UCR100 Series www.murata-ps.com 3U High Reliability DC-DC Converters OBSOLETE PRODUCT Typical unit FEATURES PRODUCT OVERVIEW 16.8 to 137.5 VDC wide input voltage range Housed in a 3U x 4TE x 165.5 mm extruded aluminum cassette module suitable for 19-inch rack mounting, the UCR series of isolated 100 Watt DC-DC converters provide clean DC output power over a very wide input voltage range. The standard input range is 16.8 to 137.5 Volts DC with transient capability between 14.4V and 154V. The reverse-polarity protected input is immune to surges and transients per EN50155, IEC60571 and RIA12 standards. The double reinforced insulation system protects over the full power and temperature range in compliance with IEC/EN/UL60950-1 and EN50116. The UCR series is ideal for battery and mobile distributed power applications in transportation, industrial, vehicles, signal systems, communications and railways. The fixed output voltage is fully regulated with excellent noise, ripple and transient settling characteristics. Isolation characteristics are 2250 Volts DC (1500 VAC) input to output and input to case. Fixed 5.1, 12 or 24VDC unipolar output up to 120 Watts 3U x 4TE x 165.5mm (111 x 20.3 x 165.5 mm) cassette module for 19-inch rack mounting Ruggedized "no fans" high reliability enclosure with conformal coated components Extensive self-protection, over temperature and short circuit features On/Off control, sense, current share, output OK LED, UV lockout, Hold-up Cap and trim (some functions optional) Adjustable input undervoltage (UVLO) protection, optional 2250VDC/1500VAC I/O isolation plus RoHS-6 compliance Operating temperature range -40 to +85 Celsius Extensive EU transportation and railway standards adherence The ruggedized 3U housing features conformal coating of internal components for moisture resistance. The high efficiency design requires no forced cooling since all internal power dissipation is routed to integral extruded aluminum chassis rails. The enclosure may also be mounted against a cold plate inside a sealed chassis in conduction cooling applications. The UCR series is designed to comply with numerous environmental, EMC/EMI and safety standards (see specifications). Protection systems include output overcurrent and short circuit, over temperature shutdown (with automatic recovery) and output overvoltage. An industry-standard DIN H15 rear connector is used. All models are equipped with an On/Off control, sense inputs, and output voltage trim (10 %). Optional features include output OK LED lamp and control signal, active current sharing with other UCR's, external capacitor for extended hold-up time, and adjustable input undervoltage lockout. +H-UP CAP UVLO Trim 22 +Vout OK or H-UP * On/Off 28 Primary Control Circuitry Feedback Circuit Murata Power Solutions recommends an external fuse, F1. See page 17 for details. 24 -Vout OK or UVLO * Secondary Control Circuitry 18 Current Share* 16 Trim 12 +Sense F1 +Vin 4 +Vout 30 External DC Power Source Input Filter Secondary Synchronous Rectifiers Primary Switches 6 +Vout Output Filter 8 -Vout 32 10 -Vout -Vin Cy 26 14 -Sense Cy Isolation 20 Not connected *Please see ordering guide for optional features For full details go to www.murata-ps.com/rohs Figure 1. UCR Block Diagram www.murata-ps.com/support MDC_UCR100.C02 Page 1 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Root Model Number Input Vout Iout Power R/N (mV p-p) Regulation (max.) Vin nom. Range (Volts DC) (Amps,max.) (Watts) Typ. Max. Line Load (Volts DC) (Volts) Efficiency Pwr, no Iin, full load load (W) (Amps) Min. Typ. Dimensions Inches mm UCR100-050-T72-C 5.1 20 100 20 80 0.25% 0.25% 72 16.8-137.5 3 1.61 85.0% 87% 4.38x0.81x6.52 111x20.3x165.5 UCR100-120-T72-C 12 10 120 50 75 0.25% 0.25% 72 16.8-137.5 3.5 1.99 84.5% 86.5% 4.38x0.81x6.52 111x20.3x165.5 UCR100-240-T72-C 24 5.5 132 100 150 0.25% 0.25% 72 16.8-137.5 3.5 2.11 These are not complete model numbers. Please refer to the Part Number Structure for ordering information of all options. Measured at nominal line voltage and max load, +25C ambient temperature, sense lines connected. 88% 90% 4.38x0.81x6.52 111x20.3x165.5 This is the standard input range. The transient input range (0.1 seconds) is 14.4V to 154V. PART NUMBER STRUCTURE UCR 100 - 120 - T72 - SV - C RoHS-6/6 Compliant Series Output Power1 Nominal Output Voltage 050 = 5.1Vdc 120 = 12Vdc 240 = 24Vdc Nominal Input Voltage Range T72 = 16.8V-137.5Vdc Option Package Blank = Standard option (remote on/off, remote sense, I/O OK LED indicator and Vout Trim) S = Standard option plus current sharing and Vout OK signals V = Standard option plus Hold-up connection and UVLO SV = Standard option plus current sharing, Hold-up and UVLO Please refer to the wattage rating in the Ordering Guide section of the data sheet. Current sharing is not available on the 24V output models. External capacitor is required. TABLE 1. OPTIONS PART NUMBER CURRENT SHARE UVLO HOLD-UP Vout OK UCR100-050-T72-C UCR100-050-T72-S-C UCR100-050-T72-SV-C UCR100-050-T72-V-C UCR100-120-T72-C UCR100-120-T72-S-C UCR100-120-T72-SV-C UCR100-120-T72-V-C UCR100-240-T72-C UCR100-240-T72-V-C www.murata-ps.com/support MDC_UCR100.C02 Page 2 of 20 UCR100 Series 3U High Reliability DC-DC Converters FUNCTIONAL SPECIFICATIONS, UCR100-050-T72 INPUT Operating voltage range, standard Surge and Transient Protection Input Limits, no damage Input Filter Reverse Polarity Protection Start-up threshold Undervoltage shutdown Overvoltage shutdown Input current/power