ULS 60-Watt Series www.murata-ps.com Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FEATURES Small footprint DC/DC converter, ideal for high current applications Typical unit Tiny 0.9" x 1.3" x 0.40" open frame package Industry standard DOSA "brick" format and pinout with surface mount option 36-75 Volts DC input range 2250 Volt Basic input/output isolation (48V models) Up to 66 Watts total output power with overtemperature shutdown High efficiency synchronous rectifier forward topology Stable no-load operation with no required external components Operating temperature range -40 to +85C with derating Certified to UL 60950-1, CSA-C22.2 No. 234, EN60950-1 safety approvals, 2nd Edition Extensive self-protection shut down features PRODUCT OVERVIEW The world of "brick" DC/DC converters has seen a steady size reduction. The ULS series makes another dramatic size shrink down to a "sixteenthbrick" width (0.9 inches) while still retaining up to 66 Watt output and full 2250 Volt DC isolation. The PC-board mount converter family accepts 36 to 75 Volts DC inputs and delivers fixed outputs regulated to within 0.2%. The ULS converters are ideal for datacom and telecom applications, cell phone towers, data centers, server farms and network repeaters. ULS outputs may be trimmed within 10% of nominal output while delivering fast settling to current step loads and no adverse effects from higher capacitive loads. Excellent ripple and noise specifications assure compatibility to circuits using CPU's, ASIC's, programmable logic and FPGA's. No minimum load is required. For systems requiring controlled startup/shutdown, an external remote On/Off control may use a switch, transistor or digital logic. Remote Sense inputs compensate for resistive line drops at high currents. Many self-protection features on the ULS series avoid both converter and external circuit hazards. These include input undervoltage lockout and overtemperature shutdown. The outputs current limit using the "hiccup" autorestart technique and the outputs may be short-circuited indefinitely. Additional features include output overvoltage and reverse conduction elimination. The synchronous rectifier forward topology yields high efficiency for minimal heat buildup and "no fan" operation. +SENSE (7) +Vin (1) +Vout (8) SWITCH CONTROL -Vout (4) -Vin (3) INPUT UNDER VOLTAGE, OVER TEMPERATURE, AND OUTPUT OVER VOLTAGE COMPARATORS PULSE TRANSFORMER PWM CONTROLLER OPTO ISOLATION -SENSE (5) REFERENCE ERROR AMP REMOTE ON/OFF CONTROL (2) Vout TRIM (6) Typical topology is shown Figure 1. Simplified Block Diagram For full details go to www.murata-ps.com/rohs REG.-Nr. D216 www.murata-ps.com/support MDC_ULS Series.B27 Page 1 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE M Output Input Root Model M IOUT Power R/N (mV pk-pk) N Regulation (max.) P VIN Nom. Range IIN, no load (A, max.) (W) (V) (V) (mA) Typ. Max. Line Load VOUT (V) ULS-3.3/20-D48N-C 3.3 20 66 70 120 0.1% 0.2% 48 36-75 ULS-5/12-D48N-C 5 12 60 50 80 0.125% 0.25% 48 ULS-12/5-D48N-C 12 5 60 80 120 0.125% 0.25% 48 Efficiency C76 Package IIN, full load (A) Min. Typ. 20 1.53 89% 90% 0.9x1.3x0.40 36-75 40 1.39 88% 90% 0.9x1.3x0.40 36-75 50 1.37 88% 91% 0.9x1.3x0.40 Case (inches) M Please refer to the Part Number Structure when ordering. I/O caps are necessary for our test equipment and may not be needed for your application. N These specifications are preliminary. Contact Murata Power Solutions for availability. Regulation specifications describe output voltage deviations from a nominal/midpoint value to either O All specifications are at nominal line voltage and full load, +25C unless otherwise noted. See detailed extreme (50% load step). specifications. Output capacitors are 1 F ceramic multilayer in parallel with 10 F electrolytic. PART NUMBER STRUCTURE ULS - 3.3 / 20 - D48 N M H Lx - C RoHS Hazardous Substance Compliance (does not claim EU RoHS exemption 7b-lead in solder) C = RoHS-6 Y = RoHS-5 Sixteenth Brick Series Nominal Output Voltage: Maximum Rated Output Current Current in Amps Input Voltage Range: D48 = 36-75 Volts (48V nominal) Pin Length Option (Thru-hole only) Blank = Standard pin length 0.180 (4.6mm) L1 = 0.110 (2.79mm)* L2 = 0.145 (3.68mm)* Conformal Coating: Blank = No coating, standard H = Coating added, optional special order SMT Version Blank = Through-hole mount, no SMT M = Surface mount (MSL Rating 3) On/Off Control Logic: N = Negative P = Positive *Special quantity order is required; no sample quantities available. Note: Some model number combinations may not be available. Please contact Murata Power Solutions. www.murata-ps.com/support MDC_ULS Series.B27 Page 2 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 Conditions Full power operation Operating or non-operating, tested: 100 mS max. duration Input to output None, install external fuse Power on, referred to -Vin ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Input Voltage, Transient Isolation Voltage Input Reverse Polarity On/Off Remote Control Output Power Minimum Typical/Nominal Maximum 80 Units Vdc 100 Vdc 2250 Vdc Vdc Vdc W None 0 0 15 66.66 Current-limited, no damage, 0 20 A short-circuit protected Storage Temperature Range Vin = Zero (no power) -55 125 C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 4 A Start-up threshold, turn on Rising input voltage 33.5 34.5 35.5 Vdc Falling input voltage 31.5 32.5 33.5 Vdc Undervoltage shutdown, turn off 12 Overvoltage protection