UVQ-12/8-D24PL2-C [MURATA]
民用设备,工业设备;
muRata 
UVQ Series
s
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
ORDERING GUIDE SUMMARY
Model
VOUT Range
1.2V to 48V
IOUT Range
VIN Range
Efficiency
All Models
2.5A to 40A
18-36V or 36-75V
Up to 92.%, model dependent
INPUT CHARACTERISTICS
Parameter
Typ. @ 25°C, full load
Notes
Voltage Range
18-36 or 36-75 Volts
Up to 5.6 Amps
24V or 48V nominal
Model dependent
Current, full power
Isolation
2kVdc to 2250V
Model dependent
Typical unit
Remote On/Off Control
Switch or FET control
Positive or negative logic
OUTPUT CHARACTERISTICS
Parameter
FEATURES
Typ. @ 25°C, full load
1.5 to 48 Volts 10%
2.5 to 40 Amps fullscale
Down to 1% of VNOM
Notes
■
Standard quarter-brick package/pinout
Voltage
Trimmable
■
Outputs from 1.5 to 48V up to 125W
Current
No minimum load
Most models
■
Low profile 0.42" height
Accuracy
■
24 and 48Vdc nominal inputs
Ripple & Noise (to 20MHz)
Line and Load Regulation
Overcurrent Protection
Overtemperature Protection
Efficiency (minimum)
Down to 35mVp-p
Model dependent
Model dependent
With hiccup auto-restart
■
Fully isolated, 2250Vdc (BASIC) insulation
Down to 0.125%/ 0.25%
150% of IOUT max.
■
Designed for RoHS compliance
■
Output overvoltage/short-circuit protected
+125°C
■
On/Off control, trim and sense functions
See Performance Specifications
■
High efficiency to 92%
■
Protected against temp. and voltage limits
GENERAL SPECIFICATIONS
Parameter
■
Designed to meet UL/IEC/EN60950-1 safety
Typ. @ 25°C, full load
Down to 50μsec
Notes
approvals
Dynamic Load Response
Operating Temperature Range
Safety
Model dependent
–40 to +110°C
With baseplate, see derating curve
and CSA C22.2-No.234
UL/IEC/EN 60950-1
MECHANICAL CHARACTERISTICS
With baseplate
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)
Without baseplate
See Performance Specifications, page 2
PRODUCT OVERVIEW
For efficient, fully isolated DC power in the small-
est 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
+70°C 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 50ꢀsec). These converters
offer high stability even with no load and tight out-
put regulation. The unit is fully protected against
input over and undervoltage, output overcur-
rent 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 oper-
ates 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 certi-
fications 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
Lead-free
www.murata-ps.com/rohs
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
➀
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
R/N (mVp-p) ➁ Regulation (Max.) ➂
Input
VIN Nom. Range IIN, No Load IIN, Full Load
Package
(Case,
Efficiency)
VOUT
IOUT
Power
Root Models
(Volts) (Amps) (Watts) Typ. Max.
Line
Load
(Volts)
24
24
48
24
48
24
48
24
48
24
48
24
48
24
48
24
48
(Volts)
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
(mA)
(Amps)
2.84
4.14
2.37
4.58
2.7
Min.
86.5%
86%
Typ.
88%
Pinout)
UVQ-1.5/40-D24P-C 1.5
40
35
40
30
35
60
87.5
100
99
30
35
60
60
0.075%
0.05%
0.05%
0.1%
0.05%
0.05%
0.05%
0.25%
0.25%
0.05%
0.05%
0.1%
80
UVQ-2.5/35-D24P-C
2.5
100
100
180
130
180
80
88%
UVQ-2.5/40-D48N-C
60
87%
88%
UVQ-3.3/30-D24P-C
3.3
65
88.5%
87%
90%
UVQ-3.3/35-D48N-C
115.5
40
0.05%
0.05%
0.05%
0.1%
89%
UVQ-5/20-D24P-C
5
30
20
50
4.53
2.31
4.4
91%
92%
20
100
UVQ-5/20-D48N-C
25
88.5%
89%
90%
UVQ-12/8-D24P-C
12
8
96
95
130
160
150
150
185
185
100
130
200
375
90
91%
UVQ-12/10-D48N-C
10
120
110
85
0.075%
0.05%
0.05%
0.05%
0.05%
0.075%
0.075%
0.1%
0.05%
0.05%
0.02%
0.075%
0.075%
0.15%
0.25%
0.2%
60
2.78
4.85
2.39
4.69
2.5
88.5%
88.5%
90%
90%
C59, P32
UVQ-15/7-D24P-C
15
103
60
90.3%
91.5%
89.5%
90%
7
105
UVQ-15/7-D48N-C
120
125
125
60
UVQ-18/5.6-D24P-C
18
5.6
6
100.8
140
80
88%
UVQ-18/6-D48N-C
88.3%
88%
UVQ-24/4.5-D24P-C
24
108
120
45
5.03
2.49
4.4
89.5%
90.5%
91%
4.5
2.5
UVQ-24/4.5-D48N-C
75
45
89%
UVQ-48/2.5-D24P-C
48
100
250
45
89%
UVQ-48/2.5-D48N-C
0.175%
0.2%
30
2.71
91%
92.3%
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.