Full Load Current Peak Inrush Current Short Circuit Input Current No Load Input Power Low Line Input Current Shutdown Mode Input Current Reflected (back) ripple current GENERAL and SAFETY Efficiency Switching Frequency Turn-On Time Isolation Voltage Isolation Voltage Subassemblies pre-tested per EN50116/60950 Isolation Safety Rating Isolation Resistance Isolation Capacitance Safety (Designed to meet the following requirements) Calculated MTBF OUTPUT Total Output Power Voltage Output Voltage Range Setting Accuracy Overvoltage Protection Vout Adjustment Range <optional> Current Output Current Range Current Limit Inception Short Circuit Current Short Circuit Duration Short circuit protection method Line Regulation Load Regulation Dynamic Load Response Ripple and Noise, 1 & 10 F output Temperature Coefficient Maximum Output Capacitance Conditions/Comments Minimum 16.8 Per EN50155, IEC60571 and RIA12 Operating or non-operating Per EN50155, Symmetrical combined with VDR/transorb Yes, in conjunction with external fuse. Typical/Nominal 72 Maximum 137.5 Units Vdc 154 Vdc 14.6 12.3 170 16.4 14.0 Vdc Vdc Vdc Vdc 1.30 40 0.05 3.0 5.89 5 5 1.67 0 12.8 10.5 50% load 50% load Iout = minimum Vin = minimum Vin = nom., 16A load Vin = 110V, 16A load Vin = 24V, 16A load 85 85 81 90 Vin on to Vout regulated Remote ON to Vout regulated Input to output, case and aux. test Case to output and Aux. test voltage 87 86.5 82.5 100 150 150 0.1 3.5 7.57 10 10 110 160 160 2250 2250 4200 Based on 250 VAC or 240 VDC I/O Amps Amps Amps Watts Amps mA mA pk-pk % % % KHz mS mS Vdc Vdc Vdc Double/Reinforced 100 Mohm pF 4000 UL-60950-1, (2nd Edition), CSA-C22.2 No.60950-1, IEC/EN60950-1 per MIL-HDBK-217F Ground benign, Tcase = 40C Ground benign, Tcase = 40/70C Ground benign, Tcase = 50C Yes TBC TBC TBC Hours Hours Hours Full temperature range 0.0 81.6 103.02 Watts Vout = nominal 50% load magnetic feedback 5.049 5.1 1 6.2 5.151 6.5 10 Vdc % of Vnom. Vdc % of Vnom. Vin = 16.8-137.5V. 98% of Vnom., after warmup Hiccup technique, autorecovery within 1% of Vout Output shorted to ground Current limiting, hiccup autorestart Vin = min. to max. Vout = nom. Iout = min. to max. 50-75-50% load step settling time to within 1% of Vout Peak deviation 5 Hz- 20 MHz BW At all outputs ESR 0.02 min., resistive load 0.0 24 16 26.35 20 28.70 Amps Amps 0.5 1 Amps 0.25 % of Vnom. 0.25 150 % of Vnom. Sec 250 80 mV mV pk-pk % of Vnom./C F Notes Unless otherwise noted, units are specified with 1F ceramic and 10F tantalum external output capacitors in parallel (low ESR). The external input capacitor is 33F, low ESR. 5.9 -10 Continuous 75 200 20 0.02 6600 Undervoltage shutdown is also available as a user-adjustable option. Back ripple current input filter is Cin=33F, Cbus=220F, Lbus=12H Remove overload for recovery Output may be shorted to ground with no damage. www.murata-ps.com/support MDC_UCR100.C02 Page 3 of 20 UCR100 Series 3U High Reliability DC-DC Converters FUNCTIONAL SPECIFICATIONS, UCR100-120-T72 INPUT Operating voltage range, standard Surge and Transient Protection Input Limits, no damage Input Filter Reverse Polarity Protection Start-up threshold Undervoltage shutdown Overvoltage shutdown Input current/power Full Load Current Peak Inrush Current Short Circuit Input Current No Load Input Power Low Line Input Current Shutdown Mode Input Current Reflected (back) ripple current GENERAL and SAFETY Efficiency Switching Frequency Turn-On Time Isolation Voltage Isolation Voltage Subassemblies pre-tested per EN50116/60950 Isolation Safety Rating Isolation Resistance Isolation Capacitance Safety (Designed to meet the following requirements) Calculated MTBF Conditions/Comments Minimum 16.8 Per EN50155, IEC60571 and RIA12 Operating or non-operating Per EN50155, Symmetrical combined with VDR/transorb Yes, in conjunction with external fuse Typical/Nominal 72 Maximum 137.5 Units Vdc 154 Vdc 15.0 12 170 16.3 14.8 Vdc Vdc Vdc Vdc 1.54 40 0.05 3.5 7.05 5 5 1.99 0 11.5 10.3 50% load 50% load Iout = minimum Vin = minimum Vin = nom., 8A load Vin = 110V, 8A load Vin = 24V, 8A load 84.5 86 77 90 Vin on to Vout regulated Remote ON to Vout regulated Input to output, case and aux. test Case to output and Aux. test voltage 86.5 87.5 81 100 150 150 0.1 4.5 9.37 10 10 110 160 160 2250 2250 4200 Based on 250 VAC or 240 VDC I/O % % % KHz mS mS Vdc Vdc Vdc Double/Reinforced 100 Mohm pF 4000 UL-60950-1, (2nd Edition), CSA-C22.2 No.60950-1, IEC/EN60950-1 per MIL-HDBK-217F Ground benign, Tcase = 40C Ground benign, Tcase = 40/70C Ground benign, Tcase = 50C OUTPUT Total Output Power Voltage Output Voltage Range Setting Accuracy Overvoltage Protection Vout Adjustment Range <optional> Current Output Current Range Current Limit Inception Amps Amps Amps Watts Amps mA mA pk-pk Yes TBC TBC TBC Hours Hours Hours Full temperature range 0.0 96 121.2 Watts Vout = nominal 50% load magnetic feedback 11.88 12.0 1 14.4 12.12 15 10 Vdc % of Vnom. Vdc % of Vnom. 8.0 16 10.0 18 Amps Amps 0.5 1 Amps 0.25 % of Vnom. 0.25 200 % of Vnom. Sec 250 75 mV mV pk-pk % of Vnom./C F 13.5 -10 Vin = 16.8-137.5V. 98% of Vnom., after warmup Hiccup technique, autorecovery within 1% Short Circuit Current of Vout Short Circuit Duration Output shorted to ground Short circuit protection method Current limiting, hiccup autorestart Line Regulation Vin = min. to max. Vout = nom. Load Regulation Iout = min. to max. Dynamic Load Response 50-75-50% load step settling time to within 1% of Vout Peak deviation Ripple and Noise, 1 & 10 F output capacitors 5 Hz- 