NA Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type Capacitive Output Current Input current Full Load Conditions Low Line Inrush Transient Output in Short Circuit No Load input current Shut-Down Mode Input Current Reflected (back) ripple current Reflected (back) ripple current Vin = nominal Vin = minimum 1.53 2.08 0.05 150 30 5 150 20 The converter will start if the external load pre-bias does not exceed Vnom Iout = minimum, unit=ON no filtering Measured at input with specified filter External output voltage < Vset Pre-biased startup 1.56 2.15 300 100 15 210 30 A A A2-Sec. mA mA mA mAp-p mAp-p GENERAL and SAFETY Vin=48V, full load Vin=Min Efficiency 89 86 Isolation Isolation Voltage, input to output Insulation Safety Rating Isolation Resistance Isolation Capacitance Safety (meets the following requirements) Calculated MTBF Calculated MTBF 90 88 % % 2250 basic 100 1000 UL-60950-1, CSA-C22.2 No.60950-1, IEC/EN60950-1, 2nd Edition Per MIL-HDBK-217F, ground benign, Tambient=+40C Per Telcordia SR332, issue 1, class 3, ground fixed, Tambient=+40C Vdc M pF Yes TBD Hours x 103 3200 Hours x 103 DYNAMIC CHARACTERISTICS Fixed Switching Frequency Startup Time Startup Time 480 19 Dynamic Load Response Dynamic Load Peak Deviation Power on, Vout regulated Remote ON to Vout regulated 50-75-50% load step, settling time to within 1% of Vout. same as above 500 5 5 520 15 10 KHz mS mS 50 150 Sec 150 200 mV 1 0.8 15 2 V V mA FEATURES and OPTIONS Remote On/Off Control "N" suffix: Negative Logic, ON state Negative Logic, OFF state Control Current ON = Pin grounded or external voltage OFF = Pin open or external voltage open collector/drain -0.1 2.5 www.murata-ps.com/support MDC_ULS Series.B27 Page 3 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-3.3/20-D48 (CONT.) Conditions Minimum ON = Pin open or external voltage OFF = Ground pin or external voltage open collector/drain 3.5 0 FEATURES and OPTIONS (cont.) Remote On/Off Control (cont.) "P" suffix: Positive Logic, ON state Positive Logic, OFF state Control Current Typical/Nominal Maximum Units 1 15 1 2 V V mA 0 66 66.66 W 3.267 -1 -10 3.75 3.3 3.333 1 10 4.95 Vdc % of Vset 20 A 30 A OUTPUT Total Output Power Voltage Nominal Output Voltage 15 Settling Accuracy Output Voltage Range Overvoltage Protection Remote Sense Compensation Current Output Current Range Minimum Load Current Limit Inception 13 Short Circuit No trim At 50% load User-adjustable Via magnetic feedback Of Vset 18 0 98% of Vnom., cold condition Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Line Regulation Load Regulation Ripple and Noise Temperature Coefficient Maximum Capacitive Loading (10% ceramic, 90% Oscon) 22 4.25 10 20 No minimum load 26 Hiccup technique, autorecovery within 1% of Vout 6.6 Output shorted to ground, no damage Continuous Vdc % A Hiccup current limiting Vin=min. to max., Vout=nom., nom load Iout=min. to max 5 Hz- 20 MHz BW At all outputs 0.1 0.2 70 0.02 Low ESR, .02 ohms max (resistive load) 1000 F Cxx case WxLxH 1.3x0.9x0.4 33x22.9x10.2 0.58 16.4 .062 & .04 1.575 & 1.016 Gold-plated copper alloy with nickel underplate 50 5 Inches mm Ounces Grams Inches mm 120 V V mV pk-pk % of Vout./C MECHANICAL (Through Hole Models) Outline Dimensions (Please refer to outline drawing) Weight Through Hole Pin Diameter Through Hole Pin Material Nickel subplate Gold overplate TH Pin Plating Metal and Thickness -inches -inches ENVIRONMENTAL Operating Ambient Temperature Range 11 Storage Temperature Operating Case Temp Thermal Protection/Shutdown Electromagnetic Interference Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 RoHS rating No derating, full power, 200 LFM, no condensation Vin = Zero (no power) No derating required Measured at hotspot External filter is required -40 85 C -55 -40 110 125 120 120 C C C 115 B B RoHS-6 Class Class www.murata-ps.com/support MDC_ULS Series.B27 Page 4 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48 Efficiency vs. Line Voltage and Load Current @ 25C Maximum Current Temperature Derating at Sea Level (VIN = 48V, longitudinal airflow) 25 100 Output Current (Amps) 95 Efficiency (%) 90 85 VIN = 75V VIN = 48V VIN = 36V 80 75 20 Natural convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 15 10 5 70 0 65 30 60 3 4 6 8 10 12 14 16 18 20 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Load Current (Amps) (Resistive loads 50% with +25% step Vin=48V) Transient Response (Load from 75% to 50%) Transient Response (Load from 50% to 75%) Enable Start-up Enable Start-up (Vin=48V Iout=20A) Enable Start-up (Vin=48V Iout=0A) www.murata-ps.com/support MDC_ULS Series.B27 Page 5 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-3.3/20-D48 (CONT.) Ripple and Noise (1uF Ceramic and 10uF Tantalum Capcitors) R/N Waveform (Vin=48V Iout=20A) R/N Waveform (Vin=48V Iout=0A) www.murata-ps.com/support MDC_ULS Series.B27 Page 6 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48 Conditions Full power operation Operating or non-operating, tested: 100 mS max. duration Input to output None, install external fuse Power on, referred to -Vin ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Input Voltage, Transient Isolation Voltage Input Reverse Polarity On/Off Remote Control Output Power Minimum Typical/Nominal Maximum 80 Units Vdc 100 Vdc 2250 Vdc Vdc Vdc W None 0 0 15 60.6 Current-limited, no damage, 0 12 A short-circuit protected Storage Temperature Range Vin = Zero (no power) -55 125 C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 4 A