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UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
ORDERING GUIDE SUMMARY Model All Models VOUT Range 1.2V to 48V IOUT Range 2.5A to 40A VIN Range 18-36V or 36-75V Efficiency Up to 92.%, model dependent
INPUT CHARACTERISTICS Parameter Voltage Range Current, full power Isolation
Typical unit
Typ. @ 25C, full load 18-36 or 36-75 Volts Up to 5.6 Amps 2kVdc to 2250V Switch or FET control
Notes 24V or 48V nominal Model dependent Model dependent Positive or negative logic
Remote On/Off Control OUTPUT CHARACTERISTICS Parameter Voltage Current Accuracy Ripple & Noise (to 20MHz) Line and Load Regulation Overcurrent Protection Overtemperature Protection Efficiency (minimum) GENERAL SPECIFICATIONS Parameter Dynamic Load Response Operating Temperature Range Safety MECHANICAL CHARACTERISTICS With baseplate Without baseplate
FEATURES

Standard quarter-brick package/pinout Outputs from 1.5 to 48V up to 125W Low profile 0.42" height 24 and 48Vdc nominal inputs Fully isolated, 2250Vdc (BASIC) insulation Designed for RoHS compliance Output overvoltage/short-circuit protected On/Off control, trim and sense functions High efficiency to 92% Protected against temp. and voltage limits Designed to meet UL/IEC/EN60950-1 safety approvals
Typ. @ 25C, full load 1.5 to 48 Volts 10% 2.5 to 40 Amps fullscale Down to 1% of VNOM Down to 35mVp-p Down to 0.125%/0.25% 150% of IOUT max. +125C See Performance Specifications
Notes Trimmable No minimum load Most models Model dependent Model dependent With hiccup auto-restart
Typ. @ 25C, full load Down to 50sec -40 to +110C UL/IEC/EN 60950-1
Notes Model dependent With baseplate, see derating curve and CSA C22.2-No.234
1.45 x 2.30 x 0.5 inches (36.83 x 58.42 x 12.7 mm) 1.45 x 2.30 x 0.42 inches (36.83 x 58.42 x 10.67 mm)
See Performance Specifications, page 2
PRODUCT OVERVIEW
For efficient, fully isolated DC power in the smallest space, Murata Power Solutions' UVQ series quarter bricks offer output voltages from 1.5 to 48 Volts with currents up to 40 Amps. UVQs operate over a wide temperature range (up to +70C at 200 lfm airflow) at full-rated power. The optional mounting baseplate extends this to all practical temperature ranges at full power. UVQ's achieve these impressive specifications while delivering excellent electrical performance. Overall noise is 35mVp-p (3.3V models) with fast step response (down to 50sec). These converters offer high stability even with no load and tight output regulation. The unit is fully protected against input over and undervoltage, output overcurrent and short circuit. An on-board temperature sensor shuts down the converter if thermal limits are reached. Protection uses the "hiccup" (auto restart) method. A convenient remote On/Off control input operates by external digital logic, relay or transistor input. To compensate for longer wiring and to retain output voltage accuracy at the load, UVQ's include a Sense input to dynamically correct for ohmic losses. A trim input may be connected to a user's adjustment potentiometer or trim resistors for output voltage calibration closer than the standard accuracy. UVQ's include industry-standard safety certifications and BASIC I/O insulation provides 2250 Volt input/output isolation. Radiation emission testing is performed to widely-accepted EMC standards. The UVQ's may be considered as higher performance replacements for some MPS USQ models.
Pb
For full details go to www.murata-ps.com/rohs
Lead-free construction/attach
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MDC_UVQ Models.B11 Page 1 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance Specifications and Ordering Guide
ORDERING GUIDE Output VOUT (Volts) 1.5 2.5 3.3 5 12 15 18 24 48 IOUT Power (Amps) (Watts) 40 35 40 30 35 20 8 10 7 5.6 6 4.5 2.5 60 87.5 100 99 115.5 100 96 120 105 100.8 108 R/N (mVp-p) Typ. 30 Max. 60 60 60 65 40 50 25 130 160 150 150 185 185 100 130 200 375 Regulation (Max.) Line 0.075% 0.05% 0.05% 0.1% 0.05% 0.05% 0.05% 0.1% 0.075% 0.05% 0.05% 0.05% 0.05% 0.075% 0.075% 0.1% 0.175% Load 0.05% 0.05% 0.05% 0.25% 0.25% 0.05% 0.05% 0.1% 0.05% 0.05% 0.02% 0.075% 0.075% 0.15% 0.25% 0.2% 0.2% VIN Nom. (Volts) 24 24 48 24 48 24 48 24 48 24 48 24 48 24 48 24 48 Input Range IIN, No Load IIN, Full Load (Volts) (mA) (Amps) 18-36 18-36 36-75 18-36 36-75 18-36 36-75 18-36 36-75 18-36 36-75 18-36 36-75 18-36 36-75 18-36 36-75 80 100 100 180 130 180 80 90 60 103 60 140 80 45 45 45 30 2.84 4.14 2.37 4.58 2.7 4.53 2.31 4.4 2.78 4.85 2.39 4.69 2.5 5.03 2.49 4.4 2.71 Efficiency) Min. 86.5% 86% 87% 88.5% 87% 91% 88.5% 89% 88.5% 88.5% 90% 88% 88.3% 88% 89% 89% 91% Typ. 88% 88% 88% 90% 89% 92% 90% 91% 90% 90.3% 91.5% 89.5% 90% 89.5% 90.5% 91% 92.3% Package (Case, Pinout)
Root Models UVQ-1.5/40-D24P-C UVQ-2.5/35-D24P-C UVQ-2.5/40-D48N-C UVQ-3.3/30-D24P-C UVQ-3.3/35-D48N-C UVQ-5/20-D24P-C UVQ-5/20-D48N-C UVQ-12/8-D24P-C UVQ-12/10-D48N-C UVQ-15/7-D24P-C UVQ-15/7-D48N-C UVQ-18/5.6-D24P-C UVQ-18/6-D48N-C UVQ-24/4.5-D24P-C UVQ-24/4.5-D48N-C UVQ-48/2.5-D24P-C UVQ-48/2.5-D48N-C
35
120
30 20 95 110 85 120 125 125 60 75 100 250
C59, P32
c These are partial model numbers. Please refer to the full model number structure for complete ordering part numbers. d Min. IOUT = 3 Amps. e All specifications are at nominal line voltage and full load, +25C unless otherwise noted. See detailed specifications.
