Single Output UCQ Models www.murata-ps.com Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters Typical units FEATURES PRODUCT OVERVIEW Standard quarter-brick package/pinout Low cost; Low profile, 0.4" (10.2mm) For applications requiring improved electrical and thermal performance at reduced cost, consider DATEL's new UCQ series "quarter brick" DC/DC power converters. These compact units measure just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm) and fit the industry-standard footprint. Available outputs range between 1.2V @ 30 Amps to 15V @ 6.7 Amps and accept a wide input range. The UCQ's interleaved, synchronous-rectifier topology offers high efficiency (up to 93%), tight line and load regulation, low noise and fast step response. A single-board optimized open-frame design contributes to impressive thermal operation. UCQ's will operate up to +70C and 100 LFM airflow with no derating. 24V or 48V nominal input Outputs: 1.2V to 15V Interleaved synchronous-rectifier topology * Ultra high efficiency * No output reverse conduction Outstanding thermal performance On/off control, trim & sense functions Fully isolated, 2250Vdc (BASIC) Output overvoltage protection Fully I/O protected; Thermal shutdown Designed to meet UL/EN/IEC60950-1 safety approvals The UCQ's feature full isolation to 2250Vdc meeting BASIC insulation requirements of UL/EN/IEC 60950-1. Input filters reduce propagated switching noise back to input sources. Also included is a remote On/Off switch control (with positive or negative polarity), output trim adjustable over nominal and output sense functions to reduce power lead losses. Extensive protection items avoid damage from out of limit voltages, currents and temperatures. Protection faults automatically recover using the hiccup technique. Besides safety testing to 60950-1, certifications for the UCQ include application for EMC compliance (to EN55022/ CISPR22 with filter), qualification testing. +SENSE (7) +VOUT (8) +VIN (3) SWITCH CONTROL -VOUT (4) -VIN (1) -SENSE (5) PWM CONTROLLER INPUT UNDERVOLTAGE, INPUT OVERVOLTAGE, AND OUTPUT OVERVOLTAGE COMPARATORS REMOTE ON/OFF CONTROL* (2) For full details go to www.murata-ps.com/rohs OPTO ISOLATION REFERENCE & ERROR AMP VOUT TRIM (6) * Can be ordered with positive (standard) or negative (optional) polarity. Figure 1. Simplified Schematic Typical topology may vary between units. www.murata-ps.com/support MDC_UCQ Models.B20 Page 1 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output R/N (mVp-p) VOUT IOUT Power (Volts) (Amps) (Watts) Root Models UCQ-1.2/40-D24P-C UCQ-1.2/30-D48N-C UCQ-1.5/25-D48N-C UCQ-1.5/40-D48N-C UCQ-1.8/30-D48N-C UCQ-1.8/40-D48N-C UCQ-2.5/40-D24P-C UCQ-2.5/30-D48N-C UCQ-3.3/35-D24P-C UCQ-3.3/20-D48N-C UCQ-3.3/30-D48N-C UCQ-3.3/40-D48N-C UCQ-5/20-D24P-C UCQ-5/20-D48N-C UCQ-5/25-D48N-C UCQ-12/8.3-D48N-C UCQ-15/6.7-D48N-C 1.2 1.2 1.5 1.5 1.8 1.8 2.5 2.5 3.3 3.3 3.3 3.3 5 5 5 12 15 40 30 25 40 30 40 40 30 35 20 30 40 20 20 25 8.3 6.7 48 36 37.5 60 54 72 100 75 115.5 66 99 132 100 100 125 99.6 100.5 Typ. 50 50 50 80 50 80 50 80 50 50 60 50 35 50 100 100 Max. 100 80 100 100 100 120 100 120 80 80 100 60 55 100 150 150 Input Regulation (Max.) Line VIN Nom. (Volts) Load Range (Volts) IIN no load (mA) IIN full load (Amps) Please contact Murata Power Solutions for further information. 0.125% 0.25% 48 36-75 30 0.90 0.125% 0.25% 48 36-75 50 0.94 0.125% 0.25% 48 36-75 50 1.45 0.125% 0.25% 48 36-75 45 1.31 0.1% 0.2% 48 36-75 30 1.70 0.125% 0.25% 24 18-36 120 4.96 0.125% 0.25% 48 36-75 50 1.80 0.25% 0.25% 24 18-36 130 5.41 0.125% 0.25% 48 36-75 50 1.53 0.125% 0.25% 48 36-75 50 2.3 0.1% 0.2% 48 36-75 30 3.06 0.125% 0.25% 24 18-36 160 4.55 0.125% 0.25% 48 36-75 80 2.26 0.125% 0.25% 48 36-75 30 2.89 0.125% 0.25% 48 36-75 80 2.28 0.125% 0.25% 48 36-75 100 2.28 Efficiency Min. Typ. 81% 81% 85% 83% 86% 82% 85% 87% 88.5% 89.5% 89% 88% 89% 88% 90% 90% 83% 83% 86% 86% 88% 84% 87% 89% 90% 91% 90% 91.5% 92% 90% 91% 92% Please refer to the part number structure for additional ordering part numbers and options. All specifications are at nominal line voltage and full load, +25 deg.C unless otherwise noted. See detailed specifications. Output capacitors are 1 F ceramic || 10 F electrolytic. I/O caps are necessary for our test equipment and may not be needed for your application. Outline dimensions: 2.3 x 1.45 x 0.40 inches 58.4 x 36.8 x 10.2 mm Pinout: P32 (all models) PART NUMBER STRUCTURE Output Configuration: Unipolar, single output U CQ - 3.3 / 30 - D48 N B Quarter-Brick Package Nominal Output Voltage Maximum Rated Output : Current in Amps Input Voltage Range: D24 = 18-36 Volts (24V nominal) D48 = 36-75 Volts (48V nominal) H Lx - C RoHS Hazardous Materials compliance C = RoHS-6, standard (does not claim EU RoHS exemption 7B-lead in solder) Y = RoHS-5 (with lead), optional, special order Pin length option Blank = standard pin length 0.180 in. (4.6 mm) L1 = 0.110 in. (2.79 mm)* L2 = 0.145 in. (3.68 mm)* Conformal coating (optional) Blank = no coating, standard H = coating added, optional special order *Special quantity order is required; no sample quantities available. Note: Some model number combinations may not be available. Please contact Murata Power Solutions. Baseplate (optional) Blank = No baseplate, standard B = Baseplate installed, optional special order On/Off Control Polarity P = Positive polarity (standard for D24, optional for D48) N = Negative polarity (standard for D48, optional for D24) www.murata-ps.com/support MDC_UCQ Models.B20 Page 2 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48 Input Input voltage range See ordering guide. Start-up threshold, Volts 34 34 34 34 34 Undervoltage shutdown, V 33 32 32.5 32.5 32 1.74 2.30 Pi-type Pi-type Overvoltage shutdown none Reflected (back) ripple current, mA pk-pk 10-30, model dependent Input Current Full load conditions See ordering guide. 