UWQ-12/20-T48 Series
www.murata-ps.com
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PRODUCT OVERVIEW
Typical unit
FEATURES
Fixed DC outputs, 12V @ 20A
Industry standard quarter brick 2.3” x 1.45” x
0.46” open frame package
Wide range 18 to 60 Vdc input voltages with 2250
Volt Basic isolation
Remote ON/Off enable control
DOSA-compatible pinouts and form factor
High efficiency synchronous rectifier topology
The UWQ series offers high output current (up to
20 Amps) in an industry standard “quarter brick”
package requiring no heat sink for most applications.
The UWQ series delivers fixed DC output voltages up
to 240 Watts (12V @ 20A) for printed circuit board
mounting. Wide range inputs of 18 to 60 Volts DC
(48 Volts nominal) are ideal for datacom and telecom
systems.
The UWQ-12/20-T48xS offers a load sharing
option for paralleling up to three modules in the
most demanding, power hungry applications. The
UWQ-12/20-T48xT is trimmable from 10.8Vout to
13.2Vout and includes Sense pins to compensate for
voltage drops at the load.
Advanced automated surface mount assembly and
planar magnetics deliver galvanic isolation rated at
2250 Vdc for basic insulation. To power digital systems, the outputs offer fast settling to current steps
and tolerance of higher capacitive loads. Excellent
ripple and noise specifications assure compatibility
to CPUs, ASICs, programmable logic and FPGAs.
No minimum load is required. For systems needing
controlled startup/shutdown, an external remote On/
Off control may use either positive or negative logic.
A wealth of self-protection features include input
undervoltage lockout and overtemperature shutdown
using an on-board temperature sensor; overcurrent
protection using the “hiccup” autorestart technique,
provides indefinite short-circuit protection, along with
output OVP. The synchronous rectifier topology offers
high efficiency for minimal heat generation and “no
heat sink” operation. The UWQ series is certified to
safety standards UL/IEC/CSA 60950-1, 2nd edition. It
meets class B EMI conducted emission compliance to
EN55022, CISPR22 with an external filter.
Multiple-unit parallel operation for increased
current
Stable no-load operation
Monotonic startup into pre-bias output condition
Certified to UL/60950-1, CSA-C22.2 No. 609501, 2nd edition safety approvals
Extensive self-protection, OVP, input undervoltage,
current limiting and thermal shutdown
Trimmable output from 10.8V to 13.2V
+Vin (1)
F1
External
DC
Power
Source
On/Off
Control
(2)
APPLICATIONS
Embedded systems, datacom and telecom installations, wireless base stations
Disk farms, data centers and cellular repeater sites
Remote sensor systems, dedicated controllers
Instrumentation systems, R&D platforms, automated test fixtures
Data concentrators, voice forwarding and
speech processing systems
+Vout (8)
Barrier
Controller
and Power
Reference and
Error Amplifier
-Vin (3)
Trim (6)
-Vout (4)
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 1 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Output
Root Model ➀
Input
Iout
Iin full
R/N (mV pk-pk) Regulation (Max.) ➁
Vout (Amps, Power
Vin Nom. Range
Iin no
load
(Volts) max.) (Watts) Typ. Max.
Line
Load
(Volts) (Volts) load (mA) (Amps)
Efficiency
Min.
Typ.
Dimensions (open frame)
(inches)
(mm)
UWQ-12/20-T48
12
20
240
100
120
±1.0
±1.5
48
18-60
90
5.43
90%
92%
2.30x1.45x0.46 max. 58.4x36.8x11.7
UWQ-12/20-T48xS
12
20
240
100
120
±1.25
±2.5
48
18-60
90
5.43
90%
92%
2.30x1.45x0.46 max. 58.4x36.8x11.7
UWQ-12/20-T48xT
12
20
240
100
120
±0.25
±0.3
48
18-60
80
5.43
90%
92%
2.30x1.45x0.46 max. 58.4x36.8x11.7
➀ Please refer to the part number structure for additional ordering information and options.
➁ All specifications are typical at nominal line voltage and full load, +25°C unless otherwise noted. See
detailed specifications. Output capacitors are 1 µF || 10 µF with a 22µF input capacitor. These caps are
necessary for our test equipment and may not be needed for your application.
* To Be Discontinued
* NOTE: the following models are
UWQ-12/20-T48NBS-C
UWQ-12/20-T48N-C
UWQ-12/20-T48NS-C
UWQ-12/20-T48NTB-C
TO BE DISCONTINUED:
UWQ-12/20-T48NT-C
UWQ-12/20-T48PB-C
UWQ-12/20-T48PBS-C
UWQ-12/20-T48P-C
UWQ-12/20-T48PS-C
UWQ-12/20-T48PTB-C
UWQ-12/20-T48PT-C
UWQ-12/20-T48NB-C
PART NUMBER STRUCTURE
UWQ - 12 / 20 - T48 N T B S Lx - C
RoHS Hazardous Materials compliance
C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Family
Series:
Wide Input
Quarter Brick
Pin length option
Blank = Standard pin length 0.180 in. (4.6 mm)
L1 = 0.110 in. (2.79 mm) ➀
L2 = 0.145 in. (3.68 mm) ➀
Nominal Output Voltage
Load Share Option
Blank = No share
S = Load share
Maximum Rated Output:
Current in Amps
Input Voltage Range:
T48 = 18-60 Volts (48V nominal)
On/Off Control Logic
N = Negative logic
P = Positive logic
Baseplate (optional)
Blank = No baseplate, standard
B = Baseplate installed, optional
Trim & Sense Option
Blank = No trim and sense
T = Trim and sense
➀ Special quantity order is required; samples available with standard pin length only.
➁ Some model number combinations may not be available. See website or contact your local Murata sales representative.