Output capacitors are 1uF ceramic || 10 uF electrolytic. Input cap is 22 uF, low ESR, except UVQ-24/4.5 is 33uF and UVQ-48/2.5 uses no input cap. I/O caps are necessary for our test equipment and may not be needed for your application. f IOUT = 14 Amps max. with VIN = 18-19.5 Volts.
UVQ Pin 9 Baseplate Connection The UVQ series may include an optional installed baseplate for extended thermal management. Various UVQ models (see list below) are also available with an additional pin 9 on special order which connects to the baseplate but is electrically isolated from the rest of the converter. Please refer to the mechanical drawings. Pin 9 offers a positive method of controlling the electrical potential of the baseplate, independent of the converter. Some baseplate models cannot include pin 9 and in such cases, the baseplate is grounded by the mounting bolts. Or consider adding an external lugged washer with a grounding terminal. The baseplate may be ordered by adding a "B" to the model number tree and pin 9 will be pre-installed by adding a "9". The two options are separate. Please refer to the Ordering Guide. Do not order pin 9 without the baseplate. Note that "pin 9" converters may be on limited forecast, requiring minimum order quantities and scheduled deliveries.
Models available with Pin 9: UVQ-12/10-D48 UVQ-1.5/40-D24 Models which are NOT available with Pin 9: UVQ-5/20-D24 and -D48 UVQ-3.3/30-D24 UVQ-3.3/35-D48 UVQ-2.5/35-D24 UVQ-2.5/40-D48 Other models which are not listed will be reviewed for future pin 9 accomodation.
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MDC_UVQ Models.B11 Page 2 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
PART NUMBER STRUCTURE
U VQ - 3.3 / 20 - D48 N B 9 LX - C
RoHS-6 hazardous substance compliant Output Configuration
U = Unipolar/Single
Alternate Pin Length: (special quantity order)
Blank = Standard pin length L1 = 0.110 (2.79mm) L2 = 0.145 (3.68mm)
Quarter-Brick Package Nominal Output Voltage
1.2 to 48 Volts
Baseplate Pin 9, see Mechanical Drawings: (special order)
Blank = No pin 9, standard 9 = Pin 9 installed (see description on pg. 2), optional Blank = No baseplate, standard B = Baseplate installed, optional special order
Maximum Rated Output
Current in Amps
Input Voltage Range: D24 = 18-36 Volts (24V nominal) D48 = 36-75 Volts (48V nominal)
Remote On/Off Control Polarity: Some model number combinations may not be Add "P" for positive polarity available. Contact Murata Power Solutions.. Add "N" for negative polarity Positive "P" polarity is standard for D24 models and optional special order for D48 models. Negative "N" polarity is standard for D48 models and optional special order for D24 models.
* Note:
+SENSE (7) +VOUT (8)
+VIN (3)
Baseplate (9) Optional
SWITCH CONTROL -VOUT (4)
-VIN (1)
-SENSE (5) PWM CONTROLLER OPTO ISOLATION REFERENCE & ERROR AMP
VOUT TRIM (6)
INPUT UNDERVOLTAGE, INPUT OVERVOLTAGE, AND OUTPUT OVERVOLTAGE COMPARATORS REMOTE ON/OFF CONTROL* (2)
* Can be ordered with positive (standard) or negative (optional) polarity.
Typical configuration -- some models use a different topology Figure 1. Simplified Schematic
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MDC_UVQ Models.B11 Page 3 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 24V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-1.5/40-D24
UVQ-2.5/35-D24
UVQ-3.3/30-D24
UVQ-18/5.6-D24
UVQ-24/4.5-D24
Input Input voltage range Start-up threshold, (V) min. Undervoltage shutdown, (V)14 Overvoltage shutdown (V) Reflected (back) ripple current2 Input Current Full load conditions Inrush transient, (A2sec) Output short circuit, (mA) No load, mA Low line (VIN = min.), (Amps) Standby mode, (Off, UV, OT shutdown) Internal input filter type Reverse polarity protection Remote On/Off Control5 Positive logic, "P" suffix (specifications are max) Negative logic, "N" suffix (specifications are max) Current OFF = Ground pin to +0.8V ON = Open or +5V to +VIN max. OFF = Open or +5V to +VIN max ON = Ground pin to+0.8V max 1-8 mA, model dependent L-C See notes. 0.5 40 80 3.79 100 5.49 0.5 0.05 50 180 6.04 160 5.57 0.5 See ordering guide. 0.1 10 90 5.93 1 320 103 6.52 1 50 140 6.29 0.05 50 45 6.67 0.05 50 30 3.60 17 17 16 none 17 17 See ordering guide 17 16.25 17 16 39 10-50 mA pk-pk, model dependent 17 16.25 17 16 none 17 16
1-4mA, model dependent Pi-type L-C
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MDC_UVQ Models.B11 Page 4 of 25
UVQ-48/2.5-D24
UVQ-5/20-D24
UVQ-12/8-D24
UVQ-15/7-D24
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 24V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-1.5/40-D24
UVQ-2.5/35-D24
UVQ-3.3/30-D24
UVQ-18/5.6-D24
UVQ-24/4.5-D24
Output Voltage output range Voltage output accuracy (50% load) Adjustment range Temperature coefficient Minimum loading Remote sense compensation Ripple/noise Line/Load regulation Efficiency Maximum capacitive loading, Low ESR <0.02 max., resistive load, (F) Current limit inception (98% of VOUT, after warmup), (Amps) Short circuit protection method Short circuit current, (Amps) Short circuit duration Overvoltage protection, (via magnetic feedback) Isolation Characteristics Isolation Voltage Input to Output, (Volts min) Input to baseplate Baseplate to output, (Volts min) Isolation resistance Isolation capacitance, (pF) Isolation safety rating 1500 1500 1000 100 M 1000 Basic insulation 2000 50 2000 1500 1500 2.3 Volts 3 Volts max 3.6 3 45 10,000 5000 No minimum load 3 amps +10%. See ordering guide. See ordering guide. See ordering guide. 4700 2200 1.5% of VNOM See ordering guide. 1.25% of VNOM -20 to +10% of VNOM. 0.02% of VOUT range per C No minimum load 1% of VNOM 10% of VNOM.