ꢀ
These are partial model numbers. Please refer to the full model number struc-
ture for complete ordering part numbers.
ꢁ
ꢂ
Min. IOUT = 3 Amps.
ꢃ
IOUT = 14 Amps max. with VIN = 18-19.5 Volts.
All specifications are at nominal line voltage and full load, +25°C unless other-
wise noted. See detailed specifications.
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 mechani-
cal drawings.
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
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.
UVQ-3.3/35-D48
UVQ-2.5/35-D24
UVQ-2.5/40-D48
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.
Other models which are not listed will be reviewed for future pin 9 accomo-
dation.
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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
Maximum Rated Output
Current in Amps
Blank = No baseplate, standard
B = Baseplate installed, optional special order
Input Voltage Range:
* Note:
Some model number combinations may not be
available. Contact Murata Power Solutions..
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Remote On/Off Control Polarity:
Add "P" for positive polarity
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.
+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
* Can be ordered with positive (standard) or negative (optional) polarity.
REMOTE
ON/OFF
CONTROL*
(2)
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 = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Input
Input voltage range
See ordering guide
17
Start-up threshold, (V) min.
17
17
17
17
17
16
17
17
16
17
16
Undervoltage
shutdown, (V)14
16
16.25
16.25
Overvoltage shutdown (V)
none
39
none
Reflected (back) ripple
current2
10-50 mA pk-pk, model dependent
Input Current
Full load conditions
Inrush transient, (A2sec)
Output short circuit, (mA)
No load, mA
See ordering guide.
0.5
40
80
0.5
0.05
50
0.5
0.1
10
90
1
1
0.05
50
0.05
50
320
103
50
100
180
160
140
45
30
Low line (VIN = min.),
(Amps)
3.79
5.49
6.04
5.57
5.93
6.52
6.29
6.67
3.60
Standby mode,
(Off, UV, OT shutdown)
1-4mA, model dependent
See notes.
Internal input filter type
L-C
Pi-type
L-C
Reverse polarity
protection
Remote On/Off Control5
Positive logic, "P" suffix
(specifications are max)
OFF = Ground pin to +0.8V
ON = Open or +5V to +VIN max.
Negative logic, "N" suffix
(specifications are max)
OFF = Open or +5V to +VIN max
ON = Ground pin to+0.8V max
Current
1-8 mA, model dependent
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MDC_UVQ Models.B11 Page 4 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Performance/Functional Specifications 24V Models
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Output
Voltage output range
See ordering guide.
1.25% of VNOM
–20 to +10% of VNOM.
Voltage output accuracy
(50% load)
1.5% of VNOM
1% of VNOM
Adjustment range
10% of VNOM.
Temperature coefficient
Minimum loading
0.02% of VOUT range per °C
No minimum load
3 amps
No minimum load
Remote sense
compensation
+10%.
Ripple/noise
See ordering guide.
See ordering guide.
See ordering guide.
Line/Load regulation
Efficiency
Maximum capacitive
loading, Low ESR
<0.02Ω max.,
10,000
5000
4700
2200
resistive load, (μF)
Current limit inception
(98% of VOUT, after
warmup), (Amps)
45
44
36
24
10
9.5
7
5.8
5
3.4
2.8
Short circuit protection
method
Current limiting, hiccup autorestart. Remove overload for recovery.
1.5 15 mA
Short circuit current,
(Amps)
3.6
3
3
3
3
Short circuit duration
Output may be shorted continuously to ground (no damage).