Start-up threshold, turn on Rising input voltage 33 34.5 35.5 Vdc Falling input voltage 31 32.5 33.5 Vdc Undervoltage shutdown, turn off 12 Overvoltage protection NA Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type LC Output Current Input current Full Load Conditions Low Line Inrush Transient Output in Short Circuit No Load input current Shut-Down Mode Input Current Reflected (back) ripple current Reflected (back) ripple current Vin = nominal Vin = minimum 1.39 1.85 0.05 100 40 5 400 25 The converter will start if the external load pre-bias does not exceed Vnom Iout = minimum, unit=ON no filtering Measured at input with specified filter External output voltage < Vset Pre-biased startup 1.43 1.91 200 80 10 500 35 A A A2-Sec. mA mA mA mAp-p mAp-p GENERAL and SAFETY Vin=48V, full load Vin=Min Efficiency 88 88 Isolation Isolation Voltage, input to output Insulation Safety Rating Isolation Resistance Isolation Capacitance Safety (meets the following requirements) Calculated MTBF Calculated MTBF 90 90 % % 2250 basic 10 1000 UL-60950-1, CSA-C22.2 No.60950-1, IEC/EN60950-1, 2nd Edition Per MIL-HDBK-217F, ground benign, Tambient=+40C Per Telcordia SR332, issue 1, class 3, ground fixed, Tambient=+40C Vdc M pF Yes TBD Hours x 103 3200 Hours x 103 DYNAMIC CHARACTERISTICS Fixed Switching Frequency Startup Time Startup Time 19 Dynamic Load Response Dynamic Load Peak Deviation Power on, Vout regulated Remote ON to Vout regulated 50-75-50% load step, settling time to within 1% of Vout. same as above 400 10 10 20 20 KHz mS mS 50 100 Sec 200 250 mV 1 0.8 15 2 V V mA FEATURES and OPTIONS Remote On/Off Control "N" suffix: Negative Logic, ON state Negative Logic, OFF state Control Current ON = Pin grounded or external voltage OFF = Pin open or external voltage open collector/drain -0.1 2.5 www.murata-ps.com/support MDC_ULS Series.B27 Page 7 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-5/12-D48 (CONT.) Conditions Minimum ON = Pin open or external voltage OFF = Ground pin or external voltage open collector/drain 3.5 0 FEATURES and OPTIONS (cont.) Remote On/Off Control (cont.) "P" suffix: Positive Logic, ON state Positive Logic, OFF state Control Current Typical/Nominal Maximum Units 1 15 1 2 V V mA 0 60 60.6 W 4.95 -1 -10 6 5 5.05 1 10 7.2 Vdc % of Vset OUTPUT Total Output Power Voltage Nominal Output Voltage 15 Settling Accuracy Output Voltage Range Overvoltage Protection Remote Sense Compensation Current Output Current Range Minimum Load Current Limit Inception 13 Short Circuit No trim At 50% load User-adjustable Via magnetic feedback Of Vset 18 0 Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Line Regulation Load Regulation Ripple and Noise Temperature Coefficient Maximum Capacitive Loading (10% ceramic, 90% Oscon) Vdc % 12 No minimum load 16 12 A 19 A Hiccup technique, autorecovery within 1% of Vout 0.5 1 A Output shorted to ground, no damage Continuous 98% of Vnom., after warm up Short Circuit Current 6.5 10 14 Hiccup current limiting Vin=min. to max., Vout=nom., nom load Iout=min. to max 5 Hz- 20 MHz BW At all outputs 0.125 0.25 50 0.02 Low ESR, .02 ohms max (resistive load) 220 Cxx case WxLxH 1.3x0.9x0.4 33x22.9x10.2 0.58 16.4 .062 & .04 1.575 & 1.016 Gold-plated copper alloy with nickel underplate 50 5 100 1000 V V mV pk-pk % of Vout./C F MECHANICAL (Through Hole Models) Outline Dimensions (Please refer to outline drawing) Weight Through Hole Pin Diameter Through Hole Pin Material Nickel subplate Gold overplate TH Pin Plating Metal and Thickness Inches mm Ounces Grams Inches mm -inches -inches ENVIRONMENTAL Operating Ambient Temperature Range 11 Storage Temperature Operating Case Temp Thermal Protection/Shutdown Electromagnetic Interference Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 RoHS rating No derating, full power, 200 LFM, no condensation Vin = Zero (no power) No derating required Measured at hotspot External filter is required -40 85 C -55 -40 110 125 120 130 C C C 115 A A RoHS-6 Class Class www.murata-ps.com/support MDC_ULS Series.B27 Page 8 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-5/12-D48 Efficiency and Power Dissipation @ 25C Maximum Current Temperature Derating at Sea Level (VIN = 48V, airflow is from Vin to Vout) 90 10 85 9 VIN = 75V VIN = 48V VIN = 36V 80 75 8 7 70 6 65 5 60 Power Dissipation (Vin = 48V) 55 50 3.0 4 13 3 2 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 Output Current (Amps) 11 Power Dissipation (Watts) 12 95 Efficiency (%) 100 12 Natural convection 11 10 9 8 7 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Load Current (Amps) Enable Start-up (Vin=48V, Iout=12A, Ta=+25C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=0A, Ta=+25C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=12A, Cload=1000uF, Ta=+25C) Trace 2=Output, Trace 4= Enable. www.murata-ps.com/support MDC_ULS Series.B27 Page 9 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-5/12-D48 (CONT.) Output and Ripple Noise (Vin=48V, Iout=12A, 1uF Ceramic and 10uF tantalum capacitors) Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors) Transient Response (Vin=48V, Iout=50-75-50% of Imax) (Recovery time=9.6uS) Transient Response (Vin=48V, Iout=50-75-50% of Imax) (Recovery time=10uS) Transient Response (Vin=48V, Iout=50-75-50% of Imax) Thermal image with hot spot at full load with 85 C ambient; air is flowing at 400LFM. Air if flowing across the converter from +V to -V at 48V input. Identifiable and recommended value to be verified in