UWQ-12/20-T48 Series www.murata-ps.com Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PRODUCT OVERVIEW Typical unit FEATURES Fixed DC outputs, 12V @ 20A Industry standard quarter brick 2.3” x 1.45” x 0.46” open frame package Wide range 18 to 60 Vdc input voltages with 2250 Volt Basic isolation Remote ON/Off enable control DOSA-compatible pinouts and form factor High efficiency synchronous rectifier topology The UWQ series offers high output current (up to 20 Amps) in an industry standard “quarter brick” package requiring no heat sink for most applications. The UWQ series delivers fixed DC output voltages up to 240 Watts (12V @ 20A) for printed circuit board mounting. Wide range inputs of 18 to 60 Volts DC (48 Volts nominal) are ideal for datacom and telecom systems. The UWQ-12/20-T48xS offers a load sharing option for paralleling up to three modules in the most demanding, power hungry applications. The UWQ-12/20-T48xT is trimmable from 10.8Vout to 13.2Vout and includes Sense pins to compensate for voltage drops at the load. Advanced automated surface mount assembly and planar magnetics deliver galvanic isolation rated at 2250 Vdc for basic insulation. To power digital systems, the outputs offer fast settling to current steps and tolerance of higher capacitive loads. Excellent ripple and noise specifications assure compatibility to CPUs, ASICs, programmable logic and FPGAs. No minimum load is required. For systems needing controlled startup/shutdown, an external remote On/Off control may use either positive or negative logic. A wealth of self-protection features include input undervoltage lockout and overtemperature shutdown using an on-board temperature sensor; overcurrent protection using the “hiccup” autorestart technique, provides indefinite short-circuit protection, along with output OVP. The synchronous rectifier topology offers high efficiency for minimal heat generation and “no heat sink” operation. The UWQ series is certified to safety standards UL/ IEC/CSA 60950-1, 2nd edition. It meets class B EMI conducted emission compliance to EN55022, CISPR22 with an external filter. Multiple-unit parallel operation for increased current Stable no-load operation Monotonic startup into pre-bias output condition Certified to UL/60950-1, CSA-C22.2 No. 609501, 2nd edition safety approvals Extensive self-protection, OVP, input undervoltage, current limiting and thermal shutdown Trimmable output from 10.8V to 13.2V APPLICATIONS Embedded systems, datacom and telecom installations, wireless base stations Disk farms, data centers and cellular repeater sites Remote sensor systems, dedicated controllers Instrumentation systems, R&D platforms, automated test fixtures Data concentrators, voice forwarding and speech processing systems +Vin (1) F1 +Vout (8) Barrier External DC Power Source On/Off Control (2) Controller and Power Reference and Error Amplifier Trim (6) -Vin (3) -Vout (4) Figure 1. Connection Diagram Typical topology is shown. Murata Power Solutions recommends an external fuse. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 1 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀ Output Root Model ➀ Input Iout Iin full R/N (mV pk-pk) Regulation (Max.) ➁ Vout (Amps, Power Vin Nom. Range Iin no load (Volts) max.) (Watts) Typ. Max. Line Load (Volts) (Volts) load (mA) (Amps) Efficiency Min. Typ. Dimensions (open frame) (inches) (mm) UWQ-12/20-T48 12 20 240 100 120 ±1.0 ±1.5 48 18-60 90 5.43 90% 92% 2.30x1.45x0.46 max. 58.4x36.8x11.7 UWQ-12/20-T48xS 12 20 240 100 120 ±1.25 ±2.5 48 18-60 90 5.43 90% 92% 2.30x1.45x0.46 max. 58.4x36.8x11.7 UWQ-12/20-T48xT 12 20 240 100 120 ±0.25 ±0.3 48 18-60 80 5.43 90% 92% 2.30x1.45x0.46 max. 58.4x36.8x11.7 ➀ Please refer to the part number structure for additional ordering information and options. ➁ All specifications are typical at nominal line voltage and full load, +25°C unless otherwise noted. See detailed specifications. Output capacitors are 1 μF || 10 μF with a 22μF input capacitor. These caps are necessary for our test equipment and may not be needed for your application. PART NUMBER STRUCTURE UWQ - 12 / 20 - T48 N T B S Lx - C RoHS Hazardous Materials compliance C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder), standard Family Series: Wide Input Quarter Brick Pin length option Blank = Standard pin length 0.180 in. (4.6 mm) L1 = 0.110 in. (2.79 mm) ➀ L2 = 0.145 in. (3.68 mm) ➀ Nominal Output Voltage Maximum Rated Output: Current in Amps Load Share Option Blank = No share S = Load share Input Voltage Range: T48 = 18-60 Volts (48V nominal) On/Off Control Logic N = Negative logic P = Positive logic Baseplate (optional) Blank = No baseplate, standard B = Baseplate installed, optional Trim & Sense Option Blank = No trim and sense T = Trim and sense ➀ Special quantity order is required; samples available with standard pin length only. ➁ Some model number combinations may not be available. See website or contact your local Murata sales representative. UWQ-12/20-T48NBL1-C Complete Model Number Example: Negative On/Off logic, baseplate installed, 0.110˝ pin length, RoHS-6 compliance www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 2 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, UWQ-12/20-T48 Conditions ➀ ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Full power operation Operating or non-operating, 100 mS max. duration Input to output Power on or off, referred to -Vin Input Voltage, Transient Isolation Voltage On/Off Remote Control Output Power Minimum 18 Typical/Nominal 48 0 0 Maximum Units 70 Vdc 75 Vdc 2250 13.5 247.2 Vdc Vdc W 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. Output Current Conditions ➀ ➂ INPUT Operating voltage range Recommended External Fuse Start-up threshold Undervoltage shutdown Internal Filter Type Input current Full Load Conditions Low Line Inrush Transient Output in Short Circuit No Load input current (T48xT models) No Load input current (all other models) Shut down mode input current Reflected (back) ripple current ➁ Pre-biased startup 18 Fast blow Rising input voltage Falling