UWQ-12/20-T48NBL1-C
Complete Model Number Example:
Negative On/Off logic, baseplate installed, 0.110˝ pin length, RoHS-6 compliance
www.murata-ps.com/support
* Last time buy date is 3/31/2021. Please click here to view product discontinuance notice
MDC_UWQ-12/20-T48 Series.A04 Page 2 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, UWQ-12/20-T48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Input Voltage, Continuous
Full power operation
Operating or non-operating,
100 mS max. duration
Input to output
Power on or off, referred to -Vin
Input Voltage, Transient
Isolation Voltage
On/Off Remote Control
Output Power
Minimum
18
Typical/Nominal
48
0
0
Maximum
Units
70
Vdc
75
Vdc
2250
13.5
247.2
Vdc
Vdc
W
Current-limited, no damage,
0
20
A
short-circuit protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in
the Performance/Functional Specifications Table is not implied or recommended.
Output Current
INPUT
Conditions ➀ ➂
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load input current (T48xT models)
No Load input current (all other models)
Shut down mode input current
Reflected (back) ripple current ➁
Pre-biased startup
18
Fast blow
Rising input voltage
Falling input voltage
16
14.75
Vin = nominal
Vin = minimum
Vin = 48V.
48
20
16.75
15.5
L-C
5.43
14.65
0.05
50
80
90
5
15
Monotonic
Iout = minimum, unit = ON
Iout = minimum, unit = ON
Measured at input with specified filter
External output voltage < Vset
60
17.5
16.75
Vdc
A
Vdc
Vdc
5.72
15.34
0.1
100
150
150
8
25
A
A
A2-Sec.
mA
mA
mA
mA
mA, RMS
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage, input to output
Isolation Voltage, input to baseplate
Isolation Voltage, output to baseplate
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (certified to the following
requirements)
Calculated MTBF
Vin=48V, full load
Vin=min
90
89.5
With or without baseplate
With baseplate
With baseplate
2250
1500
1500
92
91
%
%
Vdc
Vdc
Vdc
basic
100
1500
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/60950-1, 2nd edition
Per Telcordia SR-332, issue 1, class 3, ground
fixed, Tambient = +25°C
MΩ
pF
Yes
TBD
Hours x 103
DYNAMIC CHARACTERISTICS (T48xT models)
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
250
275
60
60
220
±500
300
65
65
275
±700
KHz
mS
mS
µSec
mV
180
200
10
10
200
±1100
220
20
20
250
±1300
KHz
mS
mS
µSec
mV
1
1
13.5
2
Vdc
Vdc
mA
13.5
1
2
V
V
mA
Power On, to Vout regulation band
Remote ON to Vout Regulated
50-75-50% load step to 3% error band
same as above
DYNAMIC CHARACTERISTICS (all other models)
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
Power On, to Vout regulation band
Remote ON to Vout Regulated
50-75-50% load step to 3% error band
same as above
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Base Plate
ON = pin grounded or external voltage
OFF = pin open or external voltage
open collector/drain
0
3.5
ON = pin open or external voltage
OFF = ground pin or external voltage
open collector/drain
"B" suffix
3.5
0
1
optional
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MDC_UWQ-12/20-T48 Series.A04 Page 3 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, UWQ-12/20-T48, (CONT.)
OUTPUT
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation (standard 12/20-T48) ➄
Line Regulation
Load Regulation
Regulation (T48xS models) ➄
Line Regulation
Load Regulation
Regulation (T48xT models) ➄
Line Regulation
Load Regulation
Ripple and Noise ➅
Temperature Coefficient
Maximum Capacitive Loading
Current Share Accuracy (2 units in parallel)
(T48xS models)
Remote Sense Compliance (T48xT models)
Minimum
Conditions ➀
Total Output Power
Voltage
Setting Accuracy, fixed output
Output Voltage Range (T48xT models)
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Typical/Nominal
Maximum
Units
0.0
240
247.2
W
11.64
-10
12
12.36
+10
15
Vdc
% of Vnom.
Vdc
0
20
No minimum load
25.5
20
A
27.5
A
1
2
A
Vin=min. to max., Vout=nom., full load
Iout=min. to max., Vin=nom.
±1
±1.5
% of Vout
% of Vout
Vin=min. to max., Vout=nom., full load
Iout=min. to max., Vin=nom.
±1.25
±2.5
% of Vout
% of Vout
Vin=min. to max., Vout=nom., full load
Iout=min. to max., Vin=nom.
5 Hz- 20 MHz BW, Cout=1µF MLCC paralleled with
10µF tantalum
At all outputs
Low ESR
±0.25
±0.3
% of Vout
% of Vout
120
mV pk-pk
At 50% load, not user adjustable
User-adjustable
Via magnetic feedback
96% of Vnom., cold condition
23.5
Hiccup technique, autorecovery within 1.25% of
Vout
Output shorted to ground, no damage
Continuous
Hiccup current limiting
Non-latching
100
0.02
5000
% of Vout./°C
μF
Percent deviation from ideal sharing (50%)
±10
%
Sense connected at load
10
% of Vout
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate)
(Please refer to outline drawing)
Outline Dimensions (with baseplate)
Weight
2.3x1.45x0.46 max.
58.4x36.8x11.68
2.3x1.45x0.5
58.4x36.8x12.7
1.6
45
2.24
63.5
0.04 & 0.06
1.016 & 1.52
Copper alloy
50
5
Aluminum
LxWxH
No baseplate
No baseplate
With baseplate
With baseplate
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Nickel subplate
Gold overplate
Baseplate Material
Inches
mm
Inches
mm
Ounces
Grams
Ounces
Grams
Inches
mm
µ-inches
µ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating
Notes
See derating curves
With baseplate, no derating
Vin = Zero (no power)
Measured at hotspot
External filter is required
➀ Unless otherwise noted, all specifications apply at Vin = nominal, nominal output voltage and full output
load. General conditions are near sea level altitude, no base plate installed and natural convection
airflow unless otherwise specified. All models are tested and specified with external parallel 1 μF and
10 μF multi-layer ceramic output capacitors and a 22µF external input capacitor (see Technical Notes).
All capacitors are low-ESR types wired close to the converter. These capacitors are necessary for our
test equipment and may not be needed in the user’s application.
➁ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is Cin
= 33 µF/100V, Cbus = 220µF/100V and Lbus = 12 µH.
-40
-40
-55
135
85
110
125
150
140
B
RoHS-6
°C
°C
°C
°C
Class
➂ All models are stable and regulate to specification under no load.