44
36
24
10
9.5
7
5.8
3.4
Current limiting, hiccup autorestart. Remove overload for recovery. 3 3 1.5 15 mA 3 5 2.8
Output may be shorted continuously to ground (no damage). 4 Volts max 6.8 Volts max 14.4 Volts max 18.5 Volts 22 Volts max 29 Volts max 59 Volts max
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MDC_UVQ Models.B11 Page 5 of 25
UVQ-48/2.5-D24
UVQ-5/20-D24
UVQ-12/8-D24
UVQ-15/7-D24
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 24V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-1.5/40-D24
UVQ-2.5/35-D24
UVQ-3.3/30-D24
UVQ-18/5.6-D24
UVQ-24/4.5-D24
Dynamic characteristics Dynamic load response (50-75-50% load step) Start-up time VIN to VOUT regulated, mSec Remote On/Off to VOUT regulated, mSec Switching frequency, (KHz) Environmental Calculated MTBF4 Operating temperature range: see Derating Curves. Operating temperature, with baseplate, no derating required (C)3 Storage temperature (C) Thermal protection/ shutdown Relative humidity Physical Outline dimensions Baseplate material Pin material Pin diameter Weight Electromagnetic interference (conducted and radiated) (external filter required) Safety 1.55 ounce (44 grams) See mechanical specs. Aluminum Brass alloy 0.04/0.062 inches (1.016/1.524 mm) 1 ounce (28 grams) -40 to +110 -55 to +130 +110 to 125C, model dependent To +85C/85%, non-condensing TBD -40 to +85C (with Derating, see Note 15.) 100 Sec to 1% of final value 90msec 90msec 380 30 150 Sec to 150 Sec to 100 Sec to 50 Sec 40 Sec to 50 Sec to 100 Sec 100 Sec 1.5% 1.5% 1.5% of final to 1% 1.25% 1% to 1% to 1% of final value of final value value of final value of final value of final value of final value of final value 50msec 50msec 500 to 650 50msec 50msec 600 200msec 200msec 360 40msec 30msec 290 30 30msec 25msec 242 30msec 35msec 240 25 290msec 200msec 290 30 100msec 100msec 250 25
-40 to +115
-40 to +110 -55 to +125
Designed to meet FCC part 15, class B, EN55022
Designed to meet UL/cUL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
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MDC_UVQ Models.B11 Page 6 of 25
UVQ-48/2.5-D24
UVQ-5/20-D24
UVQ-12/8-D24
UVQ-15/7-D24
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-2.5/40-D48
UVQ-3.3/35-D48
UVQ-24/4.5-D48
Input Input voltage range Start-up threshold, min (V) Undervoltage shutdown, (V)14 Overvoltage shutdown (V) Reflected (back) ripple current Input Current Full load conditions Inrush transient, (A2sec) Output short circuit, (mA) No load, mA Low line (VIN = min.), (Amps) Standby mode, (Off, UV, OT shutdown) Internal input filter type Reverse polarity protection Remote On/Off Control5 Positive logic, "P" suffix (specifications are max) Negative logic, "N" suffix (specifications are max) Current OFF = Ground pin to +0.8V ON = Open or +5V to +VIN max OFF = Open or +5V to +VIN max ON = Ground pin to+0.8V max 1-8 mA, model dependent L-C See notes. 100 3.15 0.05 0.05 50 130 3.56 80 3.07 1 See ordering guide. 1 10 60 3.72 0.05 30 30 3.21 1 50 80 3.35 0.05 250 45 3.30 0.05 50 30 3.60 35 33.5 none 10-50 mA pk-pk, model dependent See ordering guide 34.5 34 32 34.5 35 33.5
1-4mA, model dependent Pi-type L-C
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MDC_UVQ Models.B11 Page 7 of 25
UVQ-48/2.5-D48
UVQ-12/10-D48
UVQ-5/20-D48
UVQ-15/7-D48
UVQ-18/6-D48
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-2.5/40-D48
UVQ-3.3/35-D48
UVQ-24/4.5-D48
Output Voltage output range Voltage output accuracy (50% load) Adjustment range Temperature coefficient Minimum loading Remote sense compensation Ripple/noise Line/Load regulation Efficiency Maximum capacitive loading, Low ESR <0.02 max., resistive load, (F) Current limit inception (98% of VOUT, after warmup), (Amps) Short circuit protection method Short circuit current, (Amps) Short circuit duration Overvoltage protection, (via magnetic feedback) Isolation Characteristics Isolation Voltage Input to Output, (Volts min) Input to baseplate Baseplate to output, (Volts min) Isolation resistance Isolation capacitance, (pF) Isolation safety rating 1500 1000 Basic insulation 1500 100 M 50 50 1500 2250 1500 1500 3 Volts max 4 Volts max 5 46 10,000 No minimum load 3 Amps No minimum load +10%. See ordering guide. See ordering guide. See ordering guide. 4700 2200 1000 1.5% of VNOM See ordering guide. 1.25% of VNOM -20 to +10% of VNOM. 0.02% of VOUT range per C No minimum load 1% of VNOM
48
26
12.5
8.5
7
6.5
3.3
Current limiting, hiccup autorestart. Remove overload for recovery. 0.1 1.5 3 3 3 3.5
Output may be shorted continuously to ground (no damage). 6 Volts max 14.4 Volts max 18.5 Volts max 22 Volts max 29 Volts max 55 Volts max
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MDC_UVQ Models.B11 Page 8 of 25
UVQ-48/2.5-D48
UVQ-12/10-D48
UVQ-5/20-D48
UVQ-15/7-D48
UVQ-18/6-D48
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
UVQ-2.5/40-D48
UVQ-3.3/35-D48
UVQ-24/4.5-D48
Dynamic characteristics Dynamic load response (50-75-50% load step) Start-up time VIN to VOUT regulated, mSec Remote On/Off to VOUT regulated, mSec Switching frequency, (KHz) Environmental Calculated MTBF4 Operating temperature range: see Derating Curves. Operating temperature, with baseplate, no derating required (C)3 Storage temperature (C) Thermal protection/ shutdown Relative humidity Physical Outline dimensions Baseplate material Pin material Pin diameter Weight Electromagnetic interference (conducted and radiated) (external filter required) Safety See mechanical specs. Aluminum Brass alloy 0.04/0.062 inches (1.016/1.524 mm) 1 ounce (28 grams) -40 to +110 TBD -40 to +85C (with Derating, see Note 15.) 150 Sec to 1.5% of final value 50msec 50msec 600 150 Sec to 1.5% of final value 50msec 50msec 600 90 Sec 100 Sec 50 Sec to 1% 50 Sec to 1% 50 Sec to 1% to 2% to 1% of final value of final value of final value of final value of final value 50msec 50msec 450 50 40msec 30msec 290 30 30msec 30msec 245 20 30msec 30msec 240 25 100msec 100msec 290 30 75 Sec to 1% of final value 50msec 50msec 540 40
-40 to +115 -55 to +125 +110 to 125C, model dependent To +85C/85%, non-condensing
-40 to +110
-40 to +110
-40 to +120
Designed to meet FCC part 15, class B, EN55022
Designed to meet UL/cUL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
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MDC_UVQ Models.B11 Page 9 of 25
UVQ-48/2.5-D48
UVQ-12/10-D48
UVQ-5/20-D48
UVQ-15/7-D48
UVQ-18/6-D48
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
PART NUMBER STRUCTURE
Input Voltage Continuous Transient (100 mS) On/Off Control Input Reverse Polarity Protection Output Overvoltage Output Current (Note 7) Storage Temperature Lead Temperature
24V models 0 to +36V +50V See Fuse section VOUT +20% max.