20 MHz BW Temperature Coefficient At all outputs Maximum Output Capacitance ESR 0.02 min., resistive load Notes Unless otherwise noted, units are specified with 1F ceramic and 10F tantalum external output capacitors in parallel (low ESR). The external input capacitor is 33F, low ESR. 0.0 14 Continuous 100 200 50 0.02 3300 Undervoltage shutdown is also available as a user-adjustable option. Back ripple current input filter is Cin=33F, Cbus=220F, Lbus=12H Remove overload for recovery Output may be shorted to ground with no damage. www.murata-ps.com/support MDC_UCR100.C02 Page 4 of 20 UCR100 Series 3U High Reliability DC-DC Converters FUNCTIONAL SPECIFICATIONS, UCR100-240-T72 INPUT Operating voltage range, standard Surge and Transient Protection Input Limits, no damage Input Filter Reverse Polarity Protection Start-up threshold Undervoltage shutdown Overvoltage shutdown Input current/power Full Load Current Peak Inrush Current Short Circuit Input Current No Load Input Power Low Line Input Current Shutdown Mode Input Current Reflected (back) ripple current GENERAL and SAFETY Efficiency Switching Frequency Turn-On Time Isolation Voltage Isolation Voltage Subassemblies pre-tested per EN50116/60950 Isolation Safety Rating Isolation Resistance Isolation Capacitance Safety (Designed to meet the following requirements) Calculated MTBF OUTPUT Total Output Power Voltage Output Voltage Range Setting Accuracy Overvoltage Protection Vout Adjustment Range <optional> Current Output Current Range Current Limit Inception Short Circuit Current Short Circuit Duration Short circuit protection method Line Regulation Load Regulation Dynamic Load Response Ripple and Noise, 1 & 10 F output Temperature Coefficient Maximum Output Capacitance Conditions/Comments Minimum 16.8 Per EN50155, IEC60571 and RIA12 Operating or non-operating Per EN50155, Symmetrical combined with VDR/transorb Supplied standard Typical/Nominal 72 0 11.5 10.5 50% load 50% load Yes 13.9 12.7 170 1.63 40 0.25 3.5 7.76 5 5 Iout = minimum Vin = minimum Vin = nom., 4.4A load Vin = 110V, 4.4A load Vin = 24V, 4.4A load 88 86.5 79 90 Vin on to Vout regulated Remote ON to Vout regulated Input to output, case and aux. test Case to output and Aux. test voltage 90 88.5 81 100 150 150 Maximum 137.5 Units Vdc 154 Vdc 16.3 14.8 Vdc Vdc Vdc Vdc 2.11 0.35 4.5 10.09 10 10 110 160 160 2250 2250 4200 Based on 250 VAC or 240 VDC I/O Amps Amps Amps Watts Amps mA mA pk-pk % % % KHz mS mS Vdc Vdc Vdc Double/Reinforced 100 Mohm pF 4000 UL-60950-1, (2nd Edition), CSA-C22.2 No.60950-1, IEC/EN60950-1 per MIL-HDBK-217F Ground benign, Tcase = 40C Ground benign, Tcase = 40/70C Ground benign, Tcase = 50C Yes TBC TBC TBC Hours Hours Hours Full temperature range 0.0 105.6 133.98 Watts Vout = nominal 50% load magnetic feedback 23.64 24.0 1.5 28.5 24.36 30 10 Vdc % of Vnom. Vdc % of Vnom. Vin = 16.8-137.5V. 98% of Vnom., after warmup Hiccup technique, autorecovery within 1% of Vout Output shorted to ground Current limiting, hiccup autorestart Vin = min. to max. Vout = nom. Iout = min. to max. 50-75-50% load step settling time to within 1% of Vout Peak deviation 5 Hz- 20 MHz BW At all outputs ESR 0.02 min., resistive load 0.0 6.5 4.4 7.75 5.5 9.5 Amps Amps 0.5 1 Amps 0.25 % of Vnom. 0.25 200 % of Vnom. Sec 250 150 mV mV pk-pk % of Vnom./C F Notes Unless otherwise noted, units are specified with 1F ceramic and 10F tantalum external output capacitors in parallel (low ESR). The external input capacitor is 33F, low ESR. 27 -10 Continuous 100 200 100 0.02 1200 Undervoltage shutdown is also available as a user-adjustable option. Back ripple current input filter is Cin=33F, Cbus=220F, Lbus=12H Remove overload for recovery Output may be shorted to ground with no damage. www.murata-ps.com/support MDC_UCR100.C02 Page 5 of 20 UCR100 Series 3U High Reliability DC-DC Converters FUNCTIONAL SPECIFICATIONS FOR ALL MODELS, CONTINUED FEATURES and OPTIONS Remote On/Off Control Unit is OFF Unit is ON Shutdown Current Remote Sense Conditions/Comments Negative logic Pin open or external voltage Minimum See Performance Data for temperature derating curves With derating Vin = Zero (no power) Measured at case center Absolute Operating Temperature Range Storage Temperature Thermal Protection/Shutdown Electromagnetic Interference (pending) Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 Relative humidity, non-condensing ABSOLUTE MAXIMUM RATINGS Input Voltage, Transient Input Reverse Polarity On/Off Control Storage Temperature Range 1 50 0.8 2 Vdc Vdc mA 10 % +10 % of Vout 1.0 25 Vdc A % of Iout mS Monotonic 0.8 20 10 4.38x0.81x6.52 111x20.3x165.5 18 510 21 595 Aluminum H15 Provided by case P87 pinout, per DIN41612 Operating Ambient Temperature Range Units -10 Weight: UCR100-240-T72 Case Material Rear Connector EMI/RFI Shielding ENVIRONMENTAL Maximum 2.5 -0.5 Open collector/drain Sense pins connected externally to respective Vout's Vout trim Pre-biased startup External voltage < Vset Isolated Vout "OK" Signal <optional> ("S" suffix) Vout ready (LO) Iok < 0.5 mA Vout fail (HI) External Vok < 15V. Current Share <optional> "S" or "SV" suffix External Cap Hold-up Time <"V" or "SV" suffix> See Hold-up Time note Input Undervoltage Lockout See Input Undervoltage Lockout note <"V" or "SV" suffix> MECHANICAL Outline Dimensions please refer to Mechanical Specifications Weight: UCR100-050-T72, UCR100-120-T72 Typical/Nominal Inches mm Ounces Grams Ounces Grams -40 71 C -40 -55 105 95 125 120 C C C 154 Vdc Vdc Vdc C 110 Measure within 19" rack To +85C/85% Operating or non-operating, 100 mS max. Notes 0 Yes Power on or off, referred to -Vin Vin = Zero (no power) Unless otherwise noted, units are specified with 1F ceramic and 10F tantalum external output capacitors in parallel (low ESR). The external input capacitor is 33F, low ESR. Undervoltage shutdown is also available as a user-adjustable option. -0.5 -55 50 125 Back ripple current input filter is Cin=33F, Cbus=220F, Lbus=12H Remove overload for recovery Output may be shorted to ground with no damage. www.murata-ps.com/support MDC_UCR100.C02 Page 6 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-050-T72-C Efficiency vs. Line Voltage and Load Current @ Ta = +25C Power Dissipation vs. Load Current @ Ta = +25C 90 30 85 25 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 75 Efficiency (%) Power Dissipation (Watts) 80 70 65 60 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 20 15 10 55 5 50 45 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0 20 1 2 3 4 5 6 7 8 Load Current (Amps) 9 10 11 12 13 14 15 16 17 18 19 20 Output Load Current (Amps) Output Voltage Vs. Input Line Voltage and Output Load Current 5.142 5.14 5.138 Output Voltage (Volts) 5.136 5.134 5.132 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 5.13 5.128 5.126 5.124 5.122 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Output Load Current (Amps) Maximum Power Temperature Derating at Sea Level 100 LFM (air flow from Rear Panel to Input Conn.) 110 110 105 105 100 100 95 95 Output Power (Watts) Output Power (Watts) Maximum Power Temperature Derating at Sea Level Natural Convection 90 85 Vin = 24 V Vin = 36 V Vin = 48 V Vin = 60 V Vin = 72 V to 137.5 V 80 75 70 90 85 75 70 65 65 60 60 55 30 35 40 45 50 55 60 65 Ambient Temperature (C) 70 75 80 85 Vin = 24 V Vin = 36 V Vin = 48 V Vin = 60 V Vin = 72 V to 137.5 V 80 55 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCR100.C02 Page 7 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-050-T72-C Start-up Delay (Vin=72V, Vout=nom, Iout=20A, Cload=8000uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. On/Off Enable Start-up (Vin=72V, Vout=nom, Iout=20A, Cload=8000uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. Step Load Transient Response (Vin=72V, Vout=nom, Cload= 10uF || 1uF, Iout=50-75-50% of full load (Iout=10A/Div), Ta=+25C) Output Ripple and Noise (Vin=72V, Iout=20A, Cload= 10uF || 1uF, Ta=+25C) www.murata-ps.com/support MDC_UCR100.C02 Page 8 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-120-T72-C Power Dissipation vs. Load Current @ Ta = +25C 30 94 92 90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 25 Power Dissipation (Watts) Efficiency (%) Efficiency vs. Line Voltage and Load Current @ Ta = +25C Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 20 15 10 5 0 1 2 3 4 5 6 7 8 9 1 10 2 3 4 5 6 7 8 9 10 Output Load Current (Amps) Load Current (Amps) Output Voltage Vs. Input Line Voltage and Output Load Current 11.99 11.988 11.986 Output Voltage (Volts) 11.984 11.982 11.98 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 11.978 11.976 11.974 11.972 11.97 1 2 3 4 5 6 7 8 9 10 Output Load Current (Amps) Maximum Power Temperature Derating at Sea Level 100 LFM (air flow from Rear Panel to Input Conn.) 125 125 120 120 115 115 110 110 Output Power (Watts) Output Power (Watts) Maximum Power Temperature Derating at Sea Level Natural Convection 105 Vin = 60 V Vin = 72 V Vin = 96 V Vin = 110 V 100 95 Vin = 24 V Vin = 36 V Vin = 48 V 90 85 105 100 95 85 80 75 75 30 35 40 45 50 55 60 65 Ambient Temperature (C) 70 75 80 85 Vin = 24 V Vin = 36 V Vin = 48 V 90 80 70 Vin = 60 V Vin = 72 V Vin = 96 V Vin = 110 V 70 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCR100.C02 Page 9 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-120-T72-C Start-up Delay (Vin=72V, Vout=nom, Iout=10A, Cload=4700uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. On/Off Enable Start-up (Vin=72V, Vout=nom, Iout=10A, Cload=3300uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. Step Load Transient Response (Vin=72V, Vout=nom, Cload= 10uF || 1uF, Iout=50-75-50% of full load (Iout=5A/Div), Ta=+25C) Output Ripple and Noise (Vin=72V, Iout=10A, Cload= 10uF || 1uF, Ta=+25C) www.murata-ps.com/support MDC_UCR100.C02 Page 10 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-240-T72-C Efficiency vs. Line Voltage and Load Current @ Ta = +25C Power Dissipation vs. Load Current @ Ta = +25C 95 35 91 30 Power Dissipation (Watts) 87 Efficiency (%) 83 79 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 75 71 67 63 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 25 20 15 10 5 59 0 55 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 5.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 80 85 Output Load Current (Amps) Load Current (Amps) Output Voltage Vs. Input Line Voltage and Output Load Current 24.04 24.035 24.03 Output Voltage (Volts) 24.025 24.02 Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 72V Vin = 96V Vin = 110V 24.015 24.01 24.005 24 23.995 23.99 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Output Load Current (Amps) 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 Maximum Power Temperature Derating at Sea Level 100 LFM (air flow from Rear Panel to Input Conn.) Vin = 48 V Vin = 60 V to 137.5 V Output Power (Watts) Output Power (Watts) Maximum Power Temperature Derating at Sea Level Natural Convection Vin = 24 V Vin = 36 V 30 35 40 45 50 55 60 65 Ambient Temperature (C) 70 75 80 85 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 