application. (Q2, max temp=120 C/IPC9592 guidelines) www.murata-ps.com/support MDC_ULS Series.B27 Page 10 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48 Conditions Full power operation Operating or non-operating, tested: 100 mS max. duration Input to output None, install external fuse Power on, referred to -Vin ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Input Voltage, Transient Isolation Voltage Input Reverse Polarity On/Off Remote Control Output Power Minimum Typical/Nominal Maximum 80 Units Vdc 100 Vdc 2250 Vdc Vdc Vdc W None 0 0 15 60.6 Current-limited, no damage, 0 5 A short-circuit protected Storage Temperature Range Vin = Zero (no power) -55 125 C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied or recommended. INPUT Operating voltage range 36 48 75 Vdc Recommended External Fuse Fast blow 4 A Start-up threshold, turn on Rising input voltage 33 34.5 35.5 Vdc Falling input voltage 31 32.5 33.5 Vdc Undervoltage shutdown, turn off 12 Overvoltage protection NA Vdc Reverse Polarity Protection None, install external fuse None Vdc Internal Filter Type Capacitance Output Current Input current Full Load Conditions Low Line Inrush Transient Output in Short Circuit No Load input current Shut-Down Mode Input Current Reflected (back) ripple current Reflected (back) ripple current Vin = nominal Vin = minimum 1.37 1.83 0.05 100 50 15 150 15 The converter will start if the external load pre-bias does not exceed Vnom Iout = minimum, unit=ON no filtering Measured at input with specified filter External output voltage < Vset Pre-biased startup 1.43 1.89 200 150 25 200 30 A A A2-Sec. mA mA mA mAp-p mAp-p GENERAL and SAFETY Vin=48V, full load Vin=Min Efficiency 88 89 Isolation Isolation Voltage, input to output Insulation Safety Rating Isolation Resistance Isolation Capacitance Safety (meets the following requirements) Calculated MTBF Calculated MTBF 91 90 % % 2250 basic 100 1000 UL-60950-1, CSA-C22.2 No.60950-1, IEC/EN60950-1, 2nd Edition Per MIL-HDBK-217F, ground benign, Tambient=+40C Per Telcordia SR332, issue 1, class 3, ground fixed, Tambient=+40C Vdc M pF Yes TBD Hours x 103 3200 Hours x 103 DYNAMIC CHARACTERISTICS Fixed Switching Frequency Startup Time Startup Time 470 19 Dynamic Load Response Dynamic Load Peak Deviation Power on, Vout regulated Remote ON to Vout regulated 50-75-50% load step, settling time to within 1% of Vout. same as above 520 570 30 30 KHz mS mS 25 50 Sec 180 240 mV 1 0.8 15 2 V V mA FEATURES and OPTIONS Remote On/Off Control "N" suffix: Negative Logic, ON state Negative Logic, OFF state Control Current ON = Pin grounded or external voltage OFF = Pin open or external voltage open collector/drain -0.1 2.5 www.murata-ps.com/support MDC_ULS Series.B27 Page 11 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS, ULS-12/5-D48 (CONT.) Conditions Minimum ON = Pin open or external voltage OFF = Ground pin or external voltage open collector/drain 3.5 0 FEATURES and OPTIONS (cont.) Remote On/Off Control (cont.) "P" suffix: Positive Logic, ON state Positive Logic, OFF state Control Current Typical/Nominal Maximum Units 1 15 1 2 V V mA 0 60 60.6 W 11.88 -1 -10 13.3 12 12.12 1 10 18 Vdc % of Vset 5 A 8 A OUTPUT Total Output Power Voltage Nominal Output Voltage 15 Settling Accuracy Output Voltage Range Overvoltage Protection Remote Sense Compensation Current Output Current Range Minimum Load Current Limit Inception 13 Short Circuit No trim At 50% load User-adjustable Via magnetic feedback Of Vset 18 0 98% of Vnom., after warm up Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Line Regulation Load Regulation Ripple and Noise Temperature Coefficient Maximum Capacitive Loading (10% ceramic, 90% Oscon) Maximum Capacitive Loading 5.5 14.5 10 5 No minimum load 6.8 Hiccup technique, autorecovery within 1% of Vout 0.6 Output shorted to ground, no damage Continuous Vdc % A Hiccup current limiting Vin=min. to max., Vout=nom., nom load Iout=min. to max 5 Hz- 20 MHz BW At all outputs 0.125 0.25 80 0.02 Low ESR, .02 ohms max (resistive load) 1000 120 V V mV pk-pk % of Vout./C F loads: CC mode F MECHANICAL (Through Hole Models) Cxx case WxLxH Outline Dimensions (Please refer to outline drawing) 1.3x0.9x0.4 33x22.9x10.2 0.58 16.4 .062 & .04 1.575 & 1.016 Gold-plated copper alloy with nickel underplate 50 5 Weight Through Hole Pin Diameter Through Hole Pin Material Nickel subplate Gold overplate TH Pin Plating Metal and Thickness Inches mm Ounces Grams Inches mm -inches -inches ENVIRONMENTAL Operating Ambient Temperature Range 11 Storage Temperature Operating Case Temp Thermal Protection/Shutdown Electromagnetic Interference Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 RoHS rating No derating, full power, 200 LFM, no condensation Vin = Zero (no power) No derating required Measured at hotspot External filter is required -40 85 C -55 -40 115 125 105 130 C C C 125 B B RoHS-6 Class Class www.murata-ps.com/support MDC_ULS Series.B27 Page 12 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters Performance Specification Notes All specifications are typical unless noted. Ambient temperature = +25Celsius, VIN is nominal, output current is maximum rated nominal. External output capacitance is 1 F multilayer ceramic paralleled with 10 F electrolytic. All caps are low ESR. These capacitors are necessary for our test equipment and may not be needed in your application. Testing must be kept short enough that the converter does not appreciably heat up during testing. For