2 Inrush transient, A sec 0.05 Output short circuit, mA 50-200, model dependent Low line (VIN = min.), Amps 1.23 1.26 1.96 Standby mode, mA (Off, UV, OT shutdown) Internal input filter type 1-10, model dependent Pi-type L-C Pi-type Reverse polarity protection None, install external fuse. Remote On/Off Control Positive logic (P model suffix) OFF = Ground pin to +0.8V ON = Open or +3.5 to +13.5V max Negative logic (N model suffix) OFF = Open or +3.5 to +13.5V ON = Ground pin to +0.8V max Current, mA 1 Output Voltage output range See ordering guide. Voltage output accuracy Adjustment range, % of VNOM. 1% of VNOM., (50% load) 10% -20 + 10 Temperature coefficient 10% No minimum loading. Remote sense compensation +10% Ripple/noise (20 MHz bandwidth) See ordering guide. Line/Load regulation See ordering guide. Efficiency See ordering guide. 10% 4,700 10,000 0.02% of VOUT range per C Minimum loading Maximum capacitive loading, F low ESR <0.02 max., resistive load 10% 1,000 10,000 10,000 Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 3 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48 Input Input voltage range Start-up threshold, Volts Undervoltage shutdown, V See ordering guide. 16.8 34 17 35 35 15 32 15 34 34 2.04 3.02 Pi Pi Overvoltage shutdown none Reflected (back) ripple current, mA pk-pk 10-30, model dependent Input Current Full load conditions See ordering guide. 2 Inrush transient, A sec 0.05 Output short circuit, mA 50-200, model dependent Low line (VIN = min.), Amps 6.69 2.39 7.21 Standby mode, mA (Off, UV, OT shutdown) Internal input filter type 1-10, model dependent Pi L-C L-C Reverse polarity protection None, install external fuse. Remote On/Off Control Positive logic (P model suffix) OFF = Ground pin to +0.8V ON = Open or +3.5 to +13.5V max Negative logic (N model suffix) OFF = Open or +3.5 to +13.5V ON = Ground pin to +0.8V max Current, mA 1 Output Voltage output range See ordering guide. Voltage output accuracy Adjustment range, % of VNOM. 1% of VNOM., (50% load) -20 + 10 -20 + 10 Temperature coefficient 10% 0.02% of VOUT range per C Minimum loading No minimum loading. Remote sense compensation +10% Ripple/noise (20 MHz bandwidth) See ordering guide. Line/Load regulation See ordering guide. Efficiency See ordering guide. Maximum capacitive loading, F low ESR <0.02 max., resistive load -10 to + 10% 10,000 10,000 10,000 10,000 10,000 Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 4 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-3.3/40-D48 UCQ-5/20-D24 UCQ-5/20-D48 33 17 35 31.5 16 34 UCQ-5/25-D48 UCQ-12/8.3-D48 UCQ-15/6.7-D48N-C 35 35 34 34 34 31.5 Input Input voltage range Start-up threshold, Volts Undervoltage shutdown, V See ordering guide Overvoltage shutdown none Reflected (back) ripple current, mA pk-pk 10-30, model dependent. 60 max. Input Current Full load conditions 2 See ordering guide. Inrush transient, A sec 0.1 0.05 0.03 Output short circuit, mA 1200 50-200, model dependent 120 Low line (VIN = min.), Amps 4.12 6.04 3.02 3.82 Standby mode, mA (Off, UV, OT shutdown) Internal input filter type 3.04 3.03 L-C Pi 1-10, model dependent Pi L-C L-C Reverse polarity protection L-C None, install external fuse. Remote On/Off Control Positive logic (P model suffix) OFF = Ground pin to +0.8V ON = Open or +3.5 to +13.5V max OFF = Ground pin or to +1V. ON = Open or +2.5 to +13.5V Negative logic (N model suffix) OFF = Open or +3.5 to +13.5V ON = Ground pin to +0.8V max OFF = Open or +2.5 to +13.5V ON = Ground pin or to +1V. Current, mA 1 Output Voltage output range See ordering guide. Voltage output accuracy 1% of VNOM., (50% load) Adjustment range, % of VNOM. -10 to + 10% 0.02% of VOUT range per C. Temperature coefficient Minimum loading No minimum loading. Remote sense compensation +10% Ripple/noise (20 MHz bandwidth) See ordering guide. Line/Load regulation See ordering guide. Efficiency See ordering guide. Maximum capacitive loading, F low ESR <0.02 max., resistive load 10,000 10,000 10,000 10,000 1,000 1000 Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 5 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48 Isolation Voltage Input to Output, Volts min. 2250 Input to baseplate, Volts min. 1500 Baseplate to output, Volts min. 1500 Isolation resistance, M 10-100, model dependent Isolation capacitance, pF 1000 Isolation safety rating Basic