UCQ-2.5/30-D48N-Y [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, 75W, Hybrid, QUARTER BRICK PACKAGE-8;型号: | UCQ-2.5/30-D48N-Y |
厂家: | muRata |
描述: | DC-DC Regulated Power Supply Module, 1 Output, 75W, Hybrid, QUARTER BRICK PACKAGE-8 |
文件: | 总24页 (文件大小:549K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Single Output UCQ Models
s
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
Typical units
FEATURES
PRODUCT OVERVIEW
ꢀ
For applications requiring improved electrical and
thermal performance at reduced cost, consider
DATEL’s new UCQ series “quarter brick” DC/DC
power converters. These compact units measure
just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm)
and fit the industry-standard footprint.
The UCQ’s feature full isolation to 2250Vdc
meeting BASIC insulation requirements of
Standard quarter-brick package/pinout
ꢀ
Low cost; Low profile, 0.4" (10.2mm)
UL/EN/IEC 60950-1. Input filters reduce propa-
gated switching noise back to input sources. Also
included is a remote On/Off switch control (with
positive or negative polarity), output trim adjustable
over nominal and output sense functions to reduce
ꢀ
24V or 48V nominal input
ꢀ
Outputs: 1.2V to 15V
ꢀ
Interleaved synchronous-rectifier topology
• Ultra high efficiency
• No output reverse conduction
Available outputs range between 1.2V @ 30 Amps
to 15V @ 6.7 Amps and accept a wide input range. power lead losses. Extensive protection items
The UCQ’s interleaved, synchronous-rectifier
topology offers high efficiency (up to 93%), tight
line and load regulation, low noise and fast step
response. A single-board optimized open-frame
design contributes to impressive thermal opera-
tion. UCQ’s will operate up to +70°C and 100 LFM
airflow with no derating.
avoid damage from out of limit voltages, currents
and temperatures. Protection faults automatically
recover using the hiccup technique. Besides safety
testing to 60950-1, certifications for the UCQ in-
clude application for EMC compliance (to EN55022/
CISPR22 with filter), qualification testing.
ꢀ
Outstanding thermal performance
ꢀ
On/off control, trim & sense functions
ꢀ
Fully isolated, 2250Vdc (BASIC)
Output overvoltage protection
ꢀ
Fully I/O protected; Thermal shutdown
ꢀ
Designed to meet UL/EN/IEC60950-1
safety approvals
+SENSE
(7)
+VOUT
(8)
+VIN