extended testing, use plenty of airflow. See Derating Curves for temperature performance. All models are stable and regulate within spec without external cacacitance. Input Ripple Current is tested and specified over a 5-20 MHz bandwidth and uses a special set of external filters only for the Ripple Current specifications. Input filtering is CIN = 33 F, CBUS = 220 F, LBUS = 12 H. Use capacitor rated voltages which are twice the maximum expected voltage. Capacitors must accept high speed AC switching currents. Note that Maximum Current Derating Curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the converter will tolerate brief full current outputs if the average RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. Mean Time Before Failure (MTBF) is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, Issue 1, ground fixed conditions. Operating temperature = +30C, full output load, natural air convection. The output may be shorted to ground indefinitely with no damage. The Output Short Circuit Current shown in the specifications is an average consisting of very short bursts of full rated current to test whether the output circuit can be repowered. The On/Off Control is normally driven from a switch or relay. An open collector/open drain transistor may be used in saturation and cut-off (pinch-off) modes. External logic may also be used if voltage levels are fully compliant to the specifications. Regulation specifications describe the deviation as the input line voltage or output load current is varied from a nominal midpoint value to either extreme (50% load). Do not exceed maximum power ratings, Sense limits or output overvoltage when adjusting output trim values. At zero output current, Vout may contain components which slightly exceed the ripple and noise specifications. Output overload protection is non-latching. When the output overload is removed, the output will automatically recover. 11 All models are fully operational and meet published specifications, including "cold start" at -40C. 12 The converter will shut off if the input falls below the undervoltage threshold. It will not restart until the input exceeds the Input Start Up Voltage. 13 Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. 14 Output noise may be further reduced by installing an external filter. See the Application Notes. Use only as much output filtering as needed and no more. Larger caps (especially low-ESR ceramic types) may slow transient response or degrade dynamic performance. Thoroughly test your application with all components installed. 15 16 17 18 19 To avoid damage or unplanned shutdown, do not sink appreciable reverse output current. If reverse polarity is accidentally applied to the input, always connect an external fast blow input fuse in series with the +VIN input. Although extremely unlikely, failure of the internal components of this product may expose external application circuits to dangerous voltages, currents, temperatures or power levels. Please thoroughly verify all applications before committing them to service. Be sure to include appropriately rated FUSES (see specifications and Application Notes) to reduce the risk of failure. If Sense is not wired to an external load, connect sense pins to their respective Vout pins. Do not leave sense unconnected. All models use fixed switching frequencies. www.murata-ps.com/support MDC_ULS Series.B27 Page 13 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-12/5-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, airflow is from Vin to Vout) 12 95 11 90 10 9 85 80 8 VIN = 75V VIN = 48V VIN = 36V 75 70 7 6 5 65 60 Power Dissipation (Vin = 48V) 55 50 0.50 0.95 1.40 1.85 2.30 2.75 3.20 3.65 4.10 4.55 4 6 Output Current (Amps) 100 Loss (Watts) Efficiency (%) Efficiency and Power Dissipation vs. Line Voltage and Load Current @ 25C 5 4 Natural convection 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 3 2 1 3 2 5.00 0 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Load Current (Amps) Enable Start-up (Vin=48V, Iout=5A, Ta=+25C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=0A, Ta=+25C) Trace 2=Output, Trace 4= Enable. Enable Start-up (Vin=48V, Iout=5A, Cload=1000uF Ta=+25C) Trace 2=Output, Trace 4= Enable. www.murata-ps.com/support MDC_ULS Series.B27 Page 14 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TYPICAL PERFORMANCE DATA, ULS-12/5-D48 (CONT.) Output and Ripple Noise (Vin=48V, Iout=0A, 1uF Ceramic and 10uF tantalum capacitors) Output and Ripple Noise (Vin=48V, Iout=5A, 1uF Ceramic and 10uF tantalum capacitors) Transient Response (Vin=48V, Iout=50-75-50% of Imax) (Delta=170mv, Recovery time=16uS) Transient Response (Vin=48V, Iout=50-75-50% of Imax) (-Delta=183.12mV, Recovery time=18.2uS) Transient Response (Vin=48V, Iout=50-75-50% of Imax) Thermal image with hot spot at full load with 85 C ambient; air is flowing at 400LFM. Air if flowing across the converter from -V to +V at 48V input. Identifiable and recommended value to be verified in application. (Q2, max temp=120 C/IPC9592 guidelines) www.murata-ps.com/support MDC_ULS Series.B27 Page 15 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters MECHANICAL SPECIFICATIONS, THROUGH-HOLE MOUNT TOP VIEW Pin 3 2 1 INPUT/OUTPUT CONNECTIONS P75 Function Pin Function -Vin 4 -Vout 5 -Sense In On/Off Control 6 Trim 7 +Sense In +Vin 8 +Vout 0.136 0.005 0.030 (0.8) Min 0.145 0.400 (10.16) Max (3.68) Important! Always connect the sense pins. If they are