Storage Temperature Range 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 7 12 36 Vdc Operating voltage range Fast blow 2 A Recommended External Fuse None, install external fuse None Vdc Reverse Polarity Protection C-TYPE Internal Filter Type Input current 0.69 0.73 A Full Load Conditions Vin = nominal 1.16 1.22 A Low Line Vin @ min 0.16 A2-Sec. Inrush Transient 5 mA Short Circuit Input Current Vin = nominal 5 10 mA No Load Input Current 1 mA Shut-Down Mode Input Current (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 15 mA, pk-pk Reflected (back) ripple current 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 78.7 Hours x 106 Calculated MTBF fixed, Tambient=+25C DYNAMIC CHARACTERISTICS 500 kHz Fixed Switching Frequency 50-100-50% load step, settling time to within Dynamic Load Response 50 75 Sec 2% of Vout di/dt =1A/Sec same as above 150 200 mV Dynamic Load Peak Deviation 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 (CONT.) OUTPUT Total Output Power Voltage Nominal Output Voltage Range Setting Accuracy Output Voltage Overshoot - Startup: Current Output Current Range Minimum Load Current Limit Inception Short Circuit Mode Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Total Regulation Band Line Regulation Load Regulation Ripple and Noise (20MHz BW) Temperature Coefficient Maximum Capacitive Loading Maximum Capacitive Loading MECHANICAL Outline Dimensions Conditions At 50% load 98% of Vnom., after warmup @5Vout Minimum 0 Typical/Nominal 7.5 Maximum 7.8 Units W 4.8 -4 5.0 5.2 4 3 Vdc % of Vnom. %Vo nom 0 1.5 No minimum load 3.50 1.5 A 5.00 A 2.50 Hiccup technique, autorecovery within 1% of Vout 0.01 Output shorted to ground, no damage Continuous Current limiting Over all line, load and temp conditions Vin=min. to max. Vout=nom. Iout=min. to max. 5Vo, 12Vin At all outputs low ESR; >0.001, <0.01 ohm 0.01 ohm -3 Vo set 50 3 0.25 0.40 75 0.02 300 3300 0.41 x 0.65 x 0.34 10.4 x 16.5 x 8.64 0.07 2 copper alloy 100-300 75-150 Weight Pin Material Pin Finish A Matte Tin Nickel % Vo set % % mV pk-pk % of Vnom./C F F Inches mm Ounces Grams " " ENVIRONMENTAL Operating Ambient Temperature Range Storage Temperature RoHS Compliant see derating curves -40 85 C Vin = Zero (no power) -55 125 C RoHS-6 Specification Notes: 1) 2) 3) 4) 5) 6) 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.. Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 F, Cbus=1000 F, Lbus=1 H. All caps are low ESR types. 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. 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. The input and output are not isolated. They share a single COMMON power and signal return. 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) 8) 9) 10) 11) The output is not intended to sink appreciable reverse current. "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. 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. Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 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 8 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA - OKI-78SR-5/1.5-W36-C Efficiency vs. Line Voltage and Load Current @ +25C. (Vout = Vnom.) Maximum Current Temperature Derating at sea level (Vin=7V to 36V) 2.00 100 90 80 Efficiency (%) Output Current (Amps) VIN = 7V VIN = 12V 70 VIN = 36V 60 50 40 30 0.33 m/s (65 LFM) 1.00 20 10 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Load Current (Amps) Output Ripple and Noise (Vin=7V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) 0.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Output Ripple and Noise (Vin=12V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1.5A, Cload=0, Ta=+25C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 9 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/S, Ta=+25C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. Step Load Transient Response (Vin=7V, Vout=nominal, Cload=0, Iout=1.5A to 0.75A, Slew=1A/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 10 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC FUNCTIONAL SPECIFICATIONS - OKI-78SR-12/1.0-W36-C ABSOLUTE MAXIMUM RATINGS Minimum Typical/Nominal Maximum Units Conditions Full power operation 0 36 Vdc Input Voltage, Continuous None, install external fuse None Vdc Input Reverse Polarity 0 5.15 W Output Power Current-limited, no damage, short-circuit protected 0 1.0 A Output Current Vin = Zero (no power) -55 125 C Storage Temperature Range 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 15 24 36 Vdc Operating voltage range Fast blow 2 A Recommended External Fuse None, install external fuse None Vdc Reverse Polarity Protection C-TYPE Internal Filter Type Input current 0.53 0.56 A Full Load Conditions Vin = nominal 0.84 0.87 A Low Line Vin @ min 0.16 A2-Sec. Inrush Transient 5 mA Short Circuit Input Current Vin = nominal 5 10 mA No Load Input Current 1 mA Shut-Down Mode Input Current (Cin = 2 X 100uF, CBus = 1000uF, LBus = 1uH) 30 mA, pk-pk Reflected (back) ripple current 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 25.9 Hours x 106 Calculated MTBF fixed, Tambient=+25C DYNAMIC CHARACTERISTICS 500 kHz Fixed Switching Frequency 50-100-50% load step, settling time to within Dynamic Load Response 50 75 Sec 2% of Vout di/dt =1A/Sec same as above 165 225 mV Dynamic Load Peak Deviation 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 (CONT.) OUTPUT Total Output Power Voltage Nominal Output Voltage Range Setting Accuracy Output Voltage Overshoot - Startup: Current Output Current Range Minimum Load Current Limit Inception Short Circuit Mode Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Total Regulation Band Line Regulation Load Regulation Ripple and Noise (20MHz BW) Temperature Coefficient Maximum Capacitive Loading Maximum Capacitive Loading MECHANICAL Outline Dimensions Conditions At 50% load 98% of Vnom., after warmup @12Vout Minimum 0 Typical/Nominal 12.0 Maximum 12.5 Units W 11.52 -4 12.0 12.48 4 3 Vdc % of Vnom. %Vo nom 0 1.0 No minimum load 3.50 1.0 A 5.00 A 2.50 Hiccup technique, autorecovery within 1% of Vout 0.01 Output shorted to ground, no damage Continuous Current limiting Over all line, load and temp conditions Vin=min. to max. Vout=nom. Iout=min. to max. 12Vo, 24Vin At all outputs low ESR; >0.001, <0.01 ohm 0.01 ohm -3 Vo set 3 0.25 0.40 75 50 0.02 300 3300 0.41 x 0.65 x 0.34 10.4 x 16.5 x 8.64 0.07 2 copper alloy 100-300 75-150 Weight Pin Material Pin Finish A Matte Tin Nickel % Vo set % % mV pk-pk % of Vnom./C F F Inches mm Ounces Grams " " ENVIRONMENTAL Operating Ambient Temperature Range Storage Temperature RoHS Compliant see derating curves -40 85 C Vin = Zero (no power) -55 125 C RoHS-6 Specification Notes: 1) 2) 3) 4) 5) 6) 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.. Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 100 F, Cbus=1000 F, Lbus=1 H. All caps are low ESR types. 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. 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. The input and output are not isolated. They share a single COMMON power and signal return. 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) 8) 9) 10) 11) The output is not intended to sink appreciable reverse current. "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. 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. Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. 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 12 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PERFORMANCE DATA - OKI-78SR-12/1.0-W36-C Efficiency vs. Line Voltage and Load Current @ +25C. (Vout = Vnom.) Output Ripple and Noise (Vin=15V, Vout=nominal, Iout=1A, Cload=0, Ta=+25C, ScopeBW=100MHz) Maximum Current Temperature Derating at sea level (Vin=15V to 36V) Output Ripple and Noise (Vin=24V, Vout=nominal, Iout=1A, Cload=0, Ta=+25C., ScopeBW=100MHz) Output Ripple and Noise (Vin=36V, Vout=nominal, Iout=1A, Cload=0, Ta=+25C., ScopeBW=100MHz) www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 13 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) 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/S, Ta=+25C.) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 0.5A/div. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 14 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC MECHANICAL SPECIFICATIONS -- VERTICAL MOUNT 0.41 (10.4) 0.205 (5.2) REF CL 0.34 MAX (8.6) 0.18 MAX (4.6) 0.06 (1.5) REF 0.65 (16.5) Pin #3 0.13 (3.3) Pin #1 0.0300.002 0.100 (2.5) 0.05 (1.3) 0.200 (5.1) Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 INPUT/OUTPUT CONNECTIONS OKI-78SR Pin 1 2 3 Function Positive Input Common (Ground) Positive Output 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 1 Components are shown for reference only. 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 -- HORIZONTAL MOUNT 0.41 (10.4) 0.205 (5.2) REF 0.65 (16.5) Pin #1 0.100 (2.5) CL 0.34 MAX (8.6) 0.18 MAX (4.6) 0.06 (1.5) REF .025 (0.635) (3 PLS) Pin #3 0.17 +.01 (4.318) - .02 .05 (1.3).01 0.200 (5.1) Pin #1 PIN MATERIAL: COPPER ALLOY PIN FINISH: PURE MATTE TIN 100-300 u" OVER 75-150 u" NICKEL Pin #1 INPUT/OUTPUT CONNECTIONS OKI-78SR Pin 1 2 3 Function Positive Input Common (Ground) Positive Output 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 1 Components are shown for reference only. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 16 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC RECOMMENDED FOOTPRINTS www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 17 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC PACKAGING INFORMATION www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 18 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. For greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. 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. Recommended Input Filtering The user must assure that the input source has low AC impedance to provide 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 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 F, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. More input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. Recommended Output Filtering The converter will achieve its rated output ripple and noise with no additional external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. Initial values of 10 to 47 F may be tried, either single or multiple capacitors in parallel. Mount these close to the converter. Measure the output ripple under your load conditions. TO OSCILLOSCOPE CURRENT PROBE +VIN VIN + - + - LBUS CBUS CIN -VIN CIN = 2 x 100F, ESR < 700m @ 100kHz CBUS = 1000F, ESR < 100m @ 100kHz LBUS = 1H Figure 3 Measuring Input Ripple Current +VOUT C1 C2 SCOPE RLOAD -VOUT C1 = 1F C2 = 10F LOAD 2-3 INCHES (51-76mm) FROM MODULE 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 capacitance 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 components, 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-W36.C05 Page 19 of 20 OKI-78SR Series Non-Isolated Switching Regulator DC-DC Minimum Output Loading Requirements All models regulate within specification and are stable under 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 operation 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, not 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). Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protection. 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 particularly 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. Murata Power Solutions makes Characterization measurements 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. 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 (approximately 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. CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected at near Sea Level altitude. Be sure to reduce the derating for higher altitude. 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 condition 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 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. 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. (c) 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_OKI-78SR-W36.C05 Page 20 of 20