insulation Miscellaneous Current limit inception (98% of VOUT, after warmup), Amps 35 Short circuit protection method 35 49 35 49 Current limiting, hiccup autorestart. Remove overload for recovery. Short circuit current, Amps 5 Short circuit duration Continuous, output shorted to ground. No damage. Overvoltage protection, Volts (via magnetic feedback) 1.8 1.8 1.95 2.7 V max 2.2 Dynamic characteristics Dynamic load response 200 Sec to 1% 200 Sec to 1% 50 Sec to 1% of 100 Sec to 1% 50 Sec to 1% of (50-75-50% load step) of final value of final value final value of final value final value Start-up time VIN to VOUT regulated, mSec 10 max. Remote On/Off to VOUT regulated, mSec 10 max. Switching frequency, KHz 350 20 440 40 400 40 400 380 40 2M hours 2.1M hours 2.2M hours 2M hours 2.1M hours Environmental Calculated MTBF Operating temperature range, C See Derating curves. Operating case temperature, C (no derating) -40 to +85, with derating -40 to +120, model dependent Storage temperature range, C -55 to +125 Thermal protection/ shutdown, C 110-125, model dependent Relative humidity To +85C/85%, non-condensing Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 6 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48 Isolation Voltage Input to Output, Volts min. 2250 Input to baseplate, Volts min. 1500 Baseplate to output, Volts min. 1500 Isolation resistance, M 10-100, model dependent Isolation capacitance, pF 1000 Isolation safety rating Basic insulation Miscellaneous Current limit inception (98% of VOUT, after warmup), Amps 46 Short circuit protection method 37 41 24 35 Current limiting, hiccup autorestart. Remove overload for recovery. Short circuit current, Amps 5 Short circuit duration 12 5 Continuous, output shorted to ground. No damage. Overvoltage protection, Volts (via magnetic feedback) 2.95 2.95 4 4.6 4 Dynamic characteristics Dynamic load response 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% 200 Sec to 1.5% 200 Sec to 1% (50-75-50% load step) of final value of final value of final value of final value of final value Start-up time VIN to VOUT regulated, mSec 10 max. Remote On/Off to VOUT regulated, mSec 10 max. Switching frequency, KHz 480 480 30 350 10 330 40 330 40 2.1M hours 2.2M hours 1.7M hours 1.8M hours 1.7M hours Environmental Calculated MTBF Operating temperature range, C See Derating curves. Operating case temperature, C (no derating) -40 to +85, with derating -40 to +120, model dependent Storage temperature range, C -55 to +125 Thermal protection/ shutdown, C 110-125, model dependent Relative humidity To +85C/85%, non-condensing Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 7 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-3.3/40-D48 UCQ-5/20-D24 UCQ-5/20-D48 UCQ-5/25-D48 UCQ-12/8.3-D48 UCQ-15/6.7-D48N-C 10 9 Isolation Voltage Input to Output, Volts min. 2250 Input to baseplate, Volts min. 1500 Baseplate to output, Volts min. 1500 Isolation resistance, M 10-100, model dependent Isolation capacitance, pF 1000 Isolation safety rating Basic insulation Miscellaneous Current limit inception (98% of VOUT, after warmup), Amps 49 26 Short circuit protection method 22 27 Current limiting, hiccup autorestart. Remove overload for recovery. Short circuit current, Amps 15 5 5 Short circuit duration 5 TBD 2 Continuous, output shorted to ground. No damage. Overvoltage protection, Volts (via magnetic feedback) 4.25 6.25 TBD 6.2 14.4 18 Dynamic characteristics Dynamic load response 50 Sec to 1% of 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% 150 Sec to 2% of final value (50-75-50% load step) final value of final value of final value of final value of final value Start-up time VIN to VOUT regulated, mSec 5 4 10 max. 10 max. 10 max. 10 max. Remote On/Off to VOUT regulated, mSec 5 4 10 max. 10 max. 10 max. 10 max. 360 20 400 24 315 30 315 30 330 40 300 30 KHz 2.2M hours 2.2M hours TBD 1.7M hours 1.8M hours TBD Switching frequency, KHz Environmental Calculated MTBF Operating temperature range, C. See Derating curves. Operating case temperature, C (no derating) -40 to +85, with derating -40 to +120, model dependent Storage temperature range, C -55 to +125 Thermal protection/ shutdown, C 110-125, model dependent Relative humidity -40 to +110 To +85C/85%, non-condensing Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 8 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters FUNCTIONAL SPECIFICATIONS UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48 Physical Outline dimensions See mechanical specs. Pin material Copper alloy Pin diameter 0.040/0.062 inches (1.016/1.575 mm) Pin finish Nickel underplate with gold overplate Weight, ounces 0.9 1.06 0.9 0.9 1.23 Weight, grams 25 30 25 25 35 Electromagnetic interference Designed to meet EN55022/CISPR22 (External filter required) Safety Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1 UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48 Physical Outline dimensions See mechanical specs. Pin material Copper alloy Pin diameter 0.040/0.062 inches (1.016/1.575 mm) Pin finish Nickel underplate with gold overplate Weight, ounces 1.06 1.06 1.06 