Vin = 48 V Vin = 60 V to 137.5 V Vin = 24 V Vin = 36 V 30 35 40 45 50 55 60 65 70 75 Ambient Temperature (C) www.murata-ps.com/support MDC_UCR100.C02 Page 11 of 20 UCR100 Series 3U High Reliability DC-DC Converters PERFORMANCE DATA, UCR100-240-T72-C Start-up Delay (Vin=72V, Vout=nom, Iout=5.5A, Cload=1200uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. On/Off Enable Start-up (Vin=72V, Vout=nom, Iout=5.5A, Cload=1200uF, Ta=+25C) Trace1=Vin, Trace 2=Vout. Step Load Transient Response (Vin=72V, Vout=nom, Cload= 10uF || 1uF, Iout=50-75-50% of full load (Iout=2A/Div), Ta=+25C) Output Ripple and Noise (Vin=72V, Iout=5.5A, Cload= 10uF || 1uF, Ta=+25C) www.murata-ps.com/support MDC_UCR100.C02 Page 12 of 20 UCR100 Series 3U High Reliability DC-DC Converters MECHANICAL SPECIFICATIONS Dimensions are in mm (inches shown for ref. only). 127.0 (5.00) 19.5 (0.77) Third Angle Projection REAR FACE 104.0 (4.09) Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 1 M3x0.5 6mm DEEP (4 Places) Components are shown for reference only. 165.5 (6.52) 172.9 (6.81) REF 4 TE Module Slot (REF ONLY) TOP 20.3 15.2 10.2 5.1 (TE) 5.9 (0.23) 100.0 (3.94) MAIN FACE CL Slide CL Conn CL Slide 171.9 (6.77) 7.0 111.0 (4.37) ISOMETRIC 19.8 (0.78) 5.5 (0.22) 100.0 (3.94) 111.0 (4.37) FRONT PLATE BACK PLATE Figure 2. Case C90 TABLE 2. PIN ALLOCATION Pin Function 4 Output Voltage (positive) 6 Output Voltage (positive) 8 Output Voltage (negative) 10 Output Voltage (negative) 12 Remote Sense (positive)* 14 Remote Sense (negative)* 16 Output Voltage Trim 18 Current Share 20 Not Connected 22 + Vout OK / Hold-up 24 - Vout OK / UVLO 26 Protective Earth* 28 Remote On/Off** 30 Input Voltage (positive) 32 Input Voltage (negative) 30 Standard +Vout +Vout -Vout -Vout +Sense -Sense Trim NA*** NC NC NC PE On/Off +Vin -Vin Option "S" +Vout +Vout -Vout -Vout +Sense -Sense Trim Current Share NC +Vout OK -Vout OK PE On/Off +Vin -Vin Option "V" +Vout +Vout -Vout -Vout +Sense -Sense Trim NA*** NC H-UP UVLO PE On/Off +Vin -Vin Option "SV" +Vout +Vout -Vout -Vout +Sense -Sense Trim Current Share NC H-UP UVLO PE On/Off +Vin -Vin 32 26 28 22 24 18 20 14 16 10 12 6 8 4 Figure 3. Rear connector detail When using units with the load share option in stand-alone operation with the remote sense feature, the load share pin must be connected to -Vout. This does not apply if the remote sense lines are connected directly at the connector. * Leading pin (connect first, break last) ** Connect to -Vin if not used *** Pin is disconnected internally Pinout P87 www.murata-ps.com/support MDC_UCR100.C02 Page 13 of 20 UCR100 Series 3U High Reliability DC-DC Converters SHIPPING TRAYS AND BOXES (3 TRAYS PER CARTON, 6 UNITS PER CARTON) PAD, 1/2" THK (1) FOAM TRAYS (3) CORRUGATED BOX SHIPPING TRAY DIMENSIONS (2 UNITS PER TRAY) 9.92 (252.0) 4x R 0.50 (12.7) A 1.25 (31.8) 4x 0.25 (6.4) 4x 45 AD H ON ESIV IN E N SID O E O T PE F C RM AV ITT ITY ED AD H ON ESIV IN E N SID O E O T PE F C RM AV ITT ITY ED 0.787 (20.0) 9.92 (252.0) 6.85 (174.0) 1.54 (39.0) A 0.46 (11.6) 4.38 (111.3) 2.19 (55.6) 2.19 (55.6) 4.38 (111.3) SECTION A-A SCALE 1 : 1 0.46 (11.6) MATERIAL: DOW 220 ANTISTAT ETHAFOAM (DENSITY: 34-35 Kg/m3) www.murata-ps.com/support MDC_UCR100.C02 Page 14 of 20 UCR100 Series 3U High Reliability DC-DC Converters Electromagnetic Compatibility (EMC) Immunity: A transorb diode together with a symmetrical input filter form an effective protection against high input transient voltages, which typically occur in most installations, but especially in battery-driven mobile applications. The UCR-Series are tested to the following specifications: Phenomenon Supply related surge Standard RIA 12 EN 50155 Electrostatic discharge (to case) Electromagnetic field Coupling mode B +i/- i D Direct transients Indirect coupled transients Level RIA 12 EN 50155: 1995 -i/c, +i/-i G H L -o/c, +o/-o, -o/-i contact discharge IEC/EN 61000-4-2 4 IEC/EN 61000-4-3 x ENV 50204 4 Electrical fast transients/burst IEC/EN 61000-4-4 4 Surges IEC/EN 61000-4-5 Conducted disturbances IEC/EN 61000-4-6 Value applied 1.5 x Vbatt 1.4 x Vbatt Waveform 0.1/1/0.1 s 1800 Vp 5/50 s 8400 Vp 0.05/0.1 s 1800 Vp 5/50 s 8400 Vp 0.05/0.1 s Source impedance 0.2 1 Test procedure In operation Perf. crit. 1 positive surge yes A 5 pos. and 5 neg. impulses yes A 5 100 1/50 ns 330 10 positive and 10 negative discharges yes B 8000 Vp air discharge 15000 Vp antenna 20 V/m AM 80% 1 kHz n.a. 80 - 1000 MHz yes A antenna 30 V/m 50% duty cycle, 200 Hz repetition frequency n.a. 900 5 MHz yes A capacitive, o/c 2000 Vp bursts of 5/50 ns 5 kHz over 15 ms; burst period: 300 ms 50 60 s positive 60 s negative transients per coupling mode yes B 2 5 pos. and 5 neg. surges per coupling mode yes B 150 0.15 - 80 MHz yes A direct, +i/c, -i/c,+i/-i 4000 Vp i/c 2000 Vp 3 2 +i/-i 1000 Vp 3 i, o, signal wires 10 VAC (140 dBV) 12 1.2/50 s AM 80% 1 kHz i = input, o = output, c = case. A = Normal operation, no deviation from specs, B = Temporary deviation from specs possible. Measured with an external input capacitor specified in table 4 of the standard. Corresponds to EN 50155:2001, waveform A, and EN 50121-3-2:2000, table 7.2. Corresponds to EN 50155:2001, waveform B. Corresponds to EN 50121-3-2:2000, table 9.2. Corresponds to EN 50121-3-2:2000, table 9.1. Corresponds to EN 50121-3-2:2000, table 7.1. Corresponds to EN 50121-3-2:2000, table 7.4. Fulfills also EN 50121-5:2000, table 1.2, where ENV 50204 is referenced. www.murata-ps.com/support MDC_UCR100.C02 Page 15 of 20 UCR100 Series 