14.4 Volts
Overvoltage protection, (via
magnetic feedback)
2.3 Volts
3 Volts max 4 Volts max 6.8 Volts max
18.5 Volts 22 Volts max 29 Volts max 59 Volts max
max
Isolation Characteristics
Isolation Voltage
Input to Output, (Volts min)
Input to baseplate
2000
1500
Baseplate to output,
(Volts min)
1500
1000
1500
Isolation resistance
100 Mꢁ
1000
Isolation capacitance, (pF)
Isolation safety rating
1500
2000
50
Basic insulation
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MDC_UVQ Models.B11 Page 5 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Performance/Functional Specifications 24V Models
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Dynamic characteristics
100 ꢀSec to 150 ꢀSec to 150 ꢀSec to 100 ꢀSec to
1% 1.5% 1.5% 1.5% of final to 1%
of final value of final value of final value
50 ꢀSec
40 ꢀSec to 50 ꢀSec to 100 ꢀSec
1.25% 1% to 1%
100 ꢀSec
to 1%
Dynamic load response
(50-75-50% load step)
value
of final value of final value of final value of final value of final value
Start-up time
VIN to VOUT regulated, mSec
Remote On/Off to VOUT
regulated, mSec
90msec
90msec
50msec
50msec
200msec
40msec
30msec
30msec
290msec
100msec
50msec
50msec
600
200msec
360
30msec
25msec
242
35msec
200msec
290 30
100msec
250 25
Switching frequency, (KHz) 380 30
500 to 650
290 30
240 25
Environmental
Calculated MTBF4
TBD
Operating temperature
range: see Derating
Curves.
−40 to +85°C (with Derating, see Note 15.)
−40 to +115
Operating temperature,
with baseplate, no
derating required (°C)3
−40 to +110
−40 to +110
Storage temperature (°C)
−55 to +130
−55 to +125
Thermal protection/
shutdown
+110 to 125°C, model dependent
To +85°C/85%, non-condensing
Relative humidity
Physical
Outline dimensions
Baseplate material
Pin material
See mechanical specs.
Aluminum
Brass alloy
Pin diameter
0.04/0.062 inches (1.016/1.524 mm)
1.55 ounce
(44 grams)
Weight
1 ounce (28 grams)
Electromagnetic
interference
(conducted and
radiated)
Designed to meet FCC part 15, class B, EN55022
(external filter required)
Safety
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 Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Input
Input voltage range
See ordering guide
Start-up threshold, min (V)
35
34.5
34
34.5
35
Undervoltage
shutdown, (V)14
33.5
32
33.5
Overvoltage shutdown (V)
none
Reflected (back) ripple
current
10-50 mA pk-pk, model dependent
Input Current
Full load conditions
Inrush transient, (A2sec)
Output short circuit, (mA)
No load, mA
See ordering guide.
0.05
0.05
50
1
1
0.05
30
1
0.05
250
45
0.05
50
10
60
50
80
100
130
80
30
30
Low line (VIN = min.),
(Amps)
3.15
3.56
3.07
3.72
3.21
3.35
3.30
3.60
Standby mode,
(Off, UV, OT shutdown)
1-4mA, model dependent
See notes.
Internal input filter type
L-C
Pi-type
L-C
Reverse polarity
protection
Remote On/Off Control5
Positive logic, "P" suffix
(specifications are max)
OFF = Ground pin to +0.8V
ON = Open or +5V to +VIN max
Negative logic, "N" suffix
(specifications are max)
OFF = Open or +5V to +VIN max
ON = Ground pin to+0.8V max
Current
1-8 mA, model dependent
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MDC_UVQ Models.B11 Page 7 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Output
Voltage output range
See ordering guide.
1.25% of VNOM
Voltage output accuracy
(50% load)
1.5% of VNOM
1% of VNOM
Adjustment range
–20 to +10% of VNOM.
Temperature coefficient
0.02% of VOUT range per °C
No minimum
load
No minimum
load
Minimum loading
3 Amps
No minimum load
Remote sense
compensation
+10%.
Ripple/noise
See ordering guide.
See ordering guide.
See ordering guide.
Line/Load regulation
Efficiency
Maximum capacitive
loading, Low ESR
<0.02Ω max.,
10,000
48
4700
2200
1000
3.3
resistive load, (μF)
Current limit inception
(98% of VOUT, after
warmup), (Amps)
46
26
12.5
8.5
7
6.5
3
Short circuit protection
method
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
(Amps)
5
0.1
1.5
3
3
3.5
Short circuit duration
Output may be shorted continuously to ground (no damage).