48V models 0 to +75V +100V
MECHANICAL SPECIFICATIONS
-0.3 V min to +13.5V max.
Removal of Soldered UVQ's from Printed Circuit Boards Should removal of the UVQ from its soldered connection be needed, thoroughly de-solder the pins using solder wicks or de-soldering tools. At no time should any prying or leverage be used to remove boards that have not been properly de-soldered first. Input Source Impedance UVQ converters must be driven from a low ac-impedance input 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 UVQ Series are tested/specified for input ripple current (also called input reflected ripple current) and output noise using the circuits and layout shown in Figures 2 and 3.
Current-limited. Devices can withstand sustained short circuit without damage. -55 to +125C See soldering guidelines
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 nor recommended.
(1) All models are tested and specified with 200 LFM airflow, external 1||10F ceramic/ tantalum output capacitors. External input capacitance varies according to model type. 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. General conditions for Specifications are +25C, VIN =nominal, VOUT = nominal, full load. (2) Input Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is CIN = 33F tantalum, CBUS = 220F electrolytic, LBUS = 12H. (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. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, TPCBOARD = +25C, full output load, natural air convection. (5) The On/Off Control may be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. The On/Off Control Input should use either an open collector/open drain transistor or logic gate which does not exceed +13.5V. (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 -40C. (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) Overvoltage shutdown on 48V input models is not supplied in order to comply with telecom reliability requirements. These requirements attempt continued operation despite significant input overvoltage. (12) Do not exceed maximum power specifications when adjusting the output trim. (13) Note that the converter may operate up to +110C with the baseplate installed. However, thermal self-protection occurs near +110C, and there is a temperature gradient between the hotspot and the baseplate. Therefore, +100C is recommended to avoid thermal shutdown. (14) The converter is guaranteed to turn off at the UV shutdown voltage. (15) At full power, the package temperature of all on-board components must not exceed +128C.
TO OSCILLOSCOPE
CURRENT PROBE LBUS
3
+INPUT
+ VIN - CBUS
CIN 1
-INPUT
CIN = 33F, ESR < 700m @ 100kHz CBUS = 220F, ESR < 100m @ 100kHz LBUS = 12H
Figure 2. Measuring Input Ripple Current
External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements. They 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.
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MDC_UVQ Models.B11 Page 10 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) can be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. Output capacitors function as true filter elements and should be selected for bulk capacitance, low ESR, and appropriate frequency response. In Figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. 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. 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 be taken into consideration. OS-CONTM organic semiconductor capacitors (www.sanyo.com) can be especially effective for further reduction of ripple/noise. 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. On/Off Control The primary-side, Remote On/Off Control function (pin 2) can be specified to operate with either positive or negative polarity. Positive-polarity devices ("P" suffix) are enabled when pin 2 is left open or is pulled high. Positivepolarity devices are disabled when pin 2 is pulled low (0-0.8V with respect to -Input). Negative-polarity devices are off when pin 2 is high/open and on when pin 2 is pulled low. See Figure 4. Dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current (see Performance Specifications) when activated and withstand appropriate voltage when deactivated.
+SENSE +OUTPUT
7 8
COPPER STRIP
C1 4 -OUTPUT 5 -SENSE
C2
SCOPE
RLOAD
Figure 4. Driving the Remote On/Off Control Pin
COPPER STRIP
C1 = 1F CERAMIC C2 = 10F TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
Start-Up Threshold and Undervoltage Shutdown Under normal start-up conditions, the UVQ Series will not begin to regulate properly until the ramping input voltage exceeds the Start-Up Threshold. Once operating, devices will turn off when the applied voltage drops below the Undervoltage Shutdown point. Devices will remain off as long as the undervoltage condition continues. Units will automatically re-start when the applied voltage is brought back above the Start-Up Threshold. The hysteresis built into this function avoids an indeterminate on/off condition at a single input voltage. See Performance/Functional Specifications table for actual limits. Start-Up Time The VIN to VOUT Start-Up Time is the interval between the point at which a ramping input voltage crosses the Start-Up Threshold voltage and the point at which the fully loaded output voltage enters and remains within its specified r1% accuracy band. Actual measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears to the converter. The On/Off to VOUT start-up time assumes that the converter is turned off via the Remote On/Off Control with the nominal input voltage already applied.
Current Limiting When power demands from the output falls within the current limit inception range for the rated output current, the DC/DC converter will go into a current limiting mode. In this condition the output voltage will decrease proportionately with increases in output current, thereby maintaining a somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point where the full-power output voltage falls below the specified tolerance. If the load current being drawn from the converter is significant enough, the unit will go into a short circuit condition. See "Short Circuit Condition." Short Circuit Condition When a converter is in current limit mode the output voltages will drop as the output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period of about 50 milliseconds, the PWM will restart, causing the output voltages to begin ramping to their appropriate values. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The UVQ is capable of enduring an indefinite short circuit output condition.
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MDC_UVQ Models.B11 Page 11 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Thermal Shutdown UVQ converters are equipped with thermal-shutdown circuitry. If the internal temperature of the DC/DC converter rises above the designed operating temperature (See Performance Specifications), a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. Output Overvoltage Protection The output voltage is monitored for an overvoltage condition via magnetic coupling to the primary side. If the output voltage rises to a fault condition, which could be damaging to the load circuitry (see Performance Specifications), the sensing circuitry will power down the PWM controller causing the output voltage to decrease. Following a time-out period the PWM will restart, causing the output voltage to ramp to its appropriate value. If the fault condition persists, and the output voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. 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 the source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of a sustained, non-current-limited, input-voltage polarity reversal exists. For MPS UVQ Series DC/DC Converters, slow-blow fuses are recommended with values no greater than twice the maximum input current. Trimming Output Voltage UVQ converters have a trim capability (pin 6) that enables users to adjust the output voltage from +10% to -20% (refer to the trim equations). Adjustments to the output voltage can be accomplished with a single fixed resistor as shown in Figures 5 and 6. A single fixed resistor can increase or decrease the output voltage depending on its connection. Resistors should be located close to the converter and have TCR's less than 100ppm/C to minimize sensitivity to changes in temperature. If the trim function is not used, leave the trim pin open.