input voltage 16 14.75 Vin = nominal Vin = minimum Vin = 48V. 48 20 16.75 15.5 L-C 5.43 14.65 0.05 50 80 90 5 15 Monotonic Iout = minimum, unit = ON Iout = minimum, unit = ON Measured at input with specified filter External output voltage < Vset 60 17.5 16.75 Vdc A Vdc Vdc 5.72 15.34 0.1 100 150 150 8 25 A A A2-Sec. mA mA mA mA mA, RMS GENERAL and SAFETY Efficiency Isolation Isolation Voltage, input to output Isolation Voltage, input to baseplate Isolation Voltage, output to baseplate Insulation Safety Rating Isolation Resistance Isolation Capacitance Safety (certified to the following requirements) Calculated MTBF Vin=48V, full load Vin=min 90 89.5 With or without baseplate With baseplate With baseplate 2250 1500 1500 92 91 % % Vdc Vdc Vdc basic 100 1500 UL-60950-1, CSA-C22.2 No.60950-1, IEC/60950-1, 2nd edition Per Telcordia SR-332, issue 1, class 3, ground fixed, Tambient = +25°C MΩ pF Yes Hours x 103 TBD DYNAMIC CHARACTERISTICS (T48xT models) Fixed Switching Frequency Startup Time Startup Time Dynamic Load Response Dynamic Load Peak Deviation 250 275 60 60 220 ±500 300 65 65 275 ±700 KHz mS mS μSec mV 180 200 10 10 200 ±1100 220 20 20 250 ±1300 KHz mS mS μSec mV 1 1 13.5 2 Vdc Vdc mA 13.5 1 2 V V mA Power On, to Vout regulation band Remote ON to Vout Regulated 50-75-50% load step to 3% error band same as above DYNAMIC CHARACTERISTICS (all other models) Fixed Switching Frequency Startup Time Startup Time Dynamic Load Response Dynamic Load Peak Deviation Power On, to Vout regulation band Remote ON to Vout Regulated 50-75-50% load step to 3% error band same as above FEATURES and OPTIONS Remote On/Off Control ➃ “N” suffix: Negative Logic, ON state Negative Logic, OFF state Control Current “P” suffix: Positive Logic, ON state Positive Logic, OFF state Control Current Base Plate ON = pin grounded or external voltage OFF = pin open or external voltage open collector/drain 0 3.5 ON = pin open or external voltage OFF = ground pin or external voltage open collector/drain "B" suffix 3.5 0 1 optional www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 3 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, UWQ-12/20-T48, (CONT.) Conditions ➀ OUTPUT Total Output Power Voltage Setting Accuracy, fixed output Output Voltage Range (T48xT models) Overvoltage Protection Current Output Current Range Minimum Load Current Limit Inception Short Circuit Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation (standard 12/20-T48) ➄ Line Regulation Load Regulation Regulation (T48xS models) ➄ Line Regulation Load Regulation Regulation (T48xT models) ➄ Line Regulation Load Regulation Ripple and Noise ➅ Temperature Coefficient Maximum Capacitive Loading Current Share Accuracy (2 units in parallel) (T48xS models) Remote Sense Compliance (T48xT models) Minimum Typical/Nominal Maximum Units 0.0 240 247.2 W 11.64 -10 12 12.36 +10 15 Vdc % of Vnom. Vdc 0 20 No minimum load 25.5 20 A 27.5 A 1 2 A Vin=min. to max., Vout=nom., full load Iout=min. to max., Vin=nom. ±1 ±1.5 % of Vout % of Vout Vin=min. to max., Vout=nom., full load Iout=min. to max., Vin=nom. ±1.25 ±2.5 % of Vout % of Vout Vin=min. to max., Vout=nom., full load Iout=min. to max., Vin=nom. 5 Hz- 20 MHz BW, Cout=1μF MLCC paralleled with 10μF tantalum At all outputs Low ESR ±0.25 ±0.3 % of Vout % of Vout 120 mV pk-pk At 50% load, not user adjustable User-adjustable Via magnetic feedback 96% of Vnom., cold condition 23.5 Hiccup technique, autorecovery within 1.25% of Vout Output shorted to ground, no damage Continuous Hiccup current limiting Non-latching 100 0.02 5000 % of Vout./°C μF Percent deviation from ideal sharing (50%) ±10 % Sense connected at load 10 % of Vout MECHANICAL (Through Hole Models) Outline Dimensions (no baseplate) (Please refer to outline drawing) Outline Dimensions (with baseplate) Weight 2.3x1.45x0.46 max. 58.4x36.8x11.68 2.3x1.45x0.5 58.4x36.8x12.7 1.6 45 2.24 63.5 0.04 & 0.06 1.016 & 1.52 Copper alloy 50 5 Aluminum LxWxH No baseplate No baseplate With baseplate With baseplate Through Hole Pin Diameter Through Hole Pin Material TH Pin Plating Metal and Thickness Nickel subplate Gold overplate Baseplate Material Inches mm Inches mm Ounces Grams Ounces Grams Inches mm μ-inches μ-inches ENVIRONMENTAL Operating Ambient Temperature Range Operating Case Temperature Storage Temperature Thermal Protection/Shutdown Electromagnetic Interference Conducted, EN55022/CISPR22 RoHS rating See derating curves With baseplate, no derating Vin = Zero (no power) Measured at hotspot External filter is required -40 -40 -55 135 140 B RoHS-6 85 110 125 150 °C °C °C °C Class Notes ➀ Unless otherwise noted, all specifications apply at Vin = nominal, nominal output voltage and full output load. General conditions are near sea level altitude, no base plate installed and natural convection airflow unless otherwise specified. All models are tested and specified with external parallel 1 μF and 10 μF multi-layer ceramic output capacitors and a 22μF external input capacitor (see Technical Notes). All capacitors are low-ESR types wired close to the converter. These capacitors are necessary for our test equipment and may not be needed in the user’s application. ➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is Cin = 33 μF/100V, Cbus = 220μF/100V and Lbus = 12 μH. ➂ All models are stable and regulate to specification under no load. ➃ The Remote On/Off Control is referred to -Vin. ➄ Regulation specifications describe the output voltage changes as the line voltage or load current is varied from its nominal or midpoint value to either extreme. The load step is ±25% of full load current. ➅ Output Ripple and Noise is measured with Cout = 1 μF || 10 μF, 20 MHz oscilloscope bandwidth and full resistive load. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 4 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48-C Efficiency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Load Current @ +25°C 25 94 92 90 Efficiency (%) Power Dissipation (Watts) 20 88 VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 86 84 82 80 78 76 15 VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 10 5 74 72 70 0 2 4 6 8 10 12 Load Current (Amps) 14 16 18 20 2 4 6 8 10 12 14 16 18 20 Output Load Curre nt (Amps) Thermal image with hot spot at 10.8A with 25°C ambient temperature. Natural convection is used with no forced airflow. Identifiable and recommended maximum value to be verified in application. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 5 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48-C Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 21 18 18 15 15 12 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 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) 9 6 9 6 3 0 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) 12 3 30 35 40 45 50 55 60 65 70 75 80 0 85 30 35 40 45 50 Ambient Temperature (°C) 21 21 18 18 15 15 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) 9 6 65 70 75 80 85 80 85 12 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) 9 6 3 0 60 Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 12 55 Ambient Temperature (°C) 3 30 35 40 45 50 55 60 65 70 75 80 0 85 30 35 40 45 50 Ambient Temperature (°C) 55 60 65 70 75 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 Output Current (Amps) 18 15 12 9 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) 6 3 0 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 6 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48-C Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 19 19 17 17 15 15 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 13 11 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) 9 7 13 11 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) 9 7 5 5 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 Ambient Temperature (°C) 19 19 17 17 15 15 13 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) 9 60 65 70 75 80 85 80 85 Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 11 55 Ambient Temperature (°C) 13 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) 11 9 7 7 5 5 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 Ambient Temperature (°C) 55 60 65 70 75 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 19 Output Current (Amps) 17 15 13 11 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) 9 7 5 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 7 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48-C Start-up Delay (Vin = 48V, Iout = 0A, Cload = 0, Ta = +25°C) Ch1 = Vin, Ch2 = Vout Start-up Delay (Vin = 48V, Iout = 20A, Cload = 5000μF, Ta = +25°C) Ch1 = Vin, Ch2 = Vout On/Off Enable Delay (Vin = 48V, Vout = nom, Iout = 20A, Cload = 5000μF, Ta = +25°C) Ch1 = Enable, Ch2 = Vout. Stepload Transient Response (Vin = 48V, Iout = 50-75-50% of Imax, Cload = 1μF || 10μF, Io = 10A/div, Ta = +25°C) Ch2 = Vout, Ch4 = Iout Output ripple and Noise (Vin = 48V, Iout = 0A, Cload = 1μF || 10μF, Ta = +25°C, BW = 20Mhz) Output ripple and Noise (Vin = 48V, Iout = 20A, Cload = 1μF || 10μF, Ta = +25°C, BW = 20Mhz) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 8 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xS Efficiency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Load Current @ +25°C 25 94 92 90 20 Efficiency (%) 86 84 82 Power Dissipation (Watts) VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 88 80 78 76 15 VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 10 5 74 72 0 70 2 4 6 8 10 12 14 16 18 2 20 4 6 8 10 12 14 Output Load Curre nt (Amps) 16 18 20 Load Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 21 18 18 15 15 12 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 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) 9 6 3 12 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) 9 6 3 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 Ambient Temperature (°C) 21 18 18 15 15 Output Current (Amps) Output Current (Amps) 60 65 70 75 80 85 80 85 Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 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) 9 55 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 12 50 6 3 12 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) 9 6 3 0 0 30 35 40 45 50 55 60 65 Ambient Temperature (°C) 70 75 80 85 30 35 40 45 50 55 60 65 70 75 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 9 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xS Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, without baseplate) 21 15 Output Current (Amps) Output Current (Amps) 18 12 9 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) 6 3 0 30 35 40 45 50 55 60 65 70 75 80 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 85 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) 30 35 40 45 Ambient Temperature (°C) 18 17 15 Output Current (Amps) Output Current (Amps) 16 14 13 12 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) 9 8 7 6 30 35 40 45 50 55 60 65 70 75 80 85 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 30 40 45 Output Current (Amps) Output Current (Amps) 50 55 60 65 Ambient Temperature (°C) 75 80 85 35 40 45 50 55 60 65 70 75 80 85 80 85 Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, without baseplate) 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) 35 70 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, without baseplate) 30 65 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) Ambient Temperature (°C) 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 60 Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, without baseplate) 19 10 55 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, without baseplate) 11 50 70 75 80 85 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 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) 30 35 40 45 50 55 60 65 70 75 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 10 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xS Start-up Delay (Vin=48V, Iout=0A, Cload=5000μF, Ta=+25°C) Ch1= Vin, Ch2= Vout Start-up Delay (Vin=48V, Iout=20A, Cload=5000μF, Ta=+25°C) Ch1= Vin, Ch2= Vout Start-up Parallel Operation (Vin=48V, Iout=full load, Cload=10000μF, Ta=+25°C) Ch1= Vin, Ch2, Ch3= Vout Enable Start-up Delay (Vin=48V, Iout=20A, Cload=5000μF, Ta=+25°C) Ch1= Enable, Ch2= Vout Output Ripple and Noise (Vin=48V, Iout=0A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz) Output Ripple and Noise (Vin=48V, Iout=20A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 11 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xS Stepload Transient Response (Vin=48V, Iout=50-75-50% of Imax, Cload=1μF || 10μF, Io=10A/div, Ta=+25°C) Ch2=Vout, Ch4=Iout Thermal image with hot spot at 10.8A with 25°C ambient temperature. Natural convection is used with no forced airflow. Identifiable and recommended maximum value to be verified in application. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 12 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xT Efficiency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Load Current @ +25°C 30 94 92 25 Efficiency (%) 88 Power Dissipation (Watts) 90 VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 86 84 82 80 78 76 20 15 VIN = 18V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 10 5 74 72 0 2 70 2 4 6 8 10 12 14 16 18 20 4 6 8 10 12 14 Output Load Curre nt (Amps) 16 18 20 Load Current (Amps) Thermal image with hot spot at 8.9A with 25°C ambient temperature. Natural convection is used with no forced airflow. Identifiable and recommended maximum value to be verified in application www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 13 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xT 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 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) 30 35 40 45 50 55 60 65 70 75 80 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 85 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) 30 35 40 45 50 Ambient Temperature (°C) 60 65 70 75 80 85 80 85 Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 18 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 55 Ambient Temperature (°C) 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 12 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) 9 6 3 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 Ambient Temperature (°C) 55 60 65 70 75 Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate) 21 Output Current (Amps) 18 15 12 9 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) 6 3 0 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 14 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters PERFORMANCE DATA, UWQ-12/20-T48xT Maximum Current Temperature Derating at sea level (Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) Maximum Current Temperature Derating at sea level (Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 18 17 16 Output Current (Amps) Output Current (Amps) 15 14 13 12 11 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) 10 9 8 7 6 30 35 40 45 50 55 60 65 70 75 80 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 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) 30 85 35 40 45 50 60 65 70 75 80 85 80 85 Maximum Current Temperature Derating at sea level (Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 20 18 16 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 55 Ambient Temperature (°C) Ambient Temperature (°C) 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) 14 12 10 8 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) 6 4 2 0 30 35 40 45 50 55 60 65 70 75 80 30 85 35 40 45 50 55 60 65 70 75 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating at sea level (Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, no baseplate) 18 16 Output Current (Amps) 14 12 10 8 6 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) 4 2 0 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 15 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters TYPICAL PERFORMANCE DATA, UWQ-12/20-T48xT Start-up Delay (Vin=48V, Iout=0A, Cload=5000μF, Ta=+25°C) Ch1= Vin, Ch2= Vout Start-up Delay (Vin=48V, Iout=20A, Cload=5000μF, Ta=+25°C) Ch1= Vin, Ch2= Vout On/Off Enable Delay (Vin=48V, Vout=nom, Iout=20A, Cload=5000μF, Ta=+25°C) Ch1= Enable, Ch2= Vout. Stepload Transient Response (Vin=48V, Iout=50-75-50% of Imax, Cload=1μF || 10μF, Io=10A/div, Ta=+25°C) Ch2=Vout, Ch4=Iout Output ripple and Noise (Vin=48V, Iout=0A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz) Output ripple and Noise (Vin=48V, Iout=20A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz) www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 16 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters MECHANICAL SPECIFICATIONS (OPEN FRAME)—STANDARD AND T48xS MODELS TOP VIEW END VIEW END VIEW 58.4 2.30 4.78 0.188* [11.68] 0.46 36.8 1.45 1° MAX (ALL PINS) 0.26 0.010 MIN BOTTOM CLEARANCE Mtg Plane SIDE VIEW *Alternate pin lengths available (Contact Murata Power Solutions for information). Pin location dimensions apply at circuit board level. .062 SHOULDER (AT 40 MIL PINS) MATERIAL: .040 PINS: COPPER ALLOY .060 PINS: COPPER ALLOY .083 SHOULDER (AT 60 MIL PINS) 1.02±0.05 0.040±.002 @ PINS 1-3 FINISH: (ALL PINS) GOLD (5μ"MIN) OVER NICKEL (50μ" MIN) 1.52±0.05 0.060±.002 @ PINS 4 & 8 50.80 2.000 REF 50.80 2.000 3.8 0.15 7.61 0.300 3 CL 4 15.24 0.600 2 1 8 BOTTOM VIEW Dimensions are in inches (mm) shown for ref. only. Third Angle Projection I/O Connections (pin side view) Pin 1 2 3 Function +Vin Remote On/Off Control -Vin Pin 4 Function -Vout 8 +Vout Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 17 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters MECHANICAL SPECIFICATIONS (BASEPLATE)—STANDARD AND T48xS MODELS 4x M3x0.5 THREADED HOLE (.10 MAX SCREW PENETRATION) TOP VIEW 58.4 2.30 END VIEW END VIEW 12.7 0.50 47.24 1.860 4.78 0.188* 36.8 1.45 1° MAX (ALL PINS) 26.16 1.030 0.26 0.010 MIN BOTTOM CLEARANCE Mtg Plane SIDE VIEW OPTIONAL BASEPLATE 'B' OPTION *Alternate pin lengths available (Contact Murata Power Solutions for information). Pin location dimensions apply at circuit board level. .062 SHOULDER (AT 40 MIL PINS) MATERIAL: .040 PINS: COPPER ALLOY .060 PINS: COPPER ALLOY .083 SHOULDER (AT 60 MIL PINS) 1.02±0.05 0.040±.002 @ PINS 1-3 FINISH: (ALL PINS) GOLD (5μ"MIN) OVER NICKEL (50μ" MIN) 