Overvoltage protection, (via
magnetic feedback)
3 Volts max
4 Volts max
6 Volts max 14.4 Volts max 18.5 Volts max 22 Volts max 29 Volts max 55 Volts max
Isolation Characteristics
Isolation Voltage
Input to Output, (Volts min)
Input to baseplate
2250
1500
Baseplate to output,
(Volts min)
1500
1500
Isolation resistance
100 Mꢁ
Isolation capacitance, (pF)
Isolation safety rating
1500
1000
Basic insulation
50
50
1500
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MDC_UVQ Models.B11 Page 8 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Performance/Functional Specifications 48V Models
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection, external caps and full-load conditions, unless noted. (1)
Dynamic characteristics
150 ꢀSec to
1.5%
of final value of final value of final value
150 ꢀSec to
1.5%
90 ꢀSec
to 2%
100 ꢀSec
to 1%
of final value of final value
75 ꢀSec
to 1%
Dynamic load response
(50-75-50% load step)
50 ꢀSec to 1%50 ꢀSec to 1%50 ꢀSec to 1%
of final value of final value of final value
Start-up time
VIN to VOUT regulated, mSec
Remote On/Off to VOUT
regulated, mSec
50msec
50msec
50msec
40msec
30msec
30msec
100msec
50msec
50msec
600
50msec
600
50msec
30msec
30msec
30msec
100msec
290 30
50msec
Switching frequency, (KHz)
450 50
290 30
245 20
240 25
540 40
Environmental
Calculated MTBF4
TBD
−40 to +85°C (with Derating, see Note 15.)
Operating temperature
range: see Derating
Curves.
Operating temperature,
with baseplate, no
−40 to +110
−40 to +115 −40 to +110 −40 to +110 −40 to +120
−55 to +125
derating required (°C)3
Storage temperature (°C)
Thermal protection/
shutdown
+110 to 125°C, model dependent
To +85°C/85%, non-condensing
Relative humidity
Physical
Outline dimensions
Baseplate material
Pin material
Pin diameter
Weight
See mechanical specs.
Aluminum
Brass alloy
0.04/0.062 inches (1.016/1.524 mm)
1 ounce (28 grams)
Electromagnetic
interference
(conducted and
radiated)
Designed to meet FCC part 15, class B, EN55022
(external filter required)
Safety
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 Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
Input Voltage
Continuous
Transient (100 mS)
24V models
0 to +36V
+50V
48V models
0 to +75V
+100V
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.
On/Off Control
–0.3 V min to +13.5V max.
See Fuse section
Input Reverse Polarity Protection
Output Overvoltage
VOUT +20% max.
Output Current (Note 7)
Current-limited. Devices can withstand
sustained short circuit without damage.
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.
Storage Temperature
Lead Temperature
–55 to +125°C
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/Func-
tional Specifications Table is not implied nor recommended.
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.
(1) All models are tested and specified with 200 LFM airflow, external 1||10ꢀF 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 +25°C, VIN =nominal, VOUT = nominal, full load.
TO
CURRENT
PROBE
OSCILLOSCOPE
(2) Input Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filter-
ing is CIN = 33ꢀF tantalum, CBUS = 220ꢀF electrolytic, LBUS = 12ꢀH.
(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 = +25°C, 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.
3
1
+INPUT
–INPUT
L
BUS
+
VIN
C
BUS
CIN
–
C
C
IN = 33μF, ESR < 700mΩ @ 100kHz
BUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
(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) 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.
External input capacitors (CIN in Figure 2) serve primarily as energy-storage
elements. They should be selected for bulk capacitance (at appropriate fre-
quencies), 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 configura-
tion may necessitate additional considerations.
(12) Do not exceed maximum power specifications when adjusting the output trim.
(13) Note that the converter may operate up to +110°C with the baseplate installed.
However, thermal self-protection occurs near +110°C, and there is a temperature
gradient between the hotspot and the baseplate. Therefore, +100°C is recom-
mended 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
+128°C.
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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 filter-
ing 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 imped-
ances between the power supply and its load. Scope measurements should be
made using BNC connectors or the probe ground should be less than ½ inch
and soldered directly to the fixture.
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. Positive-
polarity 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 iso-
lated if appropriate). The drive circuit should be able to sink appropriate current
(see Performance Specifications) when activated and withstand appropriate
voltage when deactivated.
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.
%15)6!,%.4 #)2#5)4 &/2
0/3)4)6% !.$ .%'!4)6%
,/')# -/$%,3
ꢃꢄ6
ꢃ).054
ꢂ
ꢀ
/.ꢅ/&&
#/.42/,
#/.42/,
7
COPPER STRIP
+SENSE
8
2%&
+OUTPUT
ꢁ
n).054
#/--/.
R
LOAD
SCOPE
C1
C2
Figure 4. Driving the Remote On/Off Control Pin
4
5
–OUTPUT
–SENSE
COPPER STRIP
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.”
C1 = 1μF CERAMIC
C2 = 10μF 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.
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.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the point at which a
ramping input voltage crosses the Start-Up Threshold voltage and the point at
which the fully loaded output voltage enters and remains within its specified
ꢀ1% accuracy band. Actual measured times will vary with input source imped-
ance, 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.
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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 inter-
nal 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.