0.7 1.06 Weight, grams 30 30 30 20 30 Electromagnetic interference Designed to meet EN55022/CISPR22 (External filter required) Safety Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1 UCQ-3.3/40-D48 UCQ-5/20-D24 UCQ-5/20-D48 UCQ-5/25-D48 UCQ-12/8.3-D48 UCQ-15/6.7-D48N-C Physical Outline dimensions See mechanical specs. Pin material Copper alloy Pin diameter 0.040/0.062 inches (1.016/1.575 mm) Pin finish Nickel underplate with gold overplate Weight, ounces 1.25 1.06 1.06 1.06 1.13 1.034 Weight, grams 35.5 30 30 30 32 29.3 Electromagnetic interference Safety Designed to meet EN55022/CISPR22 (External filter required) Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1 Specs are typical unless noted. www.murata-ps.com/support MDC_UCQ Models.B20 Page 9 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters Specification Notes (1) All models are tested and specified with external 1||10 F ceramic/tantalum output capacitors no external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. All specifications are typical unless noted. General conditions for Specifications are +25 deg.C, VIN and VOUT = nominal, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is CIN = 33 F, 100V tantalum, CBUS = 220 F, 100V electrolytic, LBUS = 12 H. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing altitude. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard = +25 deg.C, full output load, natural air convection. (5) The On/Off Control is normally controlled by a switch or open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. (8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction. (9) All models are fully operational and meet published specifications, including "cold start" at -40 C. (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use 1% or better tolerance metal-film resistors mounted close to the converter. (12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (15) Input Fusing: To ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +VIN input. Use approximately twice the full input current rating with nominal input voltage. (16) "Hiccup" overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation. (17) Normally, the Sense lines are connected at the remote load to compensate for IR voltage drops in the power wiring and to improve dynamic response. If Sense is not used, each Sense pin should be connected at the converter to its respective Vout pin. Product Adaptations Murata Power Solutions offers several variations of our core product family. These products are available under scheduled quantity orders and may also include separate manufacturing documentation from a mutually agreeable Product Specification. Since these product adaptations largely share a common parts list and similar specifications and test methods with their root products, they are provided at excellent costs and delivery. Please contact Murata Power Solutions for details. As of this date, the following products are available: UCQ-1.2/30-D48NHL2-Y These models are all negative On/Off polarity, no baseplate, conformal coating added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with lead). UCQ-3.3/30-D48NBHL2-Y UCQ-3.3/40-D48NBHL2-Y These models are all negative On/Off polarity, baseplate installed, conformal coating added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with lead). UCQ-1.8/30-D48NHL2-Y Absolute Maximum Ratings UCQ-1.8/40-D48NHL2-Y UCQ-2.5/30-D48NHL2-Y UCQ-2.5/40-D48NHL2-Y UCQ-5/20-D48NHL2-Y UCQ-12/8.3-D48NHL2-Y Input Voltage Continuous Transient (100msec) 24V Models 0 to +36 Volts +50 Volts On/Off Control Input Reverse Polarity Protection Output Current 0V min. to +13.5V max. See Fuse section Current-limited. Devices can withstand sustained short circuit without damage. -40 to +100C (with derating) -55 to +125C Operating Temperature Storage Temperature 48V Models 0 to +75 Volts +100 Volts These 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, nor recommended. www.murata-ps.com/support MDC_UCQ Models.B20 Page 10 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-1.2/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow UCQ-1.2/30-D48 Efficiency vs Line Voltage and Load Current @25 C 95 35 90 85 30 Output Current (Amps) Efficiency (%) 80 75 70 VIN = 36V 65 VIN = 48V VIN = 75V 60 55 25 20 400 LFM 300 LFM 15 200 LFM 100 LFM 10 50 5 45 40 3 6 9 12 15 18 21 24 27 75 0 30 30 35 40 45 Load Current (Amps) 50 55 60 65 70 75 80 65 70 75 80 65 70 75 80 Ambient Temperature (C) UCQ-1.5/25-D48 Efficiency vs Line Voltage and Load Current @25 C UCQ-1.5/25-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 90 30 88 86 84 25 Output Current (Amps) Efficiency (%) 82 80 78 VIN = 75V 76 74 VIN = 48V 72 VIN = 36V 70 68 20 15 10 400 LFM 300 LFM 66 200 LFM 5 64 100 LFM 62 60 3 4 5 6 7 8 9 0 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 30 35 40 45 Load Current (Amps) 50 55 60 Ambient Temperature (C) UCQ-1.8/30-D48 Efficiency vs Line Voltage and Load Current @25 C UCQ-1.8/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 90 32 88 30 84 Output Current (Amps) Efficiency (%) 86 VIN = 36V 82 VIN = 48V 80 VIN = 75V 78 