1.52±0.05 .060±.002 @ PINS 4 & 8 50.80 2.000 REF 3.8 0.15 50.80 2.000 7.61 0.300 3 CL 4 15.24 0.600 2 1 8 BOTTOM VIEW Dimensions are in inches (mm) shown for ref. only. Third Angle Projection I/O Connections (pin side view) Pin 1 2 3 Function +Vin Remote On/Off Control -Vin Pin 4 Function -Vout 8 +Vout Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 18 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters RECOMMENDED FOOTPRINT—STANDARD AND T48xS MODELS Recommended Footprint (view through converter) REF: DOSA Standard Specification for Quarter-Brick DC/DC Converters FINISHED HOLE SIZES @ PINS 1-3 TOP VIEW (PER IPC-D-275, LEVEL C) 0.048-0.062 CL (PRI) (SEC) 1 37.3 1.47 CL 8 7.62 0.300 2 7.62 0.300 4 3 CL FINISHED HOLE SIZES @ PINS 4 & 8 0.100 MIN @ 1-4, 8 FOR PIN SHOULDERS (PER IPC-D-275, LEVEL C) 25.4 1.00 0.070-0.084 50.80 2.000 58.9 2.32 It is recommended that no parts be placed beneath converter (hatched area). Dimensions are in inches (mm) shown for ref. only. Third Angle Projection I/O Connections (pin side view) Pin 1 2 3 Function +Vin Remote On/Off Control -Vin Pin 4 Function -Vout 8 +Vout Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 19 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters MECHANICAL SPECIFICATIONS (OPEN FRAME)—T48xT MODELS TOP VIEW 4.78 .188 (NOTE 1) END VIEW 58.4 2.30 END VIEW 11.7 .46 36.8 1.45 1° MAX (ALL PINS) 0.25 .010 MIN BOTTOM CLEARANCE Mtg Plane SIDE VIEW .062 SHOULDER (AT 40 MIL PINS) MATERIAL: .040 PINS: COPPER ALLOY .062 PINS: COPPER ALLOY 1.57±0.05 .062±.002 @PINS 4 & 8 1.02±0.05 .040±.002 @PINS 1-3 FINISH: (ALL PINS) GOLD (5μ"MIN) OVER NICKEL (50μ" MIN) 2.000 REF 50.80 2.000 3.8 .15 7.62 .300 1. ALTERNATE PIN LENGTHS AVAILABLE (SEE PART NUMBER STRUCTURE) 2. COMPONENTS SHOWN ARE FOR REF ONLY 3. DIMENSIONS ARE IN INCHES [mm] 4. PIN LOCATION DIMENSIONS APPLY AT CIRCUIT BOARD LEVEL 5. THESE CONVERTERS MEET THE MECHANICAL SPECIFICATIONS OF A QUARTER BRICK DC-DC CONVERTER 3 4 5 6 2 7 1 8 BOTTOM VIEW (PIN SIDE) 7.62 .300 CL 3.81 .150 3.81 .150 INPUT/OUTPUT CONNECTIONS Pin Function 1 +Vin 2 Remote On/Off * 3 -Vin 4 -Vout 5 -Sense 6 Trim 7 +Sense 8 +Vout *The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) logic. 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 ± 2˚ Components are shown for reference only and may vary between units. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 20 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters MECHANICAL SPECIFICATIONS (BASEPLATE)—T48xT MODELS TOP VIEW END VIEW 12.2 0.48 47.24 1.860 4.78 0.188 36.8 1.45 1° MAX (ALL PINS) END VIEW 58.4 2.30 26.16 1.030 M3x0.5 x 0.10 MAX PENETRATION (x4) 0.25 0.010 MIN BOTTOM CLEARANCE Mtg Plane SIDE VIEW 0.062 SHOULDER (AT 40 MIL PINS) MATERIAL: 0.040 PINS: COPPER ALLOY 0.062 PINS: COPPER ALLOY 1.57±0.05 0.062±0.002 @PINS 4 & 8 1.02±0.05 0.040±0.002 @PINS 1-3 FINISH: (ALL PINS) GOLD (5μ"MIN) OVER NICKEL (50μ" MIN) 2.000 REF 50.80 2.000 3.8 0.15 3.81 0.150 7.62 0.300 1. ALTERNATE PIN LENGTHS AVAILABLE (SEE PART NUMBER STRUCTURE) 2. COMPONENTS SHOWN ARE FOR REF ONLY 3. DIMENSIONS ARE IN INCHES [mm] 4. PIN LOCATION DIMENSIONS APPLY AT CIRCUIT BOARD LEVEL 5. THESE CONVERTERS MEET THE MECHANICAL SPECIFICATIONS OF A QUARTER BRICK DC-DC CONVERTER 3 4 5 6 2 7 8 1 BOTTOM VIEW (PIN SIDE) 7.62 0.300 CL 3.81 0.150 3.81 0.150 INPUT/OUTPUT CONNECTIONS Pin Function 1 +Vin 2 Remote On/Off * 3 -Vin 4 -Vout 5 -Sense 6 Trim 7 +Sense 8 +Vout *The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) logic. 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 ± 2˚ Components are shown for reference only and may vary between units. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 21 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters RECOMMENDED FOOTPRINT—T48xT MODELS RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER) REF: DOSA STANDARD SPECIFICATION FOR QUARTER BRICK DC/DC CONVERTERS FINISHED HOLE SIZES @ 1-3, 5-7 TOP VIEW (PER IPC-D-275, LEVEL C) 0.048-0.062 CL (PRI) (SEC) 1 2 CL 37.3 1.47 8 7 3.81 0.150 6 5 4 3 0.100 MIN @ 1-3, 5-7 FOR PIN SHOULDERS 3.81 0.150 7.62 0.300 CL 7.62 0.300 FINISHED HOLE SIZES @ PINS 4 & 8 25.4 1.00 (PER IPC-D-275, LEVEL C) 50.80 2.000 0.070-0.084 58.9 2.32 IT IS RECOMMENDED THAT NO PARTS BE PLACED BENEATH CONVERTER (HATCHED AREA) 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 ± 2˚ Components are shown for reference only and may vary between units. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 22 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters STANDARD PACKAGING 9.92 (251.97) REF 9.92 (251.97) REF Each static dissipative polyethylene foam tray accommodates 15 converters in a 3 x 5 array. 0.88 (22.35) REF 2.75 (69.85) ±.25 closed height 11.00 (279.4) ±.25 10.50 (266.7) ±.25 Carton accommodates two (2) trays yielding 30 converters per carton 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 ± 2˚ www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 23 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. For greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. The installer must observe all relevant safety standards and regulations. For safety agency approvals, install the converter in compliance with the end-user safety standard. Parallel Load Sharing (S Option, Load Sharing) Two or more converters may be connected in parallel at both the input and output terminals to support higher output current (total power, see figure 2) or to improve reliability due to the reduced stress that results when the modules are operating below their rated limits. For applications requiring current share, follow the guidelines below. The output voltage will decrease when the load current is increased. Our goal is to have each converter contribute nearly identical current into the output load under all input, environmental and load conditions. F1 +Vin +Vout Vin CH1 On/Off CH2 Vout CH3 CH1 = Vin CH2 = On/Off CH3 = Vout Figure 3. Typical Turn On for Positive Logic Modules CAUTION: This converter is not internally fused. To avoid danger to persons or equipment and to retain safety certification, the user must connect an external fast-blow input fuse as listed in the specifications. Be sure that the PC board pad area and etch size are adequate to provide enough current so that the fuse will blow with an overload. On/Off –Vin –Vout + F2 + Input Source – + Input Filter – +Vin +Vout On/Off –Vin LOAD –Vout – On/Off Signal F3 +Vin +Vout Using Parallel Connections – Redundancy (N+1) The redundancy connections in figure 4 requires external user supplied “OR”ing diodes or “OR”ing MOSFETs for reliability purposes. The diodes allow for an uninterruptable power system operation in case of a catastrophic failure (shorted output) by one of the converters. The diodes should be identical part numbers to enhance balance between the converters. The default factory nominal voltage should be sufficiently matched between converters. 