8
1
2
+OUTPUT
–INPUT
7
+SENSE
6
ON/OFF
CONTROL
Output Overvoltage Protection
TRIM
–SENSE
LOAD
RTRIM DOWN
The output voltage is monitored for an overvoltage condition via magnetic cou-
pling 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 volt-
age 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.
5
4
3
+INPUT
–OUTPUT
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.
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.
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).
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.
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:
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.
(VOUT at pins) x (IOUT) ꢁ rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be suscep-
tible 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 atmo-
spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your
production environment may differ; therefore please thoroughly review these guidelines
8
1
+OUTPUT
–INPUT
7
+SENSE
with your process engineers.
2
3
6
5
4
ON/OFF
CONTROL
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
TRIM
–SENSE
LOAD
RTRIM UP
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
+INPUT
–OUTPUT
7 seconds
Figure 5.Trim Connections To Increase Output Voltages Using Fixed Resistors
105° C.
250° C.
6 seconds
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MDC_UVQ Models.B11 Page 12 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Trim Equations
F E A T U R E S A N D O P T I O N S
Trim Up
Trim Down
Remote Sense
UVQ-1.5/40-D24
Note: The Sense and VOUT lines are internally connected through low-
value resistors. Nevertheless, if the sense function is not used for remote
regulation the user must connect the +Sense to +VOUT and -Sense to –VOUT
at the DC/DC converter pins.
6.23(VO – 1.226)
VO – 1.5
7.64
–10.2
–10.2
–10.2
–10.2
–10.2
–10.2
RTUP (kꢂ) =
RTUP (kꢂ) =
RTUP (kꢂ) =
RTDOWN (kꢂ) =
1.5 – VO
UVQ-2.5/40-D48, UVQ-2.5/35-D24
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.
10(VO – 1.226)
12.26
–10.2
RTDOWN (kꢂ) =
VO – 2.5
2.5 – VO
UVQ-3.3/35-D48
13.3(VO – 1.226)
VO – 3.3
16.31
–10.2
RTDOWN (kꢂ) =
3.3 – VO
UVQ-5/25-D24, UVQ-5/20-D48
25.01
20.4(VO – 1.226)
–10.2
RTDOWN (kꢂ) =
RTUP (kꢂ) =
RTUP (kꢂ) =
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:
5 – VO
VO – 5
UVQ-12/8-D24, -12/10-D48
[VOUT(+) –VOUT(–)] – [Sense(+) –Sense (–)] ≤ 10% VOUT
Contact and PCB resistance
losses due to IR drops
49.6(VO – 1.226)
VO – 12
60.45
–10.2
RTDOWN (kꢂ) =
12 – VO
8
1
+OUTPUT
–INPUT
IOUT
UVQ-15/7-D24, -D48
7
+SENSE
Sense Current
76.56
62.9(VO – 1.226)
2
3
ON/OFF
CONTROL
–10.2
–10.2
–10.2
RTDOWN (kꢂ) =
RTUP (kꢂ) =
RTUP (kꢂ) =
6
5
TRIM
–SENSE
LOAD
15 – VO
VO – 15
Sense Return
IOUT Return
UVQ-18/5.6-D24, -18/6-D48
4
+INPUT
92.9
75.5(VO – 1.226)
VO – 18
–OUTPUT
–10.2
RTDOWN (kꢂ) =
18 – VO
Contact and PCB resistance
losses due to IR drops
UVQ-24/4.5-D24, -D48
Figure 8. Remote Sense Circuit Configuration
124.2
101(VO – 1.226)
–10.2
–10.2
–10.2
RTDOWN (kꢂ) =
RTUP (kꢂ) =
RTUP (kꢂ) =
24 – VO
VO – 24
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 Specifica-
tions 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:
UVQ-48/2.5-D24, -D48
250
210.75(VO – 1.226)
VO – 48
–10.2
RTDOWN (kꢂ) =
48 – VO
Note: Higher output 24V and 48V converters require larger, low-tempco,
precision trim resistors. An alternative is a low-TC multi-turn potentiometer
(20kΩ typical) connected between +VOUT and –VOUT with the wiper to the Trim
pin.