1
-INPUT
+OUTPUT
8
+SENSE 2 ON/OFF CONTROL
7
TRIM
6 RTRIM DOWN
LOAD
-SENSE 3 +INPUT
5
-OUTPUT
4
Figure 6. Trim Connections To Decrease Output Voltages Using Fixed Resistors
Standard UVQ's 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. Trim adjustments greater than the specified +10%/-20% 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 UVQ's specified rating, or cause output voltages to climb into the output overvoltage region. Therefore: (VOUT at pins) x (IOUT) d 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. 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. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100 C. for 30 minutes). Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
1
-INPUT
+OUTPUT
8
+SENSE 2 ON/OFF CONTROL
7
TRIM
6 RTRIM UP
LOAD
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders: Maximum Preheat Temperature 115 C. 270 C. 7 seconds
-SENSE 3 +INPUT
5
-OUTPUT
4
Maximum Pot Temperature Maximum Solder Dwell Time For Sn/Pb based solders:
Figure 5. Trim Connections To Increase Output Voltages Using Fixed Resistors
Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time
105 C. 250 C. 6 seconds
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MDC_UVQ Models.B11 Page 12 of 25
UVQ Series
Trim Equations Trim Up Trim Down
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
F E AT U R E S A N D O P T I O N S
Remote Sense Note: The Sense and VOUT lines are internally connected through lowvalue resistors. Nevertheless, if the sense function is not used for remote regulation the user must connect the +Sense to +VOUT and -Sense to -VOUT at the DC/DC converter pins. UVQ series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate IR drops in pcb conductors or cabling. The remote sense lines carry very little current and therefore require minimal cross-sectional-area conductors. The sense lines, which are capacitively coupled to their respective output lines, are used by the feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines on a pcb should be run adjacent to dc signals, preferably ground. In cables and discrete wiring applications, twisted pair or other techniques should be implemented. UVQ series converters will compensate for drops between the output voltage at the DC/DC and the sense voltage at the DC/DC provided that: [VOUT(+) -VOUT(-)] - [Sense(+) -Sense (-)] 10% VOUT
UVQ-1.5/40-D24
RT UP (k:) = 6.23(VO - 1.226) VO - 1.5 -10.2 RTDOWN (k:) = 7.64 1.5 - VO -10.2
UVQ-2.5/40-D48, UVQ-2.5/35-D24
RT UP (k:) = 10(VO - 1.226) VO - 2.5 -10.2 RTDOWN (k:) = 12.26 2.5 - VO -10.2
UVQ-3.3/35-D48
RT UP (k:) = 13.3(VO - 1.226) VO - 3.3 -10.2 RTDOWN (k:) = 16.31 3.3 - VO -10.2
UVQ-5/25-D24, UVQ-5/20-D48
RT UP (k:) = 20.4(VO - 1.226) VO - 5 -10.2 RTDOWN (k:) = 25.01 5 - VO -10.2
UVQ-12/8-D24, -12/10-D48
RT UP (k:) = 49.6(VO - 1.226) VO - 12 -10.2 RTDOWN (k:) = 60.45 12 - VO -10.2
1
Contact and PCB resistance losses due to IR drops -INPUT +OUTPUT 8 IOUT Sense Current 2 ON/OFF CONTROL TRIM 6 Sense Return 5 IOUT Return LOAD
UVQ-15/7-D24, -D48
RT UP (k:) = 62.9(VO - 1.226) VO - 15 -10.2 RTDOWN (k:) = 76.56 15 - VO -10.2
+SENSE
7
UVQ-18/5.6-D24, -18/6-D48
RT UP (k:) = 75.5(VO - 1.226) VO - 18 -10.2 RTDOWN (k:) = 92.9 18 - VO
3
-SENSE +INPUT
-10.2
-OUTPUT
4 Contact and PCB resistance losses due to IR drops
UVQ-24/4.5-D24, -D48
RT UP (k:) = 101(VO - 1.226) VO - 24 -10.2 RTDOWN (k:) = 124.2 24 - VO -10.2
Figure 8. Remote Sense Circuit Configuration
UVQ-48/2.5-D24, -D48
RT UP (k:) = 210.75(VO - 1.226) VO - 48 -10.2 RTDOWN (k:) = 250 48 - VO -10.2
Note: Higher output 24V and 48V converters require larger, low-tempco, precision trim resistors. An alternative is a low-TC multi-turn potentiometer (20k typical) connected between +VOUT and -VOUT with the wiper to the Trim pin.