➃ The Remote On/Off Control is referred to -Vin.
➄ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme. The load step is ±25% of full load current.
➅ Output Ripple and Noise is measured with Cout = 1 µF || 10 µF, 20 MHz oscilloscope bandwidth and full
resistive load.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 4 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48-C
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
25
94
92
90
Efficiency (%)
Power Dissipation (Watts)
20
88
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
86
84
82
80
78
76
15
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
10
5
74
72
70
0
2
4
6
8
10
12
Load Current (Amps)
14
16
18
20
2
4
6
8
10
12
14
16
18
20
Output Load Curre nt (Amps)
Thermal image with hot spot at 10.8A with 25°C ambient temperature. Natural convection is used with no forced airflow.
Identifiable and recommended maximum value to be verified in application.
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MDC_UWQ-12/20-T48 Series.A04 Page 5 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48-C
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
21
21
18
18
15
15
12
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
9
6
3
0
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
12
3
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
50
Ambient Temperature (°C)
21
21
18
18
15
15
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
65
70
75
80
85
80
85
12
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
3
0
60
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
12
55
Ambient Temperature (°C)
3
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
50
Ambient Temperature (°C)
55
60
65
70
75
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
21
Output Current (Amps)
18
15
12
9
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
6
3
0
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UWQ-12/20-T48 Series.A04 Page 6 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48-C
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
19
19
17
17
15
15
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
13
11
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
7
5
30
35
40
13
11
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
7
45
50
55
60
65
70
75
80
5
85
30
35
40
45
50
Ambient Temperature (°C)
19
19
17
17
15
15
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
11
9
65
70
75
80
85
80
85
13
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
11
9
7
5
60
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
13
55
Ambient Temperature (°C)
7
30
35
40
45
50
55
60
65
70
75
80
5
85
30
35
40
45
50
Ambient Temperature (°C)
55
60
65
70
75
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
19
Output Current (Amps)
17
15
13
11
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
7
5
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UWQ-12/20-T48 Series.A04 Page 7 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48-C
Start-up Delay (Vin = 48V, Iout = 0A, Cload = 0, Ta = +25°C) Ch1 = Vin, Ch2 = Vout
Start-up Delay (Vin = 48V, Iout = 20A, Cload = 5000µF, Ta = +25°C) Ch1 = Vin, Ch2 = Vout
On/Off Enable Delay (Vin = 48V, Vout = nom, Iout = 20A, Cload = 5000μF, Ta = +25°C) Ch1 =
Enable, Ch2 = Vout.
Stepload Transient Response (Vin = 48V, Iout = 50-75-50% of Imax,
Cload = 1μF || 10μF, Io = 10A/div, Ta = +25°C) Ch2 = Vout, Ch4 = Iout
Output ripple and Noise (Vin = 48V, Iout = 0A, Cload = 1μF || 10μF,
Ta = +25°C, BW = 20Mhz)
Output ripple and Noise (Vin = 48V, Iout = 20A, Cload = 1μF || 10μF,
Ta = +25°C, BW = 20Mhz)
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MDC_UWQ-12/20-T48 Series.A04 Page 8 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xS
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
25
94
92
90
20
Efficiency (%)
86
84
82
Power Dissipation (Watts)
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
88
80
78
76
15
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
10
5
74
72
70
0
2
4
6
8
10
12
14
16
18
2
20
4
6
8
Load Current (Amps)
21
21
18
18
15
15
12
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
3
0
12
9
6
20
3
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
18
18
15
15
Output Current (Amps)
21
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
55
60
65
70
75
80
85
80
85
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
21
12
50
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Output Current (Amps)
18
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Ambient Temperature (°C)
3
0
16
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
10
12
14
Output Load Curre nt (Amps)
12
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
3
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
0
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 9 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xS
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, without baseplate)
21
15
Output Current (Amps)
Output Current (Amps)
18
12
9
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
6
3
0
30
35
40
45
50
55
60
65
70
75
80
85
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
30
35
40
45
Ambient Temperature (°C)
18
17
15
Output Current (Amps)
Output Current (Amps)
16
14
13
12
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
8
7
6
30
35
40
45
50
55
60
65
70
75
80
85
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
30
40
45
Output Current (Amps)
Output Current (Amps)
50
55
60
65
Ambient Temperature (°C)
75
80
85
35
40
45
50
55
60
65
70
75
80
85
80
85
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, without baseplate)
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
35
70
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, without baseplate)
30
65
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Ambient Temperature (°C)
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
60
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, without baseplate)
19
10
55
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, without baseplate)
11
50
70
75
80
85
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
30
35
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_UWQ-12/20-T48 Series.A04 Page 10 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xS
Start-up Delay (Vin=48V, Iout=0A, Cload=5000µF, Ta=+25°C) Ch1= Vin, Ch2= Vout
Start-up Delay (Vin=48V, Iout=20A, Cload=5000µF, Ta=+25°C) Ch1= Vin, Ch2= Vout
Start-up Parallel Operation (Vin=48V, Iout=full load, Cload=10000µF, Ta=+25°C)
Ch1= Vin, Ch2, Ch3= Vout
Enable Start-up Delay (Vin=48V, Iout=20A, Cload=5000µF, Ta=+25°C) Ch1= Enable,
Ch2= Vout
Output Ripple and Noise (Vin=48V, Iout=0A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz)
Output Ripple and Noise (Vin=48V, Iout=20A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz)
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MDC_UWQ-12/20-T48 Series.A04 Page 11 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xS
Stepload Transient Response (Vin=48V, Iout=50-75-50% of Imax, Cload=1μF || 10μF, Io=10A/
div, Ta=+25°C) Ch2=Vout, Ch4=Iout
Thermal image with hot spot at 10.8A with 25°C ambient temperature.
Natural convection is used with no forced airflow.
Identifiable and recommended maximum value to be verified in application.