(VOUT at pins) × (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)
UVQ-1.5/40-D24N: Maximum Current Temperature Derating
(With baseplate, VIN = 24V, transverse air flow)
40
39
38
37
36
35
34
33
40
39
38
37
36
35
34
33
Natural convection
100 lfm
Natural convection
200 lfm
200 lfm
400 lfm
100 lfm
400 lfm
20
25
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 (oC)
Ambient Temperature (oC)
UVQ-2.5/40-D48
Power Dissipation vs. Load Current @ 25°C
UVQ-2.5/40-D48N
Efficiency vs. Line Voltage and Load Current @ 25°C
16
92
88
84
80
76
72
68
64
62
14
12
10
8
V
IN = 48V
V
IN = 36V
6
V
IN = 48V
4
V
IN = 75V
2
0
0
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
Load Current (Amps)
UVQ-3.3/30-D24N: Maximum Current Temperature Derating
UVQ-3.3/30-D24N: Maximum Current Temperature Derating
(No baseplate, VIN = 24V, transverse air flow at sea level)
(With baseplate, VIN = 24V, transverse air flow at sea level)
30
29
28
27
26
25
24
23
22
21
20
19
18
17
30
29
28
27
26
25
24
23
22
21
Natural convection
Natural convection
100 lfm
200 lfm
300 lfm
100 lfm
200 lfm
300 lfm
400 lfm
400 lfm
20
25
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 (oC)
Ambient Temperature (oC)
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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
32
30
28
26
24
22
20
18
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 (oC)
UVQ-5/20-D24P: Maximum Current Temperature Derating
UVQ-5/20-D24PB: Maximum Current Temperature Derating
(No baseplate, VIN = 24V, transverse air flow)
(With baseplate, VIN = 24V, transverse air flow)
20
19.5
19
20
19.5
19
18.5
18
18.5
18
Natural convection
100 lfm
17.5
17
200 lfm
300 lfm
400 lfm
17.5
17
Natural convection
100 lfm
16.5
16
200 lfm
300 lfm
400 lfm
15.5
15
16.5
16
14.5
14
15.5
20
25
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 (oC)
Ambient Temperature (oC)
UVQ-5/20-D24P
Efficiency vs. Line Voltage and Load Current @ +25°C
UVQ-5/20-D24
Power Dissipation vs. Load Current @ +25°C
94
93
92
91
90
89
88
87
86
85
84
10
9
8
7
6
5
4
3
2
1
VIN = 18V
VIN = 24V
VIN = 30V
VIN = 36V
V
IN = 18V
V
IN = 24V
IN = 30V
V
V
IN = 36V
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)
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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 @ 25°C
UVQ-5/20-D48P: Maximum Current Temperature Derating
(No baseplate, VIN = 48V, transverse air flow at sea level)
92
88
84
80
76
72
68
64
62
21
20
19
18
17
16
15
14
13
12
100 lfm
200 lfm
300 lfm
V
IN = 36V
V
IN = 48V
400 lfm
Natural convection
V
IN = 75V
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (oC)
0
2
4
6
8
10
12
14
16
18
20
Load Current (Amps)
UVQ-5/20-D48PB: Maximum Current Temperature Derating
(With baseplate, VIN = 48V, transverse air flow at sea level)
21
20
19
18
17
16
15
14
13
100 lfm
200 lfm
300 lfm
400 lfm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (oC)
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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 @ +25°C
UVQ-12/8-D24P: Maximum Current Temperature Derating
(No baseplate, VIN = 24V, transverse air flow)
95
90
85
80
75
8.0
7.8
7.6
7.4
7.2
7.0
6.8
VIN = 18V
VIN = 24V
VIN = 30V
VIN = 36V
100 lfm
200 lfm
300 lfm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (oC)
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
UVQ-12/10-D48N: Maximum Current Temperature Derating
(No baseplate, VIN = 48V, transverse air flow)
(With baseplate, VIN = 48V, transverse air flow)
10
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
9
8
7
6
5
Natural convection
100 lfm
Natural convection
100 lfm
200 lfm
300 lfm
400 lfm
200 lfm
300 lfm
400 lfm
20
25
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 (oC)
Ambient Temperature (oC)
UVQ-12/10-D48N
Efficiency vs. Line Voltage and Load Current @ +25°C
UVQ-12/10-D48N
Power Dissipation vs. Load Current @ +25°C
15
92
90
88
86
84
82
80
78
13
11
9
V
V
V
V
IN = 36V
IN = 48V
IN = 60V
IN = 75V
V
IN = 75V
V
IN = 60V
IN = 48V
V
7
V
IN = 36V
5
3
1
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
UVQ-15/7-D24N: Maximum Current Temperature Derating
(No baseplate, VIN = 24V, transverse air flow)
(With baseplate, VIN = 24V, transverse air flow)
7.5
7
7.5
7
6.5
6
6.5
6
Natural convection
100 lfm
5.5
5
5.5
5
200 lfm
300 lfm
400 lfm
Natural convection
100 lfm
200 lfm
300 lfm
400 lfm
4.5
4
4.5
4
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (oC)
Ambient Temperature (oC)
UVQ-15/7-D24N
Efficiency vs. Line Voltage and Load Current @ +25°C
UVQ-15/7-D24N
Power Dissipation vs. Load Current @ +25°C