not connected to a remote load, wire each sense pin to its respective voltage output at the converter pins. The 0.145-inch pin length is shown. Please refer to the part number structure for alternate pin lengths. Pin material: Copper alloy. Plating: Gold over nickel SIDE VIEW Please note that some competitive units may use different pin numbering or alternate outline views; however, all units are plugin-compatible. PINS 1-3,5-7: 0.0400.001(1.0160.025) 1.100 (27.9) PINS 4,8: 0.0620.001(1.5750.025) It is recommended that no parts be placed beneath the converter BOTTOM PIN VIEW 1.30 (33.0) END VIEW Dimensions are in inches (mm) shown for ref. only. 4 6 0.90 (22.9) 2 Third Angle Projection 0.300 (7.62) 5 0.600 (15.24) 0.600 (15.24) 3 7 Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 8 1 RECOMMENDED FOOTPRINT Components are shown for reference only and may vary between units. (VIEW THROUGH CONVERTER) TOP VIEW FINISHED HOLE SIZES @ PINS 1-3, 6, 5*, 7* (PRI) (PER IPC-D-275, LEVEL C) (SEC) 1.100 [27.94] .048-.062 22.9 .90 11.7 .46 CL 8 1 7.62 .300 7* 2 6 7.62 .300 5* 3 .100 MIN ANNULAR RING FOR ALL PIN SHOULDERS 3.81 .150 4 14.0 .55 CL 33 1.30 CL 3.81 .150 FINISHED HOLE SIZES @ PINS 4 & 8 (PER IPC-D-275, LEVEL C) .070-.084 www.murata-ps.com/support MDC_ULS Series.B27 Page 16 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT Anti-static foam Corner spacer 2 cartons per box ts 128 uni ts 79 ( 12. uni Each tray is 4 x 8 units (32 units total per tray) 6 (3 20) 11.42 (290) 13. ) 350 128 128 units per carton Label 256 units total per box All materials in contact with the units are anti-static protective. Dimensions are in inches (mm). Corrugated cardboard box Label SHIPPING TRAY DIMENSIONS Material: Low density, closed cell polyethylene anti-static foam 9.84 (250.00) 0.24 (6.00) 9.84 (250.00) 0.47 (12.00) 4-C 0.26 (6.5) 0.87 (22.00) 0.59 (15.00) Dimensions are in milimeters. 1 .3 R0 .00) (8 Tolerances (unless otherwise specified): .XX 0.5 .XXX 0.25 Angles 2 1.34 (34.00) 1.97 (50.00) 0.31 (8.00) 0.51 (13.00) 0.91 (23.00) Third Angle Projection www.murata-ps.com/support MDC_ULS Series.B27 Page 17 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters MECHANICAL SPECIFICATIONS, SURFACE MOUNT (MSL RATING 3). TOP VIEW Pin 3 2 1 INPUT/OUTPUT CONNECTIONS P75 Function Pin Function -Vin 4 -Vout 5 -Sense In On/Off Control 6 Trim 7 +Sense In +Vin 8 +Vout 0.400 (10.16) Max 0.150 (3.8) Important! Always connect the sense pins. If they are not connected to a remote load, wire each sense pin to its respective voltage output at the converter pins. Pin material: Copper alloy. Plating: Gold over nickel SIDE VIEW 0.020 (0.5) Min Please note that some competitive units may use different pin numbering or alternate outline views; however, all units are plugin-compatible. 0.062 (1.575) 1.100 1.100 (27.9) It is recommended that no parts be placed beneath the converter BOTTOM PIN VIEW 1.30 (33.0) END VIEW Dimensions are in inches (mm) shown for ref. only. 3 4 0.90 (22.9) 6 0.300 (7.62) 2 0.600 (15.24) 0.600 (15.24) Third Angle Projection 5 7 Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 8 1 RECOMMENDED FOOTPRINT Components are shown for reference only and may vary between units. (VIEW THROUGH CONVERTER) TOP VIEW (PRI) (SEC) 27.94 1.100 22.9 .90 11.7 .46 CL 3.81 .150 8 1 7.62 .300 7* 2 6 7.62 .300 5* 3 CL 4 3.81 .150 14.0 .55 CL 33 1.30 .070 MIN PAD (6 OR 8 PLACES AS REQUIRED) www.murata-ps.com/support MDC_ULS Series.B27 Page 18 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TAPE AND REEL INFORMATION [2.0] 0.079 Pin #1 6-8mm PICK-UP NOZZLE Feed (Unwind) Direction ---Round Holes 1.75 .069 [18.92] 0.745 44.00 1.732 32.00 1.260 PITCH Oblong Holes Top Cover Tape [9.65] .38 REF 330.20 13.00 TAPE AND REEL (200 UNITS PER REEL) 13.00 .512 101.60 4.00 CORE 44.0 1.73 REF 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_ULS Series.B27 Page 19 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. For DATEL ULS series DC/DC converters, we recommend the use of a fast blow fuse, installed in the ungrounded input supply line with a typical value about twice the maximum input current, calculated at low line with the converter's minimum efficiency. All relevant national and international safety standards and regulations must be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use safety standard. Input Reverse-Polarity Protection If the input voltage polarity is accidentally reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. I/O Filtering, Input Ripple Current, and Output Noise All models in the ULS Series are tested/specified for input reflected ripple current and output noise using the specified external input/output components/ circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from backplane to the DC/DC. Input caps should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of DC/DC converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific system configuration may necessitate additional considerations. TO OSCILLOSCOPE CURRENT PROBE +VIN LBUS + VIN CBUS CIN - Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, devices will not begin to regulate properly until the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once operating, devices will not turn off until the input voltage drops below the Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input is brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. Start-Up Time The VIN to VOUT Start-Up Time is the time interval