3U High Reliability DC-DC Converters Immunity to Environmental Conditions Test method Standard Test Conditions 40 2 C 93 +2/-3 % 56 days Status Converter not operating Cab Damp heat steady state IEC/EN 60068-2-78 MIL-STD-810D section 507.2 Temperature: Relative humidity: Duration: Kb Salt mist, cyclic (sodium chloride NaCl solution) IEC/EN 60068-2-52 Concentration: Storage: Number of cycles 5% (30C) for 2 hours 40C, 93% rel. humidity for 22 hours 3 (= 3 days) Converter not operating Eb Bump (half-sinusoidal) IEC/EN 60068-2-29 MIL-STD-810D section 516.3 Acceleration amplitude: Bump duration: Number of bumps: 25 gn = 245 m/s2 11 ms 6000 (1000 in each direction) Converter operating Acceleration amplitude: Fc Vibration (sinusoidal) IEC/EN 60068-2-6 MIL-STD-810D section 514.3 Frequency (1 Oct/min): Test duration: 0.35 mm (10 - 60 Hz) 5 gn = 49 m/s2 (60 - 2000 Hz) 10 - 2000 Hz 7.5 hours (2.5 hours in each axis) Converter operating Ea Shock (half-sinusoidal) IEC/EN 60068-2-27 MIL-STD-810D section 516.3 Acceleration amplitude: Bump duration: Number of bumps: 50 gn = 490 m/s2 11 ms 18 (3 in each direction) Converter operating -- Shock EN 50155 / EN 61373 sect. 10, class A and B body mounted Acceleration amplitude: Bump duration: Number of bumps: 5.1 gn 30 ms 18 (3 in each direction) Converter operating Fda Random vibration wide band Reproducibility high IEC/EN 60068-2-35 DIN 40046 part 23 Acceleration spectral density: Frequency band: Acceleration magnitude: Test duration: 0.05 gn2/Hz 20 - 500 Hz 4.9 gn rms 3 hours (1 hour in each axis) Converter operating -- Simulated long life testing at increased random vibration levels EN 50155 / EN 61373 sect. 9, cat 1, class B, body mounted Acceleration spectral density: Frequency band: Acceleration magnitude: Test duration: 0.02 gn2/Hz 5 - 150 Hz 0.8 gn rms 15 hours (5 hours in each axis) Converter operating Body mounted = chassis of a railway coach Technical Notes Start-Up Threshold and Undervoltage Shutdown Under normal start-up conditions, the UCR Series will not begin to regulate properly until the ramping input voltage exceeds the Start-Up Threshold. Once operating, devices will turn off when the applied voltage drops below the Undervoltage Shutdown point. Devices will remain off as long as the undervoltage condition continues. Units will automatically re-start when the applied voltage is brought back above the Start-Up Threshold. The hysteresis built into this function avoids an indeterminate on/off condition at a single input voltage. See Performance/Functional Specifications table for actual limits. Start-Up Time The VIN to VOUT Start-Up Time is the interval between the point at which a ramping input voltage crosses the Start-Up Threshold voltage and the point at which the fully loaded output voltage enters and remains within its specified 1% 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 to the converter. The On/Off to VOUT start-up time assumes that the converter is turned off via the Remote On/Off Control with the nominal input voltage already applied. On/Off Control The primary-side, Remote On/Off Control function is off when On/Off is high/ open and on when On/Off is pulled low or grounded. See Figure 4. 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. Current Limiting When power demands from the output falls within the current limit inception range for the rated output current, 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 a somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point where the full-power output voltage falls below the specified tolerance. If the load current being drawn from the converter is significant enough, the unit will go into a short circuit condition. See "Short Circuit Condition." www.murata-ps.com/support MDC_UCR100.C02 Page 16 of 20 UCR100 Series 3U High Reliability DC-DC Converters 30 +Vin +Vcc 28 ON/OFF CONTROL REF 32 -Vin COMMON Figure 4. Driving the Remote On/Off Control Pin Short Circuit Condition When a converter is in current limit mode the output voltages 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 voltages to begin ramping to their appropriate values. 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 UCR is capable of enduring an indefinite short circuit output condition. Thermal Shutdown UCR converters are equipped with thermal-shutdown circuitry. If the internal temperature of the DC-DC converter rises above the designed operating temperature (See Performance Specifications), 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. 30 +Vin +Vout +Vout +SENSE 28 ON/OFF TRIM 32 -Vin -Vout -Vout 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 a sustained, non-current-limited, input-voltage polarity reversal exists. For MPS UCR Series DC-DC Converters, fast-blow fuses are recommended with values no greater than twice the maximum input current. Fuse Specifications Model Fuse Type Reference and rating UCR100-050-T72-C Fast-blow 15A 250V UCR100-120-T72-C Fast-blow 18A 250V UCR100-240-T72-C Fast-blow 20A 250V Trimming Output Voltage UCR converters have a trim capability that enables users to adjust the output voltage from -10% to +10% of Vnominal. Adjustments to the output voltage can be accomplished with a single fixed resistor as shown in Figures 5 and 6. A single fixed resistor can increase or decrease the output voltage depending on its connection. Resistors should be located close to the converter and have TCR's less than 100ppm/C to minimize sensitivity to changes in temperature. If the trim function is not used, leave the trim pin open. Trim adjustments greater than the specified -10% to +10% can have an adverse affect on the converter's performance and are not recommended. Excessive voltage differences between VOUT and Sense, in conjunction with trim adjustment of the output voltage, can cause the overvoltage protection circuitry to activate (see Functional Specifications for overvoltage limits). 