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MDC_UWQ-12/20-T48 Series.A04 Page 12 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xT
Efficiency vs. Line Voltage and Load Current @ +25°C
Power Dissipation vs. Load Current @ +25°C
30
94
92
25
Efficiency (%)
88
Power Dissipation (Watts)
90
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
86
84
82
80
78
76
20
15
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
10
5
74
72
70
0
2
2
4
6
8
10
12
14
16
18
20
4
6
8
10
12
14
Output Load Curre nt (Amps)
16
18
20
Load Current (Amps)
Thermal image with hot spot at 8.9A with 25°C ambient temperature. Natural convection is used with no forced airflow.
Identifiable and recommended maximum value to be verified in application
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MDC_UWQ-12/20-T48 Series.A04 Page 13 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xT
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
21
21
18
18
15
15
12
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
12
9
6
3
0
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
3
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
50
Ambient Temperature (°C)
21
21
18
18
15
15
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
65
70
75
80
85
80
85
12
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
9
6
3
0
60
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
12
55
Ambient Temperature (°C)
3
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
50
Ambient Temperature (°C)
55
60
65
70
75
Ambient Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, with baseplate)
21
Output Current (Amps)
18
15
12
9
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
6
3
0
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 14 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
PERFORMANCE DATA, UWQ-12/20-T48xT
Maximum Current Temperature Derating at sea level
(Vin = 18V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
Maximum Current Temperature Derating at sea level
(Vin = 24V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
Maximum Current Temperature Derating at sea level
(Vin = 36V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
Maximum Current Temperature Derating at sea level
(Vin = 48V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
Maximum Current Temperature Derating at sea level
(Vin = 60V, air flow from Pin 3 to Pin 1 on PCB, no baseplate)
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 15 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
TYPICAL PERFORMANCE DATA, UWQ-12/20-T48xT
Start-up Delay (Vin=48V, Iout=0A, Cload=5000µF, Ta=+25°C) Ch1= Vin, Ch2= Vout
Start-up Delay (Vin=48V, Iout=20A, Cload=5000µF, Ta=+25°C) Ch1= Vin, Ch2= Vout
On/Off Enable Delay (Vin=48V, Vout=nom, Iout=20A, Cload=5000μF, Ta=+25°C)
Ch1= Enable, Ch2= Vout.
Stepload Transient Response (Vin=48V, Iout=50-75-50% of Imax, Cload=1μF || 10μF, Io=10A/
div, Ta=+25°C) Ch2=Vout, Ch4=Iout
Output ripple and Noise (Vin=48V, Iout=0A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz)
Output ripple and Noise (Vin=48V, Iout=20A, Cload= 1μF || 10μF, Ta=+25°C, BW=20Mhz)
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 16 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
MECHANICAL SPECIFICATIONS (OPEN FRAME)—STANDARD AND T48xS MODELS
TOP VIEW
END VIEW
END VIEW
58.4
2.30
4.78
0.188*
[11.68]
0.46
36.8
1.45
1° MAX
(ALL PINS)
0.26
0.010
MIN
BOTTOM
CLEARANCE
Mtg Plane
SIDE VIEW
*Alternate pin lengths available (Contact Murata Power Solutions for information).
Pin location dimensions apply at circuit board level.
.062 SHOULDER
(AT 40 MIL PINS)
MATERIAL:
.040 PINS: COPPER ALLOY
.060 PINS: COPPER ALLOY
.083 SHOULDER
(AT 60 MIL PINS)
1.02±0.05
0.040±.002
@ PINS 1-3
FINISH: (ALL PINS)
GOLD (5µ"MIN) OVER NICKEL (50µ" MIN)
1.52±0.05
0.060±.002
@ PINS 4 & 8
50.80
2.000
REF
50.80
2.000
3.8
0.15
7.61
0.300
CL
3
4
15.24
0.600
2
1
8
BOTTOM VIEW
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
I/O Connections (pin side view)
Pin
1
2
3
Function
+Vin
Remote On/Off Control
-Vin
Pin
4
Function
-Vout
8
+Vout
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 17 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
MECHANICAL SPECIFICATIONS (BASEPLATE)—STANDARD AND T48xS MODELS
4x M3x0.5 THREADED HOLE
(.10 MAX SCREW PENETRATION)
TOP VIEW
58.4
2.30
END VIEW
END VIEW
12.7
0.50
47.24
1.860
4.78
0.188*
36.8
1.45
1° MAX
(ALL PINS)
26.16
1.030
0.26
0.010
MIN
BOTTOM
CLEARANCE
Mtg Plane
SIDE VIEW
OPTIONAL
BASEPLATE
'B' OPTION
*Alternate pin lengths available (Contact Murata Power Solutions for information).
Pin location dimensions apply at circuit board level.
.062 SHOULDER
(AT 40 MIL PINS)
MATERIAL:
.040 PINS: COPPER ALLOY
.060 PINS: COPPER ALLOY
.083 SHOULDER
(AT 60 MIL PINS)
1.02±0.05
0.040±.002
@ PINS 1-3
FINISH: (ALL PINS)
GOLD (5µ"MIN) OVER NICKEL (50µ" MIN)
1.52±0.05
.060±.002
@ PINS 4 & 8
50.80
2.000
REF
3.8
0.15
50.80
2.000
7.61
0.300
3
CL
4
15.24
0.600
2
1
8
BOTTOM VIEW
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
I/O Connections (pin side view)
Pin
1
2
3
Function
+Vin
Remote On/Off Control
-Vin
Pin
4
Function
-Vout
8
+Vout
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 18 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
RECOMMENDED FOOTPRINT—STANDARD AND T48xS MODELS
Recommended Footprint
(view through converter)
REF: DOSA Standard Specification
for Quarter-Brick DC/DC Converters
FINISHED HOLE SIZES
@ PINS 1-3
TOP VIEW
(PER IPC-D-275, LEVEL C)
0.048-0.062
CL
(PRI)
(SEC)
1
37.3
1.47
CL
8
7.62
0.300
2
7.62
0.300
4
3
CL
FINISHED HOLE SIZES
@ PINS 4 & 8
0.100 MIN
@ 1-4, 8
FOR PIN
SHOULDERS
(PER IPC-D-275, LEVEL C)
25.4
1.00
0.070-0.084
50.80
2.000
58.9
2.32
It is recommended that no parts be placed beneath converter (hatched area).