between the point at which the ramping input voltage crosses the Start-Up Threshold and the fully loaded output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears at the converter. The ULS Series implements a soft start circuit to limit the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Control to VOUT start-up time assumes the converter has its nominal input voltage applied but is turned off via the On/Off Control pin. The specification defines the interval between the point at which the converter is turned on (released) and the fully loaded output voltage enters and remains within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also governed by the internal soft start circuitry and external load capacitance. The difference in start up time from VIN to VOUT and from On/Off Control to VOUT is therefore insignificant. Input Source Impedance The input of ULS converters must be driven from a low ac-impedance source. The DC/DC's performance and stability can be compromised by the use of highly inductive source impedances. The input circuit shown in Figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. For optimum performance, components should be mounted close to the DC/DC converter. -VIN CIN = 33F, ESR < 700m @ 100kHz CBUS = 220F, ESR < 100m @ 100kHz LBUS = 12H Figure 2. Measuring Input Ripple Current In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) may be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. They function as true filter elements and should be selected for bulk capacitance, low ESR and appropriate frequency response. All external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. Temperature variations for all relevant parameters should also be taken carefully into consideration. The most effective combination of external I/O capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. +SENSE +VOUT C1 C2 SCOPE RLOAD -VOUT -SENSE C1 = 1F C2 = 10F LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 3. Measuring Output Ripple/Noise (PARD) www.murata-ps.com/support MDC_ULS Series.B27 Page 20 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. Designers will normally use the -Output as the ground/ return of the load circuit. You can however, use the +Output as ground/return to effectively reverse the output polarity. Minimum Output Loading Requirements ULS converters employ a synchronous-rectifier design topology and all models regulate within spec and are stable under no-load to full load conditions. Operation under no-load conditions however might slightly increase the output ripple and noise. Thermal Shutdown The ULS converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC/DC converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. See Performance/Functional Specifications. Output Over-Voltage Protection The ULS output voltage is monitored for an over-voltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the PWM controller causing the output voltage to decrease. Following a time-out period the PWM will restart, causing the output voltage to ramp to its appropriate value. If the fault condition persists, and the output voltage again climbs to excessive levels, the over-voltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. Current Limiting As soon as the output current increases to approximately 130% of its rated value, the DC/DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point at which the full-power output voltage falls below the specified tolerance. See Performance/Functional Specifications. If the load current, being drawn from the converter, is significant enough, the unit will go into a short circuit condition as described below. 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, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The ULS Series is capable of enduring an indefinite short circuit output condition. Remote Sense Note: The Sense and VOUT lines are internally connected through low-value resistors. Nevertheless, if the sense function is not used for remote regulation the user should connect the +Sense to +VOUT and -Sense to -VOUT at the DC/ DC converter pins. ULS series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate IR drops in PCB conductors or cabling. The remote sense lines carry very little current and therefore require minimal cross-sectional-area conductors. The sense lines, which are capacitively coupled to their respective output lines, are used by the feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines on a PCB should be run adjacent to dc signals, preferably ground. [VOUT(+)-VOUT(-)] - [Sense(+)-Sense(-)] d 10%VOUT In cables and discrete wiring applications, twisted pair or other techniques should be used. Output over-voltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between VOUT and Sense in conjunction with trim adjustment of the output voltage can cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Power derating is based on maximum output current and voltage at the converter's output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating, or cause output voltages to climb into the output over-voltage region. Therefore, the designer must ensure: (VOUT at pins) x (IOUT) d rated output power Contact and PCB resistance losses due to IR drops +VOUT -VIN IOUT +SENSE Sense Current ON/OFF CONTROL TRIM LOAD Sense Return -SENSE IOUT Return +VIN -VOUT Contact and PCB resistance losses due to IR drops Figure 4. Remote Sense Circuit Configuration On/Off Control