Output overvoltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between VOUT and Sense in conjunction with trim adjustment of the output voltage can cause the overvoltage protection circuitry to activate (see Performance Specifications for overvoltage limits). Power derating is based on maximum output current and voltage at the converter's output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the conveter's specified rating, or cause output voltages to climb into the output overvoltage region. Therefore, the designer must ensure: (VOUT at pins) x (IOUT) rated output power
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MDC_UVQ Models.B11 Page 13 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-1.5/40-D24N: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow)
40 40
UVQ-1.5/40-D24N: Maximum Current Temperature Derating (With baseplate, VIN = 24V, transverse air flow)
39
39
Output Current (Amps)
Natural convection
38
Output Current (Amps)
Natural convection
38
100 lfm
37
37
200 lfm
36
100 lfm
36
200 lfm 400 lfm
400 lfm
35
35
34
34
33 20 25 30 35 40 45 50 55 60 65 70 75 80 85
33 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature ( C)
Ambient Temperature ( C)
UVQ-2.5/40-D48N Efficiency vs. Line Voltage and Load Current @ 25C 92 88 84 Efficiency (%) 80 76 Power Dissipation (Watts) 16 14 12
UVQ-2.5/40-D48 Power Dissipation vs. Load Current @ 25C
VIN = 48V
10 8 6 4 2 0
VIN = 36V
72
VIN = 48V
68
VIN = 75V
64 62 0 5 10 15 20 25 30 35 40 Load Current (Amps)
0
5
10
15
20
25
30
35
40
Load Current (Amps)
UVQ-3.3/30-D24N: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow at sea level)
30 29 28 30 29
UVQ-3.3/30-D24N: Maximum Current Temperature Derating (With baseplate, VIN = 24V, transverse air flow at sea level)
Output Current (Amps)
27 26 25 24 23 22 21 20 19 18 17 20 25
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
Output Current (Amps)
28
Natural convection
27
100 lfm
26
200 lfm
25
300 lfm
24
400 lfm
23 22 21
30
35
40
45
50
55
60
65
70
75
80
85
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
Ambient Temperature ( C)
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MDC_UVQ Models.B11 Page 14 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-3.3/35-D48 Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow at sea level)
36 34
Output Current (Amps)
32 30 28 26 24 200 lfm 22 300 lfm 20 400 lfm 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Natural Convection 100 lfm
Ambient Temperature ( C)
UVQ-5/20-D24P: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow)
UVQ-5/20-D24PB: Maximum Current Temperature Derating (With baseplate, VIN = 24V, transverse air flow)
20 19.5 19
Output Current (Amps) Output Current (Amps)
20 19.5 19 18.5 18 17.5 17 16.5 16 15.5
20 25 30 35 40 45 50 55 60 65 70 75 80 85
18.5 18 17.5 17 16.5 16 15.5 15 14.5 14
Ambient Temperature ( C)
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
UVQ-5/20-D24P Efficiency vs. Line Voltage and Load Current @ +25C
UVQ-5/20-D24 Power Dissipation vs. Load Current @ +25C
94 93 92 91
Efficiency (%) Power Dissipation (Watts)
10 9 8 7 6 5 4 3 2 1 5 6.5 8 9.5 11 12.5 14 15.5 17 18.5 20 5 6.5 8 9.5 11 12.5 14 15.5 17 18.5 20
Load Current (Amps) Load Current (Amps)
VIN = 18V
90 89 88 87 86 85 84
VIN = 24V VIN = 30V VIN = 36V
VIN = 18V VIN = 24V VIN = 30V VIN = 36V
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MDC_UVQ Models.B11 Page 15 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-5/20-D48 Efficiency vs. Line Voltage and Load Current @ 25C 92 88 84 Efficiency (%) 80 76
21 20
UVQ-5/20-D48P: Maximum Current Temperature Derating (No baseplate, VIN = 48V, transverse air flow at sea level)
Output Current (Amps)
19 18
100 lfm
17
200 lfm
16
VIN = 36V
72
300 lfm
15
VIN = 48V
68
400 lfm
14
Natural convection
VIN = 75V
64
13 12 20 25 30 35 40 45 50 55 60 65 70 75 80 85
62 0 2 4 6 8 10 12 14 16 18 20
Ambient Temperature ( C)
Load Current (Amps)
UVQ-5/20-D48PB: Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow at sea level)
21 20
Output Current (Amps)
19 18 17 16 15 14 13 20 25 30 35 40 45 50 55 60 65 70 75 80 85
100 lfm 200 lfm 300 lfm 400 lfm
Ambient Temperature ( C)
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MDC_UVQ Models.B11 Page 16 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-12/8-D24P Efficiency vs. Line Voltage and Load Current @ +25C
UVQ-12/8-D24P: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow)
95
8.0
Output Current (Amps)
7.8 7.6 7.4 7.2 7.0 6.8 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Ambient Temperature ( C)
90
Efficiency (%)
100 lfm 200 lfm 300 lfm
VIN = 18V
85
VIN = 24V VIN = 30V
80
VIN = 36V
75 0.8 1.6 2.4 3.2 4 4.8 5.6 6.4 7.2 8
Load Current (Amps)
UVQ-12/10-D48N: Maximum Current Temperature Derating (No baseplate, VIN = 48V, transverse air flow)
UVQ-12/10-D48N: Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow)
10.0 9.5
10
Output Current (Amps)
Output Current (Amps)
9
9.0 8.5 8.0 7.5 7.0 6.5 6.0
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
8
7
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
6
5 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature ( C)
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
UVQ-12/10-D48N Efficiency vs. Line Voltage and Load Current @ +25C
UVQ-12/10-D48N Power Dissipation vs. Load Current @ +25C
15
92
13
90
Power Dissipation (Watts)
11 9 7 5 3 1
VIN = 75V VIN = 60V VIN = 48V VIN = 36V
88
Efficiency (%)
VIN = 36V VIN = 48V VIN = 60V VIN = 75V
86 84 82 80 78 1 2 3 4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
Load Current (Amps)
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MDC_UVQ Models.B11 Page 17 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-15/7-D24N: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow) UVQ-15/7-D24N: Maximum Current Temperature Derating (With baseplate, VIN = 24V, transverse air flow)
7.5 7
Output Current (Amps)
7.5 7
Output Current (Amps)
6.5 6 5.5 5 4.5 4
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
6.5 6 5.5 5 4.5 4
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
Ambient Temperature ( C)
Ambient Temperature ( C)
UVQ-15/7-D24N Efficiency vs. Line Voltage and Load Current @ +25C
UVQ-15/7-D24N Power Dissipation vs. Load Current @ +25C
94 92 90
Efficiency (%) Power Dissipation (Watts)
13
11
9
VIN = 36V VIN = 30V VIN = 24V VIN = 18V
88 86 84 82 80 0.7 1.4 2.1 2.8
VIN = 18V VIN = 24V VIN = 30V VIN = 36V
7
5
3
1
3.5 4.2 4.9 5.6 6.3 7
0.7
1.4
2.1
2.8
3.5
4.2
4.9
5.6
6.3
7
Load Current (Amps)
Load Current (Amps)
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MDC_UVQ Models.B11 Page 18 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-15/7-D48N: Maximum Current Temperature Derating (No baseplate, VIN = 48V, transverse air flow)
7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 20 25
7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 20 25 30 35
UVQ-15/7-D48N: Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow)
Output Current (Amps)
Output Current (Amps)
Natural convection 100 lfm 200 lfm 300 lfm 400 lfm
Natural convection 100 lfm 200 lfm 300 lfm
30
35
40
45
50
55
60
65
70
75
80
85
90
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature ( C)
Ambient Temperature ( C)
UVQ-15/7-D48N Efficiency vs. Line Voltage and Load Current @ +25C
UVQ-15/7-D48N Power Dissipation vs. Load Current @ +25C
94 92 90
Power Dissipation (Watts)