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
I/O Connections (pin side view)
Pin
1
2
3
Function
+Vin
Remote On/Off Control
-Vin
Pin
4
Function
-Vout
8
+Vout
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 19 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
MECHANICAL SPECIFICATIONS (OPEN FRAME)—T48xT MODELS
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 20 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
MECHANICAL SPECIFICATIONS (BASEPLATE)—T48xT MODELS
TOP VIEW
END VIEW
58.4
2.30
END VIEW
12.2
0.48
47.24
1.860
4.78
0.188
36.8
1.45
1° MAX
(ALL PINS)
26.16
1.030
M3x0.5 x 0.10 MAX
PENETRATION (x4)
0.25
0.010
MIN
BOTTOM
CLEARANCE
Mtg Plane
SIDE VIEW
0.062 SHOULDER
(AT 40 MIL PINS)
MATERIAL:
0.040 PINS: COPPER ALLOY
0.062 PINS: COPPER ALLOY
1.57±0.05
0.062±0.002
@PINS 4 & 8
1.02±0.05
0.040±0.002
@PINS 1-3
FINISH: (ALL PINS)
"MIN) OVER NICKEL (50
GOLD (5
" MIN)
2.000
REF
50.80
2.000
3.8
0.15
3.81
0.150
7.62
0.300
1. ALTERNATE PIN LENGTHS AVAILABLE
(SEE PART NUMBER STRUCTURE)
2. COMPONENTS SHOWN ARE FOR REF ONLY
3. DIMENSIONS ARE IN INCHES [mm]
4. PIN LOCATION DIMENSIONS APPLY AT
CIRCUIT BOARD LEVEL
5. THESE CONVERTERS MEET THE MECHANICAL
SPECIFICA
TIONS OF A
QUARTER BRICK DC-DC
CONVERTER
3
7.62
0.300
4
5
6
2
CL
7
8
1
BOTTOM VIEW
(PIN SIDE)
3.81
0.150
3.81
0.150
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
+Vin
2
Remote On/Off *
3
-Vin
4
-Vout
5
-Sense
6
Trim
7
+Sense
8
+Vout
*The Remote On/Off can be provided
with either positive (P suffix) or
negative (N suffix) logic.
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 21 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
RECOMMENDED FOOTPRINT—T48xT MODELS
Recommended Footprint
(view through converter)
REF: DOSA Standard Specification
for Quarter-Brick DC/DC Converters
FINISHED HOLE SIZES
@ PINS 1-3
TOP VIEW
(PER IPC-D-275, LEVEL C)
0.048-0.062
CL
(PRI)
(SEC)
1
37.3
1.47
CL
8
2
7.62
0.300
7.62
0.300
4
3
CL
FINISHED HOLE SIZES
@ PINS 4 & 8
0.100 MIN
@ 1-4, 8
FOR PIN
SHOULDERS
(PER IPC-D-275, LEVEL C)
25.4
1.00
0.070-0.084
50.80
2.000
58.9
2.32
It is recommended that no parts be placed beneath converter (hatched area).
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 22 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
STANDARD PACKAGING
BASEPLATE VERSION
9.92
(251.97)
REF
9.92
(251.97)
REF
Each static dissipative polyethylene
foam tray accommodates
15 converters in a 3 x 5 array.
0.88 (22.35)
REF
4.25 (108) ±.25
closed height
2.75 (69.85) ±.25
closed height
11.00 (279.4) ±.25
10.50 (266.7) ±.25
10.0 (25
Carton accommodates two (2) trays yielding 30 converters per carton
Carton accommodates two (2)
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 23 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. For greatest
safety, we recommend a fast blow fuse installed in the ungrounded input supply
line.
The installer must observe all relevant safety standards and regulations. For safety
agency approvals, install the converter in compliance with the end-user safety
standard.
Parallel Load Sharing (S Option, Load Sharing)
Two or more converters may be connected in parallel at both the input and output
terminals to support higher output current (total power, see figure 2) or to improve reliability due to the reduced stress that results when the modules are operating below
their rated limits. For applications requiring current share, follow the guidelines below.
The output voltage will decrease when the load current is increased. Our goal is to
have each converter contribute nearly identical current into the output load under all
input, environmental and load conditions.
F1
+Vin
+Vout
On/Off
–Vin
–Vout
+
+
Input
Source
–
+
Input
Filter
–
On/Off Signal
F2
+Vin
+Vout
LOAD
On/Off
–Vin
–Vout
–
F3
+Vin
+Vout
Vin
CH1
On/Off
CH2
Vout
CH3
CH1 = Vin
CH2 = On/Off
CH3 = Vout
Figure 3. Typical Turn On for Positive Logic Modules
CAUTION: This converter is not internally fused. To avoid danger to persons or
equipment and to retain safety certification, the user must connect an external
fast-blow input fuse as listed in the specifications. Be sure that the PC board pad
area and etch size are adequate to provide enough current so that the fuse will
blow with an overload.
Using Parallel Connections – Redundancy (N+1)
The redundancy connections in figure 4 requires external user supplied “OR”ing
diodes or “OR”ing MOSFETs for reliability purposes. The diodes allow for an
uninterruptable power system operation in case of a catastrophic failure (shorted
output) by one of the converters.
The diodes should be identical part numbers to enhance balance between the
converters. The default factory nominal voltage should be sufficiently matched
between converters. The OR’ing diode system is the responsibility of the user. Be
aware of the power levels applied to the diodes and possible heat sink requirements.
On/Off
–Vin
–Vout
Figure 2. Load Sharing Block Diagram
Using Parallel Connections – Load Sharing (Power Boost)
All converters must be powered up and powered down simultaneously. Use a
common input power source.
It is required to use a common Remote On/Off logic control signal to turn on
modules (see figure 2).
When Vin has reached steady state, apply control signal to the all modules.
Figure 3 illustrates the turn on process for positive logic modules.
First power up the parallel system (all converters) with a load not exceeding the
rated load of each converter and allow converters to settle (typically 20-100mS)
before applying full load. As a practical matter, if the loads are downstream
PoL converters, power these up shortly after the converter has reached steady
state output. Also be aware of the delay caused by charging up external bypass
capacitors.