The input-side, remote On/Off Control function can be ordered to operate with either logic type: Positive ("P" suffix) logic models are enabled when the on/off pin is left open (or is pulled high, applying +3.5V to +15V with respect to -Input) as per Figure 5. Positive-logic devices are disabled when the on/off pin is pulled low (0 to 1V with respect to -Input). Negative ("N" suffix) logic devices are off when pin is left open (or pulled high, applying +2.5V to +15V), and on when pin is pulled low (-0.1 to +0.8V) with respect to -Input as shown in Figure 5. www.murata-ps.com/support MDC_ULS Series.B27 Page 21 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters Dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current (see Performance Specifications) when activated and withstand appropriate voltage when deactivated. Applying an external voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter. +VIN +Vcc 13V CIRCUIT ON/OFF CONTROL 5V CIRCUIT -VIN Figure 5. Driving the Negative Logic On/Off Control Pin (simplified circuit) OUTPUT VOLTAGE ADJUSTMENT Trim Equations RT DOWN (k:) = 5.11 +VOUT -VIN Trim Down - 10.22 +SENSE VOUT - VNOM Where _ _ VNOM ON/OFF CONTROL Trim Up RT UP (k:) = 5.11 x VNOM x (1 + ) TRIM LOAD RTRIM UP -SENSE - 1.225 x 5.11 - 10.22 +VIN VOUT - VNOM Where _ _ VNOM -VOUT Figure 6. Trim Connections To Increase Output Voltages Connect sense to its respective VOUT pin if sense is not used with a remote load. Note: "" is always a positive value. "VNOM" is the nominal, rated output voltage. "VOUT" is the desired, changed output voltage. +VOUT -VIN +SENSE ON/OFF CONTROL RTRIM DOWN TRIM LOAD -SENSE +VIN -VOUT Figure 7. Trim Connections To Decrease Output Voltages www.murata-ps.com/support MDC_ULS Series.B27 Page 22 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters Trimming by Using an External Voltage Source 1. The easiest way to trim the output using an external voltage source is to drive the Trim pin directly from a variable source. The following equation can be used to calculate the voltage at the Trim pin. Vtrim = 2 x 1.225 x Vo Vonominal - 1.225 Vo is the output voltage you want; Vonominal is the nominal output voltage; Vtrim is the voltage that should appear at the trim pin. 2. If the purpose of trimming is to compensate voltage drop of power path from converter to the Load, you may separately connect the sense pin directly to the load. It's much easier than real time adjusting trim voltage. +VIN +VOUT External source +SENSE ON/OFF CONTROL TRIM + - LOAD -SENSE -VIN -VOUT Figure 8. Trimming with an External Source 3. CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the maximum output voltage OR the maximum output power when setting the trim. If the output voltage is excessive, the OVP circuit may shut down the converter. If the maximum power is exceeded, the converter may enter current limiting. If the power is exceeded for an extended period, the converter may overheat and encounter overtemperature shut down. Be careful of external electrical noise. The Trim input is a sensitive input to the converter's feedback control loop. Excessive electrical noise may cause instability or oscillation. Through-hole Soldering Guidelines SMT Reflow Soldering Guidelines Murata Power Solutions recommends the TH soldering 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. The surface-mount reflow solder profile shown below is suitable for SAC305 type leadfree solders. This graph should be used only as a guideline. Many other factors influence the success of SMT reflow soldering. Since your production environment may differ, please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: Maximum Preheat Temperature 115 C. Maximum Pot Temperature 270 C. Maximum Solder Dwell Time 7 seconds For Sn/Pb based solders: Maximum Preheat Temperature 105 C. Maximum Pot Temperature 250 C. Maximum Solder Dwell Time 6 seconds www.murata-ps.com/support MDC_ULS Series.B27 Page 23 of 24 ULS 60-Watt Series Sixteenth-brick DOSA-Compatible, Isolated DC/DC Converters Vertical Wind Tunnel IR Transparent optical window Unit under test (UUT) Variable speed fan The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. IR Video Camera Heating element Precision low-rate anemometer 3" below UUT Ambient temperature sensor Airflow collimator Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airflow and heat dissipation analysis of power products. The system includes a precision low flow-rate anemometer, variable speed fan, power supply input and load controls, temperature gauges, and adjustable heating element. Both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow studies are possible by rotation of this carrier board since there are often significant differences in the heat dissipation in the two airflow directions. The combination of adjustable airflow, adjustable ambient heat, and adjustable Input/Output currents and voltages mean that a very wide range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent to the UUT by minimizing airflow turbulence. Such turbulence influences the effective heat transfer characteristics and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and fan, built-in temperature gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. Figure 9. Vertical Wind Tunnel Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 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) 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_ULS Series.B27 Page 24 of 24