11 10 9 8 7 6 5 4 3 2 1 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7 0.7 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7
Load Current (Amps) Load Current (Amps)
88
Efficiency (%)
VIN = 75V VIN = 60V VIN = 48V VIN = 36V
86 84 82 80 78 76 0.7
VIN = 36V VIN = 48V VIN = 60V VIN = 75V
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MDC_UVQ Models.B11 Page 19 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-18/5.6-D24 Efficiency vs. Line Voltage and Load Current @ 25C 92 90 88 Efficiency (%) 86 84
VIN = 18V
82
VIN = 24V
80
VIN = 36V
78 76 0.56
1.12
1.68
2.24
2.8
3.36
3.92
4.48
5.04
5.6
Load Current (Amps)
UVQ-18/5.6-D24: Maximum Current Temperature Derating (No baseplate, VIN = 24V, transverse air flow)
5.8 5.6 5.4 5.8 5.6
UVQ-18/5.6-D24: Maximum Current Temperature Derating (With baseplate, VIN = 24V, transverse air flow)
Output Current (Amps)
5.2 5 4.8
Output Current (Amps)
200 lfm 300 lfm 100 lfm 400 lfm
5.4 5.2 5 4.8 4.6 4.4 4.2 4
4.6 4.4 4.2 4 3.8 3.6 3.4 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Natural Convection
100 lfm 200 lfm 300 lfm 400 lfm
Natural Convection
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
Ambient Temperature ( C)
UVQ-18/6-D48N Efficiency vs. Line Voltage and Load Current @ 25C 95 90 85
Efficiency (%)
UVQ-18/6-D48 Power Dissipation vs. Load Current @ 25C 16 14
VIN = 75V
Power Dissipation (Watts) 12
VIN = 48V
10
80 75 70 65 60 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6 Load Current (Amps)
VIN = 36V
8 6 4 2 0 0.6
VIN = 36V VIN = 48V VIN = 75V
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
6
Load Current (Amps)
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MDC_UVQ Models.B11 Page 20 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-18/6-D48: Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow)
6.5 6.5
UVQ-18/6-D48: Maximum Current Temperature Derating (No baseplate, VIN = 48V, transverse air flow)
6
6
Output Current (Amps)
5.5
Output Current (Amps)
5.5
5
100 lfm 200 lfm
5
100 lfm
4.5
4.5
300 lfm 500 lfm
200 lfm 300 lfm
4
4
500 lfm
3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85
3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature ( C)
Ambient Temperature ( C)
UVQ-24/4.5-D24N Efficiency vs. Line Voltage and Load Current @ +25C
91 90 89 88
Efficiency (%)
87 86 85 84
VIN = 30V VIN = 18V VIN = 24V
83 82 81 80 1.00 1.35 1.70 2.05 2.40 2.75 3.10 3.45 3.80 4.15 4.50
VIN = 36V
Load Current (Amps) UVQ-24/4.5-D48N Efficiency vs. Line Voltage and Load Current @ +25C
92 90 88 86 84
Efficiency (%)
Output Current (Amps)
UVQ-24/4.5-D48N: Maximum Current Temperature Derating (No baseplate, VIN = 48V, transverse air flow)
4.5
4.3
400 lfm 300 lfm 200 lfm 100 lfm
VIN = 36V VIN = 48V VIN = 60V VIN = 75V
4.0
82 80 78 76 74 72 70 68 66 64 1.00 1.35 1.70 2.05
3.8
3.5
3.3
3.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Ambient Temperature ( C)
2.40
2.75
3.10
3.45
3.80
4.15
4.50
Load Current (Amps)
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MDC_UVQ Models.B11 Page 21 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ-48/2.5-D48N Efficiency vs. Line Voltage and Load Current @ 25C 93 92 91
Efficiency (%)
2.6
UVQ-48/2.5-D48N: Maximum Current Temperature Derating (With baseplate, VIN = 48V, transverse air flow)
2.5
Output Current (Amps)
2.4
90
Natural convection
2.3
VIN = 36V
89
100 lfm
VIN = 48V
88
2.2
200 lfm
VIN = 60V
87
2.1
VIN = 75V
86 85 0.25
2.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature ( C)
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
Load Current (Amps)
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MDC_UVQ Models.B11 Page 22 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
UVQ Series Aluminum Heatsink The UVQ series converter baseplate can be attached either to an enclosure wall or a heatsink to remove heat from internal power dissipation. The discussion below concerns only the heatsink alternative. The UVQ's are available with a low-profile extruded aluminum heatsink kit, models HS-QB25-UVQ, HS-QB50UVQ, and HS-QB100-UVQ. This kit includes the heatsink, thermal mounting pad, screws and mounting hardware. See the assembly diagram below. Do not overtighten the screws in the tapped holes in the converter. This kit adds excellent thermal performance without sacrificing too much component height. See the Mechanical Outline Drawings for assembled dimensions. If the thermal pad is firmly attached, no thermal compound ("thermal grease") is required. Thermal Performance The HS-QB25-UVQ heatsink has a thermal resistance of 12 C/Watt of internal heat dissipation with "natural convection" airflow (no fans or other mechanical airflow) at sea level altitude. This thermal resistance assumes that the heatsink is firmly attached using the supplied thermal pad and that there is no nearby wall or enclosure surface to inhibit the airflow. The thermal pad adds a negligible series resistance of approximately 0.5C/Watt so that the total assembled resistance is 12.5C/Watt. Be aware that we need to handle only the internal heat dissipation, not the full power output of the converter. This internal heat dissipation is related to the efficiency as follows: Power Dissipation [Pd] = Power In - Power Out [1] Power Out / Power In = Efficiency [in %] / 100 [2] Power Dissipation [Pd] = Power In x (1 -Efficiency%/100) [3] Power Dissipation [Pd] = Power Out x (1 / (Efficiency%/100) - 1) [4] Efficiency of course varies with input voltage and the total output power. Please refer to the Performance Curves. Since many applications do include fans, here is an approximate equation to calculate the net thermal resistance: R4 [at airflow] = R4 [natural convection] / (1 + (Airflow in LFM) x [Airflow Constant]) [5] Where, R4 [at airflow] is the net thermal resistance (in C/W) with the amount of airflow available and, R4 [natural convection] is the still air total path thermal resistance or in this case 12.5C/Watt and, "Airflow in LFM" is the net air movement flow rate immediately at the converter. This equation simplifies an otherwise complex aerodynamic model but is a useful starting point. The "Airflow Constant" is dependent on the fan and enclosure geometry. For example, if 200 LFM of airflow reduces the effective natural convection thermal resistance by one half, the airflow constant would be 0.005. There is no practical way to publish a "one size fits all" airflow constant because of variations in airflow direction, heatsink orientation, adjacent walls, enclosure geometry, etc. Each application must be determined empirically and the equation is primarily a way to help understand the cooling arithmetic. This equation basically says that small amounts of forced airflow are quite effective removing the heat. But very high airflows give diminishing returns. Conversely, no forced airflow causes considerable heat buildup. At zero airflow, cooling occurs only because of natural convection over the heatsink. Natural convection is often well below 50 LFM, not much of a breeze. While these equations are useful as a conceptual aid, most users find it very difficult to measure actual airflow rates at the converter. Even if you know the velocity specifications of the fan, this does not usually relate directly to the enclosure geometry. Be sure to use a considerable safety margin doing thermal analysis. If in doubt, measure the actual heat sink temperature with a calibrated thermocouple, RTD or thermistor. Safe operation should keep the heat sink below 100C.