It is critical that the PCB layout incorporates identical connections from each module to the load; use the same trace rating and airflow/thermal environments. If you
add input filter components, use identical components and layout.
When converters are connected in parallel, allow for a safety factor of at least
10%. Up to 90% of max output current can be used from each module.
F1
+Vin
+Vout
On/Off
–Vin
–Vout
+
+
Input
Source
–
+
Input
Filter
–
On/Off Signal
F2
+Vin
+Vout
LOAD
On/Off
–Vin
–Vout
–
F3
+Vin
+Vout
On/Off
–Vin
–Vout
Figure 4. Redundant Parallel Connections
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MDC_UWQ-12/20-T48 Series.A04 Page 24 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
Schottky power diodes with approximately 0.3V drops or “OR”ing MOSFETs may
be suitable in the loop whereas 0.7 V silicon power diodes may not be advisable.
In the event of an internal device fault or failure of the mains power modules on
the primary side, the other devices automatically take over the entire supply of
the loads. In the basic N+1 power system, the “N” equals the number of modules
required to fully power the system and “+1” equals one back-up module that will
take over for a failed module. If the system consists of two power modules, each
providing 50% of the total load power under normal operation and one module
fails, another one delivers full power to the load. This means you can use smaller
and less expensive power converters as the redundant elements, while achieving
the goal of increased availability.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input
voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not
occur until the input voltage rises again above the Start-Up Threshold. This built-in
hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage Shutdown
whose voltage decays as input current is consumed (such as capacitor inputs), the
converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well
above the UV Shutdown voltage AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout Start-Up
Delay (see Specifications) is the time interval between the point when the rising input
voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage
enters and remains within its specified regulation band. Actual measured times will vary
with input source impedance, external input capacitance, input voltage slew rate and
final value of the input voltage as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the PWM
controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to Vout regulated assumes that
the converter already has its input voltage stabilized above the Start-Up Threshold
before the On command. The interval is measured from the On command until the
output enters and remains within its specified regulation band. The specification
assumes that the output is fully loaded at maximum rated current.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input
voltage regulation. Since real-world voltage sources have finite impedance, performance is improved by adding external filter components. Sometimes only a small
ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors
must accept high speed switching currents.
Because of the switching nature of DC-DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate
DC input regulation. Performance will degrade with increasing input inductance.
Excessive input inductance may inhibit operation. The DC input regulation specifies
that the input voltage, once operating, must never degrade below the Shut-Down
Threshold under all load conditions. Be sure to use adequate trace sizes and
mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors
(Cin in the figure) serve primarily as energy storage elements, minimizing line
voltage variations caused by transient IR drops in the input conductors. Users
should select input capacitors for bulk capacitance (at appropriate frequencies),
low ESR and high RMS ripple current ratings. In the figure below, the Cbus and Lbus
components simulate a typical DC voltage bus. Your specific system configuration
may require additional considerations. Please note that the values of Cin, Lbus and
Cbus may vary according to the specific converter model.
In critical applications, output ripple and noise (also referred to as periodic and
random deviations or PARD) may be reduced by adding filter elements such as
TO
OSCILLOSCOPE
VIN
CURRENT
PROBE
+VIN
LBUS
+
–
+
–
CBUS
CIN
−VIN
CIN = 33µF, ESR < 200mΩ @ 100kHz
CBUS = 220µF, 100V
LBUS = 12µH
Figure 5. Measuring Input Ripple Current
multiple external capacitors. Be sure to calculate component temperature rise
from reflected AC current dissipated inside capacitor ESR.
+VOUT
C1
C2
SCOPE
RLOAD
−VOUT
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 6. Measuring Output Ripple and Noise (PARD)
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 25 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
Floating Outputs
Since these are isolated DC-DC converters, their outputs are “floating” with respect
to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW
between input and output. Real-world converters however do exhibit tiny leakage
currents between input and output (see Specifications). These leakages consist of
both an AC stray capacitance coupling component and a DC leakage resistance.
When using the isolation feature, do not allow the isolation voltage to exceed
specifications. Otherwise the converter may be damaged. Designers will normally
use the negative output (-Output) as the ground return of the load circuit. You
can however use the positive output (+Output) as the ground return to effectively
reverse the output polarity.
Minimum Output Loading Requirements
These converters employ a synchronous rectifier design topology. All models regulate
within specification and are stable under no load to full load conditions. Operation
under no load might however slightly increase output ripple and noise.
Thermal Shutdown
To protect against thermal over-stress, these converters include thermal shutdown
circuitry. If environmental conditions cause the temperature of the DC-DC’s to
rise above the Operating Temperature Range up to the shutdown temperature,
an on-board electronic temperature sensor will power down the unit. When the
temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may shut
down suddenly without warning. Be sure to thoroughly test your application to
avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of conditions.
The Derating curves show the maximum continuous ambient air temperature and
decreasing maximum output current which is acceptable under increasing forced airflow
measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in temperature and/or current or
reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter itself
which is obviously running at higher temperature than the outside air. Also note
that “natural convection” is defined as very low flow rates which are not using fanforced airflow. Depending on the application, “natural convection” is usually about
30-65 LFM but is not equal to still air (0 LFM).
Murata Power Solutions makes Characterization measurements in a closed cycle
wind tunnel with calibrated airflow. We use both thermocouples and an infrared
camera system to observe thermal performance. As a practical matter, it is quite
difficult to insert an anemometer to precisely measure airflow in most applications. Sometimes it is possible to estimate the effective airflow if you thoroughly
understand the enclosure geometry, entry/exit orifice areas and the fan flowrate
specifications.
CAUTION: If you exceed these Derating guidelines, the converter may have an
unplanned Over Temperature shut down. Also, these graphs are all collected near
Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Overvoltage Protection (OVP)
This converter monitors its output voltage for an over-voltage condition using an
on-board electronic comparator. The signal is optically coupled to the primary side
PWM controller. If the output exceeds OVP limits, the sensing circuit will power
down the unit, and the output voltage will decrease. After a time-out period, the
PWM will automatically attempt to restart, causing the output voltage to ramp up
to its rated value. It is not necessary to power down and reset the converter for this
automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive levels, the
OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to
as “hiccup” mode.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However, your application circuit may need additional protection. In the
extremely unlikely event of output circuit failure, excessive voltage could be applied to
your circuit. Consider using an appropriate external protection.