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. On/Off –Vin –Vout Figure 2. Load Sharing Block Diagram F1 Using Parallel Connections – Load Sharing (Power Boost) All converters must be powered up and powered down simultaneously. Use a common input power source. It is required to use a common Remote On/Off logic control signal to turn on modules (see figure 2). When Vin has reached steady state, apply control signal to the all modules. Figure 3 illustrates the turn on process for positive logic modules. First power up the parallel system (all converters) with a load not exceeding the rated load of each converter and allow converters to settle (typically 20-100mS) before applying full load. As a practical matter, if the loads are downstream PoL converters, power these up shortly after the converter has reached steady state output. Also be aware of the delay caused by charging up external bypass capacitors. It is critical that the PCB layout incorporates identical connections from each module to the load; use the same trace rating and airflow/thermal environments. If you add input filter components, use identical components and layout. When converters are connected in parallel, allow for a safety factor of at least 10%. Up to 90% of max output current can be used from each module. +Vin +Vout On/Off –Vin –Vout + F2 + Input Source – + Input Filter – +Vin +Vout On/Off –Vin LOAD –Vout – On/Off Signal F3 +Vin +Vout On/Off –Vin –Vout Figure 4. Redundant Parallel Connections www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 24 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters Schottky power diodes with approximately 0.3V drops or “OR”ing MOSFETs may be suitable in the loop whereas 0.7 V silicon power diodes may not be advisable. In the event of an internal device fault or failure of the mains power modules on the primary side, the other devices automatically take over the entire supply of the loads. In the basic N+1 power system, the “N” equals the number of modules required to fully power the system and “+1” equals one back-up module that will take over for a failed module. If the system consists of two power modules, each providing 50% of the total load power under normal operation and one module fails, another one delivers full power to the load. This means you can use smaller and less expensive power converters as the redundant elements, while achieving the goal of increased availability. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the rising input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Delay Assuming that the output current is set at the rated maximum, the Vin to Vout StartUp Delay (see Specifications) is the time interval between the point when the rising input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified regulation band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit to moderate the duty cycle of the PWM controller at power up, thereby limiting the input inrush current. The On/Off Remote Control interval from inception to VOUT regulated assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified regulation band. The specification assumes that the output is fully loaded at maximum rated current. Input Source Impedance These converters will operate to specifications without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance, performance is improved by adding external filter components. Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors must accept high speed switching currents. inductance. Excessive input inductance may inhibit operation. The DC input regulation specifies that the input voltage, once operating, must never degrade below the Shut-Down Threshold under all load conditions. Be sure to use adequate trace sizes and mount components close to the converter. I/O Filtering, Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (CIN in the figure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient IR drops in the input conductors. Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the figure below, the CBUS and LBUS components simulate a typical DC voltage bus. Your specific system configuration may require additional considerations. Please note that the values of CIN, LBUS and CBUS may vary according to the specific converter model. TO OSCILLOSCOPE CURRENT PROBE +VIN VIN LBUS + – + – CBUS CIN −VIN CIN = 33μF, ESR < 200mΩ @ 100kHz CBUS = 220μF, 100V LBUS = 12μH Figure 5. Measuring Input Ripple Current In critical applications, output ripple and noise (also referred to as periodic and random deviations or PARD) may be reduced by adding filter elements such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR. +VOUT C1 C2 SCOPE RLOAD −VOUT C1 = 1μF C2 = 10μF LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 6. Measuring Output Ripple and Noise (PARD) Because of the switching nature of DC-DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate DC input regulation. Performance will degrade with increasing input www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 25 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters Floating Outputs Since these are isolated DC-DC converters, their outputs are “floating” with respect to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW between input and output. Real-world converters however do exhibit tiny leakage currents between input and output (see Specifications). These leakages consist of both an AC stray capacitance coupling component and a DC leakage resistance. When using the isolation feature, do not allow the isolation voltage to exceed specifications. Otherwise the converter may be damaged. Designers will normally use the negative output (-Output) as the ground return of the load circuit. You can however use the positive output (+Output) as the ground return to effectively reverse the output polarity. Minimum Output Loading Requirements These converters employ a synchronous rectifier design topology. All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. Thermal Shutdown To protect against thermal over-stress, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC-DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in this data sheet illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in temperature and/or current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that “natural convection” is defined as very low flow rates which are not using fan-forced airflow. Depending on the application, “natural convection” is usually about 30-65 LFM but is not equal to still air (0 LFM). Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. As a practical matter, it is quite difficult to insert an anemometer to precisely measure airflow in most applications. Sometimes it is possible to estimate the effective airflow if you thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. CAUTION: If you exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected near Sea Level altitude. Be sure to reduce the derating for higher altitude. Output Overvoltage Protection (OVP) This converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. The signal is optically coupled to the primary side PWM controller. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power down and reset the converter for this automatic OVP-recovery restart. If the fault condition persists and the output voltage climbs to excessive levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to as “hiccup” mode. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However, your application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate external protection. Current Limiting (Power limit with current mode control) As power demand increases on the output and enters the specified “limit inception range” (current in voltage mode and power in current mode) limiting circuitry activates in the DC-DC converter to limit/restrict the maximum current or total power available. In voltage mode, current limit can have a “constant or foldback” characteristic. In current mode, once the current reaches a certain range the output voltage will start to decrease while the output current continues to increase, thereby maintaining constant power, until a maximum peak current is reached and the converter enters a “hiccup” (on off cycling) mode of operation until the load is reduced below the threshold level, whereupon it will return to a normal mode of operation. Current limit inception is defined as the point where the output voltage has decreased by a pre-specified percentage (usually a 2% decrease from nominal). Short Circuit Condition (Current mode control) The short circuit condition is an extension of the “Current Limiting” condition. When the monitored peak current signal reaches a certain range, the PWM controller’s outputs are shut off thereby turning the converter “off.” This is followed by an extended time out period. This period can vary depending on other conditions such as the input voltage level. Following this time out period, the PWM controller will attempt to re-start the converter by initiating a “normal start cycle” which includes softstart. If the “fault condition” persists, another “hiccup” cycle is initiated. This “cycle” can and will continue indefinitely until such time as the “fault condition” is removed, at which time the converter will resume “normal operation.” Operating in the “hiccup” mode during a fault condition is advantageous in that average input and output power levels are held low preventing excessive internal increases in temperature. Remote On/Off Control On the input side, a remote On/Off Control can be specified with either positive or negative logic as follows: Positive: Models equipped with positive logic are enabled when the On/Off pin is left open or is pulled high to +13.5VDC with respect to –VIN. An internal bias current causes the open pin to rise to +VIN. Positive-logic devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –VIN. Negative: Models with negative logic are on (enabled) when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –VIN. The device is off (disabled) when the On/Off is left open or is pulled high to +13.5VDC Max. with respect to –VIN. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 26 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters Dynamic control of the On/Off function should be able to sink the specified signal current when brought low and withstand specified voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. There are two CAUTIONs for the On/Off Control: CAUTION: While it is possible to control the On/Off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor or a relay (which can thereupon be controlled by logic). The On/Off prefers to be set at approx. +13.5V (open pin) for the ON state, assuming positive logic. CAUTION: Do not apply voltages to the On/Off pin when there is no input power voltage. Otherwise the converter may be permanently damaged. [1] Conducted Emissions Parts List Reference Part Number Description L1 L3 C8 PE-62913 500uH,10A, MPS C7 VZ Series C16, C17 1mH, 6A 500uH,10A 2.2μFd Qty 2 - Electrolytic Capacitor 22μFd, 100V .22μFd Vendor Pulse Murata Murata Panasonic Unknown [2] Conducted Emissions Test Equipment Used Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC Rohde & Schwarz Software ESPC-1 Ver. 2.20 HP11947A Transient Limiter (Agilent) OHMITE 25W – Resistor combinations DC Source Programmable DC Power Supply Model 62012P-100-50 [3] Layout Recommendations Most applications can use the filtering which is already installed inside the converter or with the addition of the recommended external capacitors. For greater emissions suppression, consider additional filter components and/or shielding. Emissions performance will depend on the user’s PC board layout, the chassis shielding environment and choice of external components. Please refer to Application Note GEAN02 for further discussion. +VCC ON/OFF CONTROL -VIN Since many factors affect both the amplitude and spectra of emissions, we recommend using an engineer who is experienced at emissions suppression. Emissions Performance Murata Power Solutions measures its products for radio frequency emissions against the EN 55022 and CISPR 22 standards. Passive resistance loads are employed and the output is set to the maximum voltage. If you set up your own emissions testing, make sure the output load is rated at continuous power while doing the tests. Trimming Output Voltage UWQ converters have a trim capability (pin 6) that enables users to adjust the output voltage from +10% to –10% (refer to the trim equations in the table below). Adjustments to the output voltage can be accomplished with a single fixed resistor as shown in Figures 9 and 10. 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. The recommended external input and output capacitors (if required) are included. Please refer to the fundamental switching frequency. All of this information is listed in the Product Specifications. An external discrete filter is installed and the circuit diagram is shown below. Standard UWQs have a “positive trim” where a single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage. A resistor connected from the Trim Pin (pin 6) to the –Sense (pin 5) will decrease the output voltage. Figure 7. Driving the On/Off Control Pin (suggested circuit) UWQ EMI 200W Test Card 48Vdc in, 12Vout, 17Amps Resistive Load UUT V+ Black C16 C8 C8 C17 C8 C8 L3 C8 C8 C7 Vin + Vout + L1 V- Vin - Vout - Resistive Load inside a metal container Trim adjustments greater than the specified +10%/–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 Performance Specifications for overvoltage limits). Temperature/power derating is based on maximum output current and voltage at the converter’s output pins. Use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the UWQ’s specified rating, or cause output voltages to climb into the output overvoltage region. Therefore: (VOUT at pins) x (IOUT) rated output power Figure 8. Conducted Emissions Test Circuit www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 27 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. Trim Up* RT UP (kΩ) = Trim Down* 49.6(VO – 1.226) –10.2 VO – 12 RT DOWN (kΩ) = 60.45 Contact and PCB resistance losses due to IR drops +VIN +VOUT I OUT –10.2 +SENSE 12 – VO Sense Current ON/OFF CONTROL *Vo = Desirable output voltage in Volts TRIM LOAD Sense Return +VIN −SENSE +VOUT I OUT Return +SENSE ON/OFF CONTROL –VIN TRIM LOAD RTRIM UP –SENSE –VIN Contact and PCB resistance losses due to IR drops Figure 11. Remote Sense Circuit Configuration –VOUT Figure 9. Trim Connections To Increase Output Voltages Using Fixed Resistors +VIN -VOUT +VOUT Any long, distributed wiring and/or significant inductance introduced into the Sense control loop can adversely affect overall system stability. If in doubt, test your applications by observing the converter’s output transient response during step loads. There should not be any appreciable ringing or oscillation. You may also adjust the output trim slightly to compensate for voltage loss in any external filter elements. Do not exceed maximum power ratings. +SENSE ON/OFF CONTROL TRIM LOAD RTRIM DOWN –SENSE –VIN –VOUT Figure 10. Trim Connections To Decrease Output Voltages Using Fixed Resistors Remote Sense Input Use the Sense inputs with caution. Sense is normally connected at the load. Sense inputs compensate for output voltage inaccuracy delivered at the load. This is done by correcting IR voltage drops along the output wiring and the current carrying capacity of PC board etch. This output drop (the difference between Sense and Vout when measured at the converter) should not exceed 0.5V. Consider using heavier wire if this drop is excessive. Sense inputs also improve the stability of the converter and load system by optimizing the control loop phase margin. Note: The Sense input and power Vout lines are internally connected through low value resistors to their respective polarities so that the converter can operate without external connection to the Sense. Nevertheless, if the Sense function is not used for remote regulation, the user should connect +Sense to +Vout and –Sense to –Vout at the converter pins. The remote Sense lines carry very little current. They are also capacitively coupled to the output lines and therefore are in the feedback control loop to regulate and stabilize the output. As such, they are not low impedance inputs and must be treated with care in PC board layouts. Sense lines on the PCB should run adjacent to DC signals, preferably Ground. In cables and discrete wiring, use twisted pair, shielded tubing or similar techniques. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 28 of 29 UWQ-12/20-T48 Series Wide Input, Isolated DOSA Quarter Brick DC-DC Converters Vertical Wind Tunnel IR Transparent optical window Variable speed fan Unit under test (UUT) 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. 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 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. Ambient temperature sensor Airflow collimator 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 12. Vertical Wind Tunnel Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds Murata Power Solutions, Inc. 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. © 2016 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_UWQ-12/20-T48 Series.A02 Page 29 of 29