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Figure 7. Model UVQ Heatsink Assembly Diagram
When assembling these kits onto the converter, include ALL kit hardware to assure adequate mechanical capture and proper clearances. Thread relief is 0.090" (2.3mm).
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MDC_UVQ Models.B11 Page 23 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Calculating Maximum Power Dissipation To determine the maximum amount of internal power dissipation, find the ambient temperature inside the enclosure and the airflow (in Linear Feet per Minute - LFM) at the converter. Determine the expected heat dissipation using the Efficiency curves and the converter Input Voltage. You should also compensate for lower atmospheric pressure if your application altitude is considerably above sea level. The general proceedure is to compute the expected temperature rise of the heatsink. If the heatsink exceeds +100C. either increase the airflow and/or reduce the power output. Start with this equation: Internal Heat Dissipation [Pd in Watts] = (Ts - Ta)/R4 [at airflow] [6] where "Ta" is the enclosure ambient air temperature and, where "Ts" is the heatsink temperature and, where "R4 [at airflow]" is a specific heat transfer thermal resistance (in degrees Celsius per Watt) for a particular heat sink at a set airflow rate. We have already estimated R4 [at airflow] in the equations above. Note particularly that Ta is the air temperature inside the enclosure at the heatsink, not the outside air temperature. Most enclosures have higher internal temperatures, especially if the converter is "downwind" from other heat-producing circuits. Note also that this "Pd" term is only the internal heat dissipated inside the converter and not the total power output of the converter. We can rearrange this equation to give an estimated temperature rise of the heatsink as follows: Ts = (Pd x R4 [at airflow]) + Ta [7]
2.28 (57.91)
Heat Sink Example Assume an efficiency of 92% and power output of 100 Watts. Using equation [4], Pd is about 8.7 Watts at an input voltage of 48 Volts. Using +30C ambient temperature inside the enclosure, we wish to limit the heat sink temperature to +90C maximum baseplate temperature to stay well away from thermal shutdown. The +90C. figure also allows some margin in case the ambient climbs above +30C or the input voltage varies, giving us less than 92% efficiency. The heat sink and airflow combination must have the following characteristics: 8.7 W = (90-30) / R4[airflow] or, R4[airflow] = 60/8.7 = 6.9C/W Since the ambient thermal resistance of the heatsink and pad is 12.5C/W, we need additional forced cooling to get us down to 6.9C/W. Using a hypothetical airflow constant of 0.005, we can rearrange equation [5] as follows: (Required Airflow, LFM) x (Airflow Constant) = R4[Nat.Convection] / R4[at airflow] -1 or, (Required Airflow, LFM) x (Airflow Constant) = 12.5/6.9 -1 = 0.81 and, rearranging again, (Required Airflow, LFM) = 0.81/0.005 = 162 LFM 162 LFM is the minumum airflow to keep the heatsink below +90C. Increase the airflow to several hundred LFM to reduce the heatsink temperature further and improve life and reliability.
Heatsink Kit * Model Number HS-QB25-UVQ HS-QB50-UVQ HS-QB100-UVQ
Still Air (Natural convection) thermal resistance 12C/Watt 10.6C/Watt 8C/Watt
Heatsink height (see drawing) 0.25" (6.35mm) 0.50" (12.7mm) 1.00" (25.4mm)
1.860 (47.24)
* Kit includes heatsink, thermal pad and mounting hardware.
1.03 1.45 (26.16) (36.83)
0.140 DIA. (3.56) (4 PLACES)
*
MATERIAL: BLACK ANODIZED ALUMINUM
0.10 (2.54)
* UVQ SERIES HEATSINKS ARE AVAILABLE IN 3 HEIGHTS: 0.25 (6.35), 0.50 (12.70) AND 1.00 (25.4)
Dimensions in inches (mm)
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UVQ Models.B11 Page 24 of 25
UVQ Series
Low Profile, Isolated Quarter Brick 2.5-40 Amp DC/DC Converters
Case C59
2.30 (58.4) A
Case C59 with Baseplate
1.860 (47.2) A B B 0.42 (10.7)
PINS 1-3, 5-7: 0.040 0.001 (1.016 0.025) PINS 4 & 8: 0.060 0.001 (1.52 0.025)
0.188 (4.78)
1.030 (26.2)
1.45 (36.8)
2.00 (50.8)
A B B
#M3-THREAD X 0.15 DEEP TYPICAL (4) PLACES
0.600 (15.24) 4 EQ. SP. @ 0.150 (3.81)
BASEPLATE
1 2 3
4 5 6 7 8
1.45 (36.8)
0.50 (12.7)
BOTTOM VIEW
PINS 1-3, 5-7: 0.040 0.001 (1.016 0.025) PINS 4 & 8: 0.060 0.001 (1.52 0.025)
Alternate pin lengths are available. Contact Murata Power Solutions.
0.188 (4.8)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
2.30 (58.4)
A A
0.15 (3.81)
Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Components are shown for reference only.
I/O CONNECTIONS Pin 1 2 3 4 5 6 7 8 Function P32 -Input On/Off Control +Input -Output -Sense Output Trim +Sense +Output Important: If sense inputs are not connected to a remote load, connect them to their respective VOUT pins at the converter.
1 9 2 3
Optional pin 9 connects to baseplate. Electrically isolated from converter.
4 5 6 7 8
B
0.600 (15.24) 4 EQ. SP. @ 0.150 (3.81)
Optional baseplate pin is special order. Contact Murata Power Solutions..
2.00 (50.8)
BOTTOM VIEW
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
03/05/09
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) 2008 Murata Power Solutions, Inc.
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MDC_UVQ Models.B11 Page 25 of 25

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