Current Limiting (Power limit with current mode control)
As power demand increases on the output and enters the specified “limit inception
range” (current in voltage mode and power in current mode) limiting circuitry
activates in the DC-DC converter to limit/restrict the maximum current or total
power available. In voltage mode, current limit can have a “constant or foldback”
characteristic. In current mode, once the current reaches a certain range the
output voltage will start to decrease while the output current continues to increase,
thereby maintaining constant power, until a maximum peak current is reached
and the converter enters a “hiccup” (on off cycling) mode of operation until the
load is reduced below the threshold level, whereupon it will return to a normal
mode of operation. Current limit inception is defined as the point where the output
voltage has decreased by a pre-specified percentage (usually a 2% decrease from
nominal).
Short Circuit Condition (Current mode control)
The short circuit condition is an extension of the “Current Limiting” condition. When
the monitored peak current signal reaches a certain range, the PWM controller’s
outputs are shut off thereby turning the converter “off.” This is followed by an
extended time out period. This period can vary depending on other conditions such
as the input voltage level. Following this time out period, the PWM controller will
attempt to re-start the converter by initiating a “normal start cycle” which includes
softstart. If the “fault condition” persists, another “hiccup” cycle is initiated. This
“cycle” can and will continue indefinitely until such time as the “fault condition” is
removed, at which time the converter will resume “normal operation.” Operating in
the “hiccup” mode during a fault condition is advantageous in that average input
and output power levels are held low preventing excessive internal increases in
temperature.
Remote On/Off Control
On the input side, a remote On/Off Control can be specified with either positive or
negative logic as follows:
Positive: Models equipped with positive logic are enabled when the On/Off pin is
left open or is pulled high to +13.5Vdc with respect to –Vin. An internal bias current causes the open pin to rise to +Vin. Positive-logic devices are disabled when
the On/Off is grounded or brought to within a low voltage (see Specifications) with
respect to –Vin.
Negative: Models with negative logic are on (enabled) when the On/Off is grounded
or brought to within a low voltage (see Specifications) with respect to –Vin. The
device is off (disabled) when the On/Off is left open or is pulled high to +13.5Vdc
Max. with respect to –Vin.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 26 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
Dynamic control of the On/Off function should be able to sink the specified signal
current when brought low and withstand specified voltage when brought high. Be
aware too that there is a finite time in milliseconds (see Specifications) between
the time of On/Off Control activation and stable, regulated output. This time will
vary slightly with output load type and current and input conditions.
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open
collector transistor or a relay (which can thereupon be controlled by logic). The
On/Off prefers to be set at approx. +13.5V (open pin) for the ON state, assuming
positive logic.
CAUTION: Do not apply voltages to the On/Off pin when there is no input power
voltage. Otherwise the converter may be permanently damaged.
[1] Conducted Emissions Parts List
Reference
Part Number
Description
L1
L3
C8
PE-62913
500uH,10A, MPS
C7
VZ Series
C16, C17
1mH, 6A
500uH,10A
2.2µFd
Qty 2 - Electrolytic Capacitor
22µFd, 100V
.22µFd
Vendor
Pulse
Murata
Murata
Panasonic
Unknown
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
HP11947A Transient Limiter (Agilent)
OHMITE 25W – Resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
[3] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For greater
emissions suppression, consider additional filter components and/or shielding.
Emissions performance will depend on the user’s PC board layout, the chassis
shielding environment and choice of external components. Please refer to Application Note GEAN02 for further discussion.
+VCC
ON/OFF
CONTROL
-VIN
Since many factors affect both the amplitude and spectra of emissions, we recommend using an engineer who is experienced at emissions suppression.
Figure 7. Driving the On/Off Control Pin (suggested circuit)
Emissions Performance
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your own
emissions testing, make sure the output load is rated at continuous power while
doing the tests.
The recommended external input and output capacitors (if required) are included.
Please refer to the fundamental switching frequency. All of this information is listed
in the Product Specifications. An external discrete filter is installed and the circuit
diagram is shown below.
UWQ EMI 200W Test Card
48Vdc in, 12Vout, 17Amps
Resistive
Load
UUT
V+
Black
C16
C17
C8
C8
C8
C8
L3
C8
C8
C7
Vin +
Vout +
Vin -
Vout -
L1
V-
Resistive
Load
inside a
metal
container
Trimming Output Voltage
UWQ converters have a trim capability (pin 6) that enables users to adjust the
output voltage from +10% to –10% (refer to the trim equations in the table below).
Adjustments to the output voltage can be accomplished with a single fixed resistor
as shown in Figures 9 and 10. A single fixed resistor can increase or decrease
the output voltage depending on its connection. Resistors should be located close
to the converter and have TCR’s less than 100ppm/°C to minimize sensitivity to
changes in temperature. If the trim function is not used, leave the trim pin open.
Standard UWQs have a “positive trim” where a single resistor connected from the
Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage. A resistor
connected from the Trim Pin (pin 6) to the –Sense (pin 5) will decrease the output
voltage.
Trim adjustments greater than the specified +10%/–10% can have an adverse
affect on the converter’s performance and are not recommended. Excessive voltage differences between VOUT and Sense, in conjunction with trim adjustment of
the output voltage, can cause the overvoltage protection circuitry to activate (see
Performance Specifications for overvoltage limits).
Temperature/power derating is based on maximum output current and voltage at
the converter’s output pins. Use of the trim and sense functions can cause output
voltages to increase, thereby increasing output power beyond the UWQ’s specified rating, or cause output voltages to climb into the output overvoltage region.
Therefore:
(VOUT at pins) x (IOUT) ≤ rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to
Figure 8. Conducted Emissions Test Circuit
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 27 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
noise pickup when connected to long conductors in noisy environments.