76 28 26 24 22 400 LFM 74 300 LFM 200 LFM 20 72 100 LFM Natural convection 70 4 6 8 10 12 14 16 18 20 Load Current (Amps) 22 24 26 28 30 18 30 35 40 45 50 55 60 Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 11 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES 20 85 18 Efficiency (%) VIN = 75V VIN = 48V 16 75 14 VIN = 36V 70 12 65 10 60 8 55 6 50 45 40 Power Dissipation (watts) 90 80 UCQ-1.8/40-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from Vin to Vout) 22 35 Output Current (Amps) UCQ-1.8/40-D48 Efficiency and Power Dissipation @25 C 95 30 400 LFM 25 300 LFM 200 LFM 20 100 LFM 15 Natural Convection 10 4 5 Power Dissipation VIN = 48V 45 2 0 40 4 8 12 16 20 24 28 32 36 40 0 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Load Current (Amps) UCQ-2.5/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 24V (at sea level) UCQ-2.5/30-D48 Efficiency vs Line Voltage and Load Current @25 C 95 35 90 85 30 Output Current (Amps) Efficiency (%) 80 75 VIN = 75V 70 VIN = 48V 65 VIN = 36V 60 55 25 20 15 400 LFM 10 300 LFM 50 200 LFM 5 45 40 1 3 6 9 12 15 18 21 24 27 100 LFM 0 30 30 35 40 45 Load Current (Amps) 50 55 60 65 70 75 80 65 70 75 80 Ambient Temperature (C) UCQ-2.5/40-D24 Efficiency vs Line Voltage and Load Current @25 C UCQ-2.5/40-D24 Maximum Current Temperature Derating No baseplate, VIN = 24V (at sea level) 95 35 90 30 VIN = 24V 80 Output Current (Amps) Efficiency (%) 85 VIN = 18V 75 VIN = 35V 70 65 60 25 20 15 10 400 LFM 300 LFM 5 55 200 LFM 100 LFM 50 3 6 9 12 15 18 21 24 27 30 33 36 39 40 0 30 35 40 45 50 55 60 Load Current (Amps) Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 12 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-3.3/20-D48 Efficiency vs Line Voltage and Load Current @25C 95 UCQ-3.3/20-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, longitudinal airflow, no baseplate) 18 20 15 12 VIN = 36V 80 9 VIN = 48V 75 6 VIN = 75V 18 Output Current (Amps) 85 Power Dissipation (watts) Efficiency (%) 90 100 LFM 16 200 LFM 14 300 LFM 400 LFM 12 70 3 Power Dissipation VIN = 48V 65 10 0 2 5 8 11 14 17 30 35 40 45 50 55 60 65 Ambient Temperature (C) 20 70 75 80 85 75 80 85 Load Current (Amps) UCQ-3.3/30-D48 Efficiency vs Line Voltage and Load Current @25C 95 UCQ-3.3/30-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from Vin to Vout) 15 30 85 9 VIN = 36V VIN = 48V 80 6 VIN = 75V Power Dissipation VIN = 48V 75 3 28 Output Current (Amps) 12 Power Dissipation (watts) Efficiency (%) 90 26 24 100 LFM 22 20 3 6 9 12 15 18 21 24 27 0 30 300 LFM 400 LFM 18 16 70 200 LFM 30 35 40 45 50 55 60 65 70 Ambient Temperature (C) Load Current (Amps) www.murata-ps.com/support MDC_UCQ Models.B20 Page 13 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-3.3/35-D24 Efficiency vs Line Voltage and Load Current @25 C 92 90 88 Efficiency (%) 86 84 VIN = 36V 82 80 VIN = 24V 78 VIN = 18V 76 74 72 70 3 5 7 9 11 15 17 19 21 23 25 27 29 31 33 35 Load Current (Amps) UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level (VIN = 24V, no baseplate, airflow is from -Vin to +Vin) 40 40 35 35 30 30 Output Current (Amps) Output Current (Amps) UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level (VIN = 24V, with baseplate, airflow is from -Vin to +Vin) 25 20 400 LFM 300 LFM 15 200 LFM 100 LFM 10 25 20 400 LFM 15 300 LFM 200 LFM 10 100 LFM Natural Convection 5 Natural Convection 5 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 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 14 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-3.3/40-D48 Efficiency and Power Dissipation @25 C 95 22 90 20 85 Efficiency (%) 80 VIN = 48V Power Dissipation (watts) 18 VIN = 75V 16 75 14 VIN = 36V 70 12 65 10 60 8 55 6 50 4 Power Dissipation VIN = 48V 45 40 4 8 12 16 20 24 28 32 2 36 40 0 Load Current (Amps) UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, transverse airflow) 50 50 40 40 Output Current (Amps) Output Current (Amps) UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, with baseplate, transverse airflow) 30 400 LFM 20 300 LFM 200 LFM 100 LFM 10 30 20 400 LFM 300 LFM 200 LFM 10 Natural Convection 100 LFM Natural Convection 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 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 15 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-5/20-D24 Efficiency and Power Dissipation @25C 96 14 92 Efficiency (%) 10 84 VIN = 18V 80 8 VIN = 24V 76 6 VIN = 36V 72 4 Power Dissipation VIN = 24V 68 Power Dissipation (watts) 12 88 2 64 60 3 4 5 6 7 8 0 9 10 11 12 13 14 15 16 17 18 19 20 Load Current (Amps) UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level (VIN = 24V, no baseplate, airflow is from -Vin to +Vin) UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level (VIN = 24V, with baseplate, airflow is from -Vin to +Vin) 22 25 20 20 Output Current (Amps) Output Current (Amps) 18 16 14 100 LFM 12 200 LFM 10 8 300 LFM 6 100 LFM 15 200 LFM 10 300 LFM 400 LFM 400 LFM 5 4 2 0 30 35 40 45 50 55 60 65 70 75 80 0 85 30 35 40 45 Ambient Temperature (C) 50 55 60 65 Ambient Temperature (C) 70 75 80 85 75 80 85 UCQ-5/20-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from -Vin to +Vin) UCQ-5/20-D48 Efficiency vs Line Voltage and Load Current @25C 22 95 20 18 Output Current (Amps) Efficiency (%) 90 85 VIN = 36V 80 VIN = 50V 16 100 LFM 14 200 LFM 12 300 LFM 10 400 LFM 8 6 VIN = 75V 75 4 2 0 30 70 4 6 8 10 12 14 16 18 20 35 40 45 50 55 60 65 Ambient Temperature (C) 70 Load Current (Amps) www.murata-ps.com/support MDC_UCQ Models.B20 Page 16 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-5/25-D48 Efficiency and Power Dissipation @25 C 95 UCQ-5/25-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from Vin to Vout) 18 30 90 16 75 12 10 VIN = 36V 70 8 65 6 60 4 9 11 13 15 17 19 Load Current (Amps) 21 23 95 18 90 16 14 VIN = 75V 12 VIN = 48V 75 70 10 8 VIN = 36V 65 6 1.6 2.4 3.2 4 4.8 5.6 45 50 55 60 65 70 75 80 85 6.4 7.2 75 80 85 8 7 6 5 400 LFM 4 300 LFM 3 200 LFM 100 LFM 2 2 1 0 8.3 0 Power Dissipation VIN = 48V 30 35 40 45 50 55 60 65 70 Ambient Temperature (C) Load Current (Amps) UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, with baseplate, longitudinal airflow) 10 9 Output Current (Amps) 50 0.8 40 9 4 60 55 35 UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from Vin to Vout) 20 85 Efficiency (%) 30 Ambient Temperature (C) UCQ-12/8.3-D48 Efficiency and Power Dissipation @25 C 100 80 200 LFM 0 25 Output Current (Amps) 7 400 LFM 300 LFM 10 100 LFM 0 5 15 2 50 3 20 5 Power Dissipation VIN = 48V 55 25 Power Dissipation (watts) Efficiency (%) 80 VIN = 75V Output Current (Amps) 14 VIN = 48V Power Dissipation (watts) 85 8 100 LFM 200 LFM 300 LFM 400 LFM 7 6 5 4 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 17 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES UCQ-15/6.7-D48 Efficiency and Power Dissipation @Ta = 25 C 100 UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, no baseplate, airflow is from Vin to Vout) 15 14 95 10 VIN = 75V 80 9 VIN = 48V 75 8 7 70 VIN = 36V 6 65 5 60 4 Power Dissipation VIN = 48V 55 50 1.2 6.5 Output Current (Amps) 85 11 Loss (watts) 12 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 Load Current (Amps) 5.7 100 LFM 200 LFM 300 LFM 400 LFM 5.5 4.5 3 2 6.2 3.5 1 6.7 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level (VIN = 48V, with baseplate, airflow is from Vin to Vout) 6.5 Output Current (Amps) Efficiency (%) 13 90 100 LFM 5.5 4.5 3.5 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com/support MDC_UCQ Models.B20 Page 18 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TYPICAL PERFORMANCE CURVES 6). 6 RESISTIVE LOAD STEP TO M6DIV 5#1 $ /UTPUT 4RANSIENT 2ESPONSE 6). 6 RESISTIVE LOAD STEP TO M6DIV 5#1 $ /UTPUT 4RANSIENT 2ESPONSE SECDIV SECDIV 5#1 $ %NABLE /N/FF 5#1 $ 2IPPLE AND .OISE 6). 6 )/54 ! 6). 6 )/54 ! RESISTIVE OUTPUT CAPS & CERAMIC \\ & TANTALUM M6DIV 6/54 6DIV #ONTROL 0IN 6DIV MSECDIV SECDIV www.murata-ps.com/support MDC_UCQ Models.B20 Page 19 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters MECHANICAL SPECIFICATIONS UCQ with Optional Baseplate 0.40 (10.2) 2.30 (58.4) A 2.30 (58.4) B A 0.015 minimum clearance between standoffs and highest component 2.00 (50.8) SCREW LENGTH MUST NOT GO THROUGH BASEPLATE B B B A A #M3 THD. X 0.15 DEEP TYPICAL 4 PL. 1.03 (26.2) PINS 1-3, 5-7: 0.040O 0.002 (1.016 0.05) PINS 4, 8: 0.062O 0.002 (1.575 0.05) 0.18 (4.6) 1.45 (36.8) B 1.860 (47.2) 5 6 2 7 3 Case C67 0.600 (15.2) 0.300 (7.6) BOTTOM VIEW 1.45 (36.8) 4 1 0.50 (12.7) 8 0.600 (15.24) 4 EQ. SP. PINS 1-3, 5-7: 0.040O 0.002 (1.016 0.05) PINS 4, 8: 0.062O 0.002 (1.575 0.05) 0.18 (4.6) Dimensions are in inches (mm shown for ref. only). Third Angle Projection Component locations may vary between units. Standard pin length is shown. Please refer to the Part Number Structure for special order pin lengths. Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Components are shown for reference only. DOSA-Compatible I/O Connections Pin 1 2 3 4 Function P32 -Input* Remote On/Off +Input* -Output Pin 5 6 7 8 Function P32 -Sense Output Trim +Sense +Output * These converters are pin-for-pin/plug-compatible to competitive units. Other units may use different pin numbering or alternate outline views. When laying out your PC board, follow the pin FUNCTION. DOSA designates Pin 1 as +Input and Pin 3 as -Input. www.murata-ps.com/support MDC_UCQ Models.B20 Page 20 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. For DATEL UCQ series DC/DC converters, we recommend the use of a fast blow fuse, installed in the ungrounded input supply line with a typical value about twice the maximum input current, calculated at low line with the converter's minimum efficiency. All relevant national and international safety standards and regulations must be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use safety standard, i.e. IEC/EN/UL60950-1. Input Reverse-Polarity Protection If the input voltage polarity is accidentally reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, devices will not begin to regulate properly until the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once operating, devices will not turn off until the input voltage drops below the Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input is brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. Start-Up Time The VIN to VOUT Start-Up Time is the time interval between the point at which the ramping input voltage crosses the Start-Up Threshold and the fully loaded output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears at the converter. The UCQ Series implements a soft start circuit to limit the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Control to VOUT start-up time assumes the converter has its nominal input voltage applied but is turned off via the On/Off Control pin. The specification defines the interval between the point at which the converter is turned on (released) and the fully loaded output voltage enters and remains within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also governed by the internal soft start circuitry and external load capacitance. The difference in start up time from VIN to VOUT and from On/Off Control to VOUT is therefore insignificant. Input Source Impedance The input of UCQ converters must be driven from a low ac-impedance source. The DC/DC's performance and stability can be compromised by the use of highly inductive source impedances. The input circuit shown in Figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. For optimum performance, components should be mounted close to the DC/DC converter. I/O Filtering, Input Ripple Current, and Output Noise All models in the UCQ Series are tested/specified for input reflected ripple current and output noise using the specified external input/output components/ circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from backplane to the DC/DC. Input caps should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of DC/DC converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific system configuration may necessitate additional considerations. TO OSCILLOSCOPE CURRENT PROBE +INPUT LBUS + VIN 3 CBUS CIN - 1 -INPUT CIN = 33F, ESR < 700m: @ 100kHz CBUS = 220F, ESR < 100mW @ 100kHz LBUS = 12H Figure 2. Measuring Input Ripple Current In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) may be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. They function as true filter elements and should be selected for bulk capacitance, low ESR and appropriate frequency response. All external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. Temperature variations for all relevant parameters should also be taken carefully into consideration. The most effective combination of external I/O capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. In Figure 3, the two copper strips simulate real-world PCB impedances between the power supply and its load. In order to minimize measurement errors, scope measurements should be made using BNC connectors, or the probe ground should be less than 1/2 inch and soldered directly to the fixture. Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. Designers will normally use the -Output (pin 4) as the ground/return of the load circuit. You can however, use the +Output (pin 8) as ground/return to effectively reverse the output polarity. Minimum Output Loading Requirements UCQ converters employ a synchronous-rectifier design topology and all models regulate within spec and are stable under no-load to full load conditions. Operation under no-load conditions however might slightly increase the output ripple and noise. www.murata-ps.com/support MDC_UCQ Models.B20 Page 21 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters +SENSE +OUTPUT 7 COPPER STRIP 8 C1 C2 SCOPE RLOAD 4 -OUTPUT 5 -SENSE COPPER STRIP C1 = 1F CERAMIC C2 = 10F TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE Remote Sense Note: The Sense and VOUT lines are internally connected through low-value resistors. Nevertheless, if the sense function is not used for remote regulation the user should connect the +Sense to +VOUT and -Sense to -VOUT at the DC/ DC converter pins. UCQ series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate IR drops in PCB conductors or cabling. The remote sense lines carry very little current and therefore require minimal cross-sectional-area conductors. The sense lines, which are capacitively coupled to their respective output lines, are used by the feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines on a PCB should be run adjacent to dc signals, preferably ground. [VOUT(+)-VOUT(-)] - [Sense(+)-Sense(-)] d 10%VOUT Figure 3. Measuring Output Ripple/Noise (PARD) Thermal Shutdown The UCQ converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC/DC converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. See Performance/Functional Specifications. Output Over-Voltage Protection The UCQ output voltage is monitored for an over-voltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the PWM controller causing the output voltage to decrease. Following a time-out period the PWM will restart, causing the output voltage to ramp to its appropriate value. If the fault condition persists, and the output voltage again climbs to excessive levels, the over-voltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. Current Limiting As soon as the output current increases to approximately 130% of its rated value, the DC/DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point at which the full-power output voltage falls below the specified tolerance. See Performance/Functional Specifications. If the load current, being drawn from the converter, is significant enough, the unit will go into a short circuit condition as described below. Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The UCQ Series is capable of enduring an indefinite short circuit output condition. In cables and discrete wiring applications, twisted pair or other techniques should be used. Output over-voltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between VOUT and Sense in conjunction with trim adjustment of the output voltage can cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Power derating is based on maximum output current and voltage at the converter's output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating, or cause output voltages to climb into the output over-voltage region. Therefore, the designer must ensure: (VOUT at pins) x (IOUT) d rated output power n).054 /54054 3%.3% )/54 3ENSE #URRENT /./&& #/.42/, 42)- n3%.3% #ONTACT AND 0#" RESISTANCE LOSSES DUE TO )2 DROPS ,/!$ 3ENSE 2ETURN )/54 2ETURN ).054 n/54054 #ONTACT AND 0#" RESISTANCE LOSSES DUE TO )2 DROPS Figure 4. Remote Sense Circuit Configuration Trimming Output Voltage UCQ converters have a trim capability (pin 6) that enables users to adjust the output voltage (refer to the trim equations and trim graphs that follow). Adjustments to the output voltage can be accomplished via a trim pot (Figure 5) or a single fixed resistor as shown in Figures 6 and 7. 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. www.murata-ps.com/support MDC_UCQ Models.B20 Page 22 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters 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. Trim adjustments greater than the specified range 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 over-voltage protection circuitry to activate (see Performance Specifications for over-voltage 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 converter's specified rating, or cause output voltages to climb into the output over-voltage region. Therefore: /54054 n).054 3%.3% /./&& #/.42/, 42)- ,/!$ 242)- $/7. n3%.3% ).054 n/54054 Figure 7. Trim Connections To Decrease Output Voltages Using Fixed Resistors (VOUT at pins) x (IOUT) t rated output power The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. n).054 /54054 3%.3% /./&& #/.42/, 42)- n3%.3% ).054 n/54054 Trim Equations 452.3 (For all models except the UCQ-1.2/40-D24 and -1.2/30-D48) ,/!$ RTrimDn (k ) = 5.11 - 10.22 ' Figure 5. Trim Connections Using A Trimpot n).054 /54054 3%.3% /./&& #/.42/, 42)- ).054 ,/!$ Do not exceed the specified trim range or maximum power ratings when adjusting trim. Use 1% precision resistors mounted close to the converter on short leads. q 242)- 50 n3%.3% n/54054 RTrimUp (k ) = 5.11 x VNOM x (1+') - 5.11 - 10.22 1.225 x ' ' Where, ' = | (VNOM - VOUT) / VNOM | VNOM is the nominal, untrimmed output voltage. VOUT is the desired new output voltage. Trim Up Connect trim resistor between trim pin and +Sense Trim Down Connect trim resistor between trim pin and -Sense (For the UCQ-1.2/40-D24 and -1.2/30-D48) Figure 6. Trim Connections To Increase Output Voltages Using Fixed Resistors Trim Down Connect trim resistor between trim pin and -Sense RTrimDn (k ) = 5.11 2' - 2 Trim Up Connect trim resistor between trim pin and +Sense RTrimUp (k ) = 5.11 x VNOM x (1+') 1.225 x ' www.murata-ps.com/support MDC_UCQ Models.B20 Page 23 of 24 Single Output UCQ Models Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters On/Off Control The input-side, remote On/Off Control function (pin 2) can be ordered to operate with either polarity: Positive (no suffix) polarity models are enabled when pin 2 is left open (or is pulled high, applying +3.5V to +13.5V with respect to -Input, pin 1) as per Figure 8. Positive-polarity devices are disabled when pin 2 is pulled low (0 to 0.8V with respect to -Input). Dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current (see Performance Specifications) when activated and withstand appropriate voltage when deactivated. Applying an external voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter. Negative ("N" suffix) polarity devices are off when pin 2 is left open (or pulled high, applying +3.5V to +13.5V), and on when pin 2 is pulled low (0 to 1V) with respect to -Input as shown in Figure 9. +INPUT 3 +INPUT +Vcc 3 +VCC 13V CIRCUIT 2 2 ON/OFF CONTROL 1 ON/OFF CONTROL 5V CIRCUIT -INPUT 1 Figure 8. Driving the Negative Polarity On/Off Control Pin (simplified circuit) -INPUT Figure 9. Driving the Negative Polarity On/Off Control Pin (simplified circuit) 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: Maximum Preheat Temperature For Sn/Pb based solders: 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. (c) 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_UCQ Models.B20 Page 24 of 24