4 6 12 16 LOAD RTRIM UP -SENSE Output Overvoltage Protection The output voltage is monitored for an overvoltage condition via magnetic coupling to the primary side. If the output voltage rises to a fault condition, which could be damaging to the load circuitry (see Functional Specifications), 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 voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. 14 Use only one trim up or trim down resistor. Do not connect both resistors simultaneously. When trimming, do not exceed maximum output power. 8 30 10 +Vin +Vout +Vout +SENSE 4 6 12 Figure 5. Trim Connections to Increase Output Voltage Using Fixed Resistors 28 ON/OFF TRIM 16 LOAD RTRIM DOWN 4 x (Vout - 2.5V) RTRIM Up (k) = ___________________ 2.5V x (Vout / Vnom - 1) -SENSE 32 -Vin -Vout -Vout 14 8 10 Figure 6. Trim Connections to Decrease Output Voltage Using Fixed Resistors 4 x Vout RTRIM Down (k) = __________ Vnom - Vout www.murata-ps.com/support MDC_UCR100.C02 Page 17 of 20 UCR100 Series 3U High Reliability DC-DC Converters Remote Sense UCR 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. In cables and discrete wiring applications, twisted pair or other techniques should be implemented. UCR series converters will compensate for drops between the output voltage at the DC-DC converter output pins and the voltage at the DC-DC sense input pins provided that: Conformal Coating The UCR modules have conformal coating to protect them against moisture, dust, and chemical and temperature extremes during all types of applications. They provide environmental and mechanical protection to extend the life of the components and circuitry significantly. Conformal coating on the UCR modules is applied by dipping. Conformal coating protects the UCR modules from moisture and contaminants, preventing short circuits and corrosion of conductors and solder joints. In addition, the use of conformal coating protects circuits and components from abrasion and solvents. Stress relief is also provided, as well as protection of the insulation resistance of the module. The conformal coating is particularly useful for protecting circuitry in severe service environments, while maintaining a low stress environment for components and connections. Features and Options [VOUT(+) - VOUT(-)] - [Sense(+) - Sense (-)] 10% VOUT Output overvoltage 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 overvoltage protection circuitry to activate (see Performance Specifications for overvoltage 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 conveter's specified rating, or cause output voltages to climb into the output overvoltage region. Therefore, the designer must ensure: (VOUT at pins) (IOUT) rated output power 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 must connect the +Sense to +VOUT and -Sense to -VOUT at the DC-DC converter pins. Contact and PCB resistance losses due to IR drops +Vout +Vout -Vin Hold-Up Time The hold-up time function provided by the UCR100 is designed to work with an external hold-up capacitor that is charged from circuitry internal to the converter. Hold-up time is defined as the duration of time that the DC-DC converter output will remain active following a loss of input power. When the hold-up function is activated, the UCR100 uses the hold-up capacitor energy to support operation. This provides a charge that maintains the DC-DC converter in operation for 10ms of hold-up time. The capacitors in the application are recommended below. The values in the table are standard capacitor values that will provide a hold-up time of better than 10ms. Vin 24V 36V 48V 72V 96V 110V Standard 1900f 1000f 860f 680f 510f 1200f Working Voltage 75VDC 100VDC 100VDC 150VDC 150VDC 150VDC Figure 8 shows the relationship between the input voltage and the fall of the output voltage. Converter Input Source Voltage IOUT +SENSE Vout nom Sense Current ON/OFF TRIM LOAD Sense Return -SENSE IOUT Return +Vin -Vout -Vout Vout min Converter Output Voltage Contact and PCB resistance losses due to IR drops Figure 7. Remote Sense Circuit Configuration Hold-Up Time Figure 8. Hold-up Time to DC-DC Converter www.murata-ps.com/support MDC_UCR100.C02 Page 18 of 20 UCR100 Series 3U High Reliability DC-DC Converters Figure 9 shows the connection of the external output capacitor for the UCR100 model. +Vin + +Vout H-UP UCR100 -Vout -Vin Undervoltage Lockout URC series converters with the -V or -SV suffix have an undervoltage lockout feature that will shut down the controller if the input voltage falls below an adjustable threshold. The undervoltage threshold is determined by the value of a resistor placed between the UVLO and -Vin. Figure 10 shows a typical configuration. +Vout UVLO UCR100 K When using units with the load share option in stand-alone operation with the remote sense feature, the load share pin must be connected to -Vout. This connection is not needed if the remote sense lines are connected directly at the connector. Using series connections (see figure 11) Figure 11 illustrates a typical configuration for two URC converters connected in series. The