Contact and PCB resistance
losses due to IR drops
Trim Equations
+VIN
Trim Up
+VOUT
I OUT
Trim Down
+SENSE
Sense Current
UVQ-1.5/40-D24
*Vo = Desirable output
voltage
in Volts
6.23(V
O – 1.226)
–10.2
RT UP (kΩ) =
VO – 1.5
+VIN
RT UP (kΩ) =
RT DOWN (kΩ) =
7.64
1.5 – VO
–10.2
UVQ-2.5/40-D48, UVQ-2.5/35-D24
VO –
ON/OFF
CONTROL
+SENSE
–10.2
2.5
RT DOWN (kΩ) =
TRIM
2.5 – VO
–10.2
UVQ-3.3/35-D48
–10.2
–VOUT
RT DOWN (kΩ) =
16.31
3.3 – VO
20.4(VO – 1.226)
VO – 5
–10.2
RT DOWN (kΩ) =
–10.2
–10.2
UVQ-12/8-D24, -12/10-D48
+SENSE
49.6(VO – 1.226)
ON/OFFVO –
CONTROL
5 – VO
+VOUT
+VIN
RT UP (kΩ) =
25.01
12
–10.2
RT DOWN (kΩ) =
TRIM
60.45
12LOAD
– VO
–VIN
-VOUT
Figure 11. Remote Sense Circuit Configuration
UVQ-5/25-D24,
UVQ-5/20-D48
Figure 9. Trim Connections
To Increase Output
Voltages Using Fixed Resistors
RT UP (kΩ) =
Sense Return
Contact and PCB resistance
losses due to IR drops
LOAD
–SENSE
VO – 3.3
LOAD
I OUT Return
12.26
RTRIM UP
13.3(VO – 1.226)
TRIM
−SENSE
+VOUT
10(VO – 1.226)
RT UP (kΩ) = –VIN
ON/OFF
CONTROL
Any long, distributed wiring and/or significant inductance introduced into the Sense
control loop can adversely affect overall system stability. If in doubt, test your applications by observing the converter’s output transient response during step loads.
There should not be any appreciable ringing or oscillation. You may also adjust the
output trim slightly to compensate for voltage loss in any external filter elements.
Do not exceed maximum power ratings.
–10.2
RTRIM DOWN
UVQ-15/7-D24,
-D48
–SENSE
62.9(VO – 1.226)
–10.2
–VOUT
RT UP (kΩ) = –VIN
VO – 15
RT DOWN (kΩ) =
76.56
15 – VO
–10.2
Figure 10. Trim Connections
To Decrease Output
Voltages Using Fixed Resistors
UVQ-18/5.6-D24,
-18/6-D48
75.5(VO – 1.226)
92.9
210.75(VO – 1.226)
250
Remote
Sense
–10.2
–10.2
RT DOWN (kΩ) =
RT UP (kΩ)
= Input
18 – VO
VO – 18
Use the Sense inputs with caution. Sense is normally connected at the load.
Sense inputs compensate for output
voltage inaccuracy
UVQ-24/4.5-D24,
-D48 delivered at the load. This
is done by correcting IR voltage drops along the output wiring and the current
124.2
101(V
O – 1.226)
carrying capacity of
PC board
etch. This
outputRdrop
(the difference
between
Sense
–10.2
–10.2
T DOWN (kΩ) =
RT UP (kΩ) =
24 – V
O
VO –at24the converter) should not exceed 0.5V.
and Vout when measured
Consider
using
heavier wire if this drop is excessive. Sense inputs also improve the stability of the
UVQ-48/2.5-D24, -D48
converter and load system by optimizing the control loop phase margin.
Note:RTThe
Sense
lines areRTinternally
connected through
low
–10.2
–10.2
(kΩ)
= input and power Vout
DOWN (kΩ) =
UP
– VO
O – 48
value resistors to their Vrespective
polarities so that the converter48can
operate
without external connection to the Sense. Nevertheless, if the Sense function is not
used for remote regulation, the user should connect +Sense to +Vout and –Sense
to –Vout at the converter pins.
The remote Sense lines carry very little current. They are also capacitively coupled
to the output lines and therefore are in the feedback control loop to regulate and
stabilize the output. As such, they are not low impedance inputs and must be
treated with care in PC board layouts. Sense lines on the PCB should run adjacent
to DC signals, preferably Ground. In cables and discrete wiring, use twisted pair,
shielded tubing or similar techniques.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 28 of 29
UWQ-12/20-T48 Series
Wide Input, Isolated DOSA Quarter Brick DC-DC Converters
Vertical Wind Tunnel
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products. The
system includes a precision low flow-rate anemometer, variable
speed fan, power supply input and load controls, temperature
gauges, and adjustable heating element.
The IR camera monitors the thermal performance of the Unit
Under Test (UUT) under static steady-state conditions. A special
optical port is used which is transparent to infrared wavelengths.
IR Video
Camera
Heating
element
Precision
low-rate
anemometer
3” below UUT
Both through-hole and surface mount converters are soldered
down to a host carrier board for realistic heat absorption and
spreading. Both longitudinal and transverse airflow studies are
possible by rotation of this carrier board since there are often
significant differences in the heat dissipation in the two airflow
directions. The combination of adjustable airflow, adjustable
ambient heat, and adjustable Input/Output currents and voltages mean that a very wide range of measurement conditions
can be studied.
The collimator reduces the amount of turbulence adjacent to
the UUT by minimizing airflow turbulence. Such turbulence
influences the effective heat transfer characteristics and gives
false readings. Excess turbulence removes more heat from
some surfaces and less heat from others, possibly causing
uneven overheating.
Ambient
temperature
sensor
Airflow
collimator
Both sides of the UUT are studied since there are different thermal
gradients on each side. The adjustable heating element and fan,
built-in temperature gauges, and no-contact IR camera mean that power
supplies are tested in real-world conditions.
Figure 12. Vertical Wind Tunnel
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may
cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
For Sn/Pb based solders:
Maximum Preheat Temperature
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
Murata Power Solutions, Inc.
. 129 Flanders Road
Westborough, MA 01581
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: https://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical
information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of
licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice.
© 2020 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_UWQ-12/20-T48 Series.A04 Page 29 of 29
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