94
92
90
88
86
84
82
80
13
11
9
V
IN = 36V
VIN = 18V
VIN = 24V
VIN = 30V
VIN = 36V
V
IN = 30V
IN = 24V
7
V
V
IN = 18V
5
3
1
0.7
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)
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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
UVQ-15/7-D48N: Maximum Current Temperature Derating
(No baseplate, VIN = 48V, transverse air flow)
(With 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
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
Natural convection
100 lfm
200 lfm
300 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
90
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (oC)
Ambient Temperature (oC)
UVQ-15/7-D48N
Efficiency vs. Line Voltage and Load Current @ +25°C
UVQ-15/7-D48N
Power Dissipation vs. Load Current @ +25°C
11
94
92
90
88
86
84
82
80
78
76
10
9
8
7
6
5
4
3
2
1
VIN = 75V
V
IN = 60V
IN = 48V
V
V
V
V
IN = 36V
IN = 48V
IN = 60V
IN = 75V
V
V
IN = 36V
0.7
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)
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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 @ 25°C
92
90
88
86
84
82
80
78
76
V
IN = 18V
V
IN = 24V
V
IN = 36V
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)
UVQ-18/5.6-D24: Maximum Current Temperature Derating
(With baseplate, VIN = 24V, transverse air flow)
5.8
5.6
5.4
5.2
5
5.8
5.6
5.4
5.2
5
200 lfm
300 lfm
4.8
4.6
4.4
4.2
4
100 lfm
400 lfm
Natural
Convection
100 lfm
4.8
4.6
4.4
4.2
4
200 lfm
300 lfm
Natural
Convection
400 lfm
3.8
3.6
3.4
20
25
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 (oC)
Ambient Temperature (oC)
UVQ-18/6-D48
Power Dissipation vs. Load Current @ 25°C
UVQ-18/6-D48N
Efficiency vs. Line Voltage and Load Current @ 25°C
16
95
90
85
80
75
70
65
60
14
12
10
8
VIN = 75V
V
IN = 48V
V
IN = 36V
V
IN = 36V
6
V
IN = 48V
4
V
IN = 75V
2
0
0.6
0.6
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
6
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
6
Load Current (Amps)
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)
UVQ-18/6-D48: Maximum Current Temperature Derating
(No baseplate, VIN = 48V, transverse air flow)
6.5
6
6.5
6
5.5
5
5.5
5
100 lfm
100 lfm
200 lfm
300 lfm
500 lfm
4.5
4
4.5
4
200 lfm
300 lfm
500 lfm
3.5
3.5
20
25
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 (oC)
Ambient Temperature (oC)
UVQ-24/4.5-D24N
Efficiency vs. Line Voltage and Load Current @ +25°C
91
90
89
88
87
86
85
84
83
82
81
80
VIN = 18V
VIN = 24V
VIN = 30V
VIN = 36V
1.00 1.35 1.70 2.05 2.40 2.75 3.10 3.45 3.80 4.15 4.50
Load Current (Amps)
UVQ-24/4.5-D48N
Efficiency vs. Line Voltage and Load Current @ +25°C
UVQ-24/4.5-D48N: Maximum Current Temperature Derating
(No baseplate, VIN = 48V, transverse air flow)
92
4.5
90
88
86
84
82
80
78
76
74
72
70
68
66
64
4.3
4.0
3.8
3.5
3.3
3.0
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 75V
400 lfm
300 lfm
200 lfm
100 lfm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (oC)
1.00 1.35 1.70 2.05 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 @ 25°C
UVQ-48/2.5-D48N: Maximum Current Temperature Derating
(With baseplate, VIN = 48V, transverse air flow)
2.6
2.5
2.4
2.3
2.2
2.1
2.0
93
92
91
90
89
88
87
86
85
Natural convection
100 lfm
V
IN = 36V
V
IN = 48V
200 lfm
V
IN = 60V
V
IN = 75V
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (oC)
0.25
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
Thermal Performance
UVQ Series Aluminum Heatsink
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 negli-
gible series resistance of approximately 0.5°C/Watt so that the total assembled
resistance is 12.5°C/Watt.
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-QB50-
UVQ, 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 excel-
lent 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.
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]
0!. (%!$ 3#2%7
-ꢂ 8 ꢆ--
ꢇ 0,#3
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.
,/#+ 7!3(%2
-ꢂ
ꢇ 0,#3
Since many applications do include fans, here is an approximate equation to
calculate the net thermal resistance:
Rꢃ [at airflow] = Rꢃ [natural convection] / (1 + (Airflow in LFM) x
[Airflow Constant]) [5]
&,!4 7!3(%2
./ꢈ ꢇ
ꢇ 0,#3
Where,
Rꢃ [at airflow] is the net thermal resistance (in °C/W) with the amount of
airflow available and,
Rꢃ [natural convection] is the still air total path thermal resistance or in this
case 12.5°C/Watt and,
(%!43).+
“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 enclo-
sure 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.