Current Share inputs should be left floating or tied to -Vout. When connected in series the maximum load regulation remains constant as a percentage of the series output voltage. The total percentage of regulation does not change over the series string however the regulation amounts (in millivolts) accumulate in each converter. When trimming UCRs in a series-connected chain, be sure to avoid exceeding the voltage trim limits for each individual converter. Specifically, try to make the trim adjustments approximately equal on all series-connected converters. -Vout -Vin UCR converters may be connected in series to achieve a higher output voltage. URC converters with the optional current share feature (-S and -SV models) may also be connected in parallel to support higher output current, to improve redundancy or to spread the thermal load in high power, high temperature environments. Please refer to the typical circuits below. For all modes, use short connections with sufficient wire gauge and adequate grounding. Trim circuits are not shown in the following diagrams however they are the same as the Output Adjustment section. A desirable feature of using multiple converters is that, since all units are isolated, they can use a common input power supply. Or you may use separate inputs for redundancy. Figure 9. Connection of External Hold-up Capacitor +Vin Using Multiple Converters UCR #1 Figure 10. Undervoltage Lockout Configuration The converter will remain off as long as the input voltage remains below the UVLO threshold. Devices will automatically restart when the applied voltage rises above the UVLO threshold. The hysteresis built into this function prevents an indeterminate on/off condition at a single input voltage. The table below shows common UVLO values for various nominal input voltages and the required resistor value for each. Vin Nominal (V) 24 36 48 72 96 110 UVLO (V) 14.4 (1V) 21.6 (1V) 28.8 (1V) 43.2 (1V) 57.6 (1V) 66 (1V) UVLO External Trim Resistor (K) 50 11.5 6.1 2.7 1.5 1.1 +Vout +Vout +SENSE +Vin Current Share Floating or -Vout -Vin -Vout -Vout -SENSE COMMON Vin SUPPLY RLOAD UCR #2 +Vin +Vout +Vout +SENSE Current Share Floating or -Vout -Vin -Vout -Vout -SENSE Figure 11. Series Connections Using parallel connections - Load Sharing (see figure 12) The +Sense must be left open when current sharing is required. Be sure to differentiate between wiring for redundancy or wiring for load sharing which is greater than one converter's output current rating. Redundant connections www.murata-ps.com/support MDC_UCR100.C02 Page 19 of 20 UCR100 Series 3U High Reliability DC-DC Converters drops may be suitable in the loop whereas 0.7 Volt silicon power diodes may not be advisable. The Sense inputs are being asked to compensate for both the diode drop and the wiring losses. Placing the diodes "in the loop" provides better system regulation at the risk of exceeding power levels (see figure 14). UCR #1 +Vin +Vout +Vout +SENSE Floating Current Share UCR #1 RLOAD -Vin -Vout -Vout -SENSE Vin SUPPLY +Vin +Vout +Vout +SENSE "OR'ing" diode Floating UCR #2 Current Share +Vin +Vout +Vout +SENSE -Vin Current Share -Vin -Vout -Vout -SENSE Floating Vin SUPPLY -Vout -Vout -SENSE RLOAD UCR #2 +Vin Figure 12. Load-Sharing Parallel Connections -Vin -Vout -Vout -SENSE expect one or the remaining converters to absorb the whole load if one converter fails. Therefore the entire load cannot exceed the rating of one converter. Figure 13. Redundant Parallel Connections Load sharing requires all parallel converters to be operational since failure of one converter forces all others to go into overcurrent shutdown. For two or more parallel load sharing converters, connect all Current Share pins together. The load-share parallel current circuit requires interconnection of the Current Share pins between each converter to insure that the current load is approximately balanced between all converters. The diodes should be identical part numbers to enhance balance between the two converters. The default factory nominal voltage should be sufficiently matched between converters however you may wish to add optional external trim circuits to make the load approximately equal. Adjust the converters for equal output voltage before connecting in parallel. The OR'ing diode system is the responsibility of the user. Be aware of the power levels applied to the diodes and possible heat sink requirements. Be very careful placing the diodes "in the loop" when when using Sense inputs. This might cause the output terminals to exceed their +10% trim range or maximum power outputs. Schottky power diodes with approximately 0.3 Volt Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED Floating Current Share Additional UCRs Using parallel connections - Redundancy The redundancy connections in figures 13 and 14 requires external usersupplied "OR'ing" diodes to share the load. The diodes prevent one converter with slightly higher voltage forcing current into the lower-current converter. The diodes also protect the application against catastrophic "crow-barring" failure (shorted output) by one of the converters. +Vout +Vout +SENSE UCR #1 +Vin +Vout +Vout +SENSE RLOAD Current Share -Vin -Vout -Vout -SENSE COMMON Vin SUPPLY UCR #2 +Vin +Vout +Vout +SENSE Current Share -Vin -Vout -Vout -SENSE Figure 14. Optional Redundant Parallel Sense Wiring 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) 2013 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_UCR100.C02 Page 20 of 20