(%!4 42!.3&%2 0!$
ꢉ0EEL OFF WHITE PLASTIC
BACKING MATERIAL BEFORE
ATTACHING TO HEATSINKꢊ
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.
Figure 7. Model UVQ Heatsink Assembly Diagram
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 100°C.
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
Heat Sink Example
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 compen-
sate for lower atmospheric pressure if your application altitude is considerably
above sea level.
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 +30°C ambient
temperature inside the enclosure, we wish to limit the heat sink temperature to
+90°C maximum baseplate temperature to stay well away from thermal shut-
down. The +90°C. figure also allows some margin in case the ambient climbs
above +30°C or the input voltage varies, giving us less than 92% efficiency.
The heat sink and airflow combination must have the following characteristics:
The general proceedure is to compute the expected temperature rise of the
heatsink. If the heatsink exceeds +100°C. either increase the airflow and/or
reduce the power output. Start with this equation:
8.7 W = (90-30) / Rꢃ[airflow] or,
Rꢃ[airflow] = 60/8.7 = 6.9°C/W
Internal Heat Dissipation [Pd in Watts] = (Ts – Ta)/Rꢃ [at airflow] [6]
where “Ta” is the enclosure ambient air temperature and,
where “Ts” is the heatsink temperature and,
Since the ambient thermal resistance of the heatsink and pad is 12.5°C/W,
we need additional forced cooling to get us down to 6.9°C/W. Using a hypo-
thetical airflow constant of 0.005, we can rearrange equation [5] as follows:
(Required Airflow, LFM) x (Airflow Constant) = Rꢃ[Nat.Convection] /
Rꢃ[at airflow] –1
where “Rꢃ [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 Rꢃ [at airflow] in the equations above.
or, (Required Airflow, LFM) x (Airflow Constant) = 12.5/6.9 –1 = 0.81 and,
rearranging again,
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-pro-
ducing 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.
(Required Airflow, LFM) = 0.81/0.005 = 162 LFM
162 LFM is the minumum airflow to keep the heatsink below +90°C.
Increase the airflow to several hundred LFM to reduce the heatsink tempera-
ture further and improve life and reliability.
We can rearrange this equation to give an estimated temperature rise of the
heatsink as follows:
Ts = (Pd x Rꢃ [at airflow]) + Ta [7]
2.28
(57.91)
Heatsink Kit *
Model Number
Still Air (Natural convection)
thermal resistance
Heatsink height
(see drawing)
1.860
(47.24)
HS-QB25-UVQ
HS-QB50-UVQ
HS-QB100-UVQ
12°C/Watt
10.6°C/Watt
8°C/Watt
0.25" (6.35mm)
0.50" (12.7mm)
1.00" (25.4mm)
* 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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MDC_UVQ Models.B11 Page 24 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Case C59
Case C59 with Baseplate
2.30 (58.4)
1.860 (47.2)
A
A
0.42
(10.7)
1.030
1.45
(26.2) (36.8)
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)
2.00 (50.8)
A
BASEPLATE
#M3-THREAD X 0.15 DEEP
TYPICAL (4) PLACES
1
2
3
4
5
6
7
8
0.600
(15.24)
4 EQ. SP.
@ 0.150
(3.81)
1.45
(36.8)
0.50
(12.7)
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
(4.8)
BOTTOM VIEW
Alternate pin lengths are available. Contact Murata Power Solutions.
Dimensions are in inches (mm shown for ref. only).
2.30 (58.4)
2.00 (50.8)
A
A
Third Angle Projection
Optional baseplate pin
is special order.
Contact Murata Power Solutions..
0.15 (3.81)
1
9
4
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 2ꢂ
5
0.600 (15.24)
4 EQ. SP.
@ 0.150 (3.81)
Optional pin 9 connects
to baseplate. Electrically
isolated from converter.
6
2
3
7
8
Components are shown for reference only.
I/O CONNECTIONS
Pin
1
Function P32
–Input
BOTTOM VIEW
Important: If sense inputs
are not connected to a
remote load, connect them
to their respective VOUT pins
at the converter.
2
On/Off Control
+Input
3
4
–Output
5
–Sense
6
Output Trim
+Sense
7
8
+Output
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Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Canada:
UK:
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München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
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
France:
Germany:
Japan:
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
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
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
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MDC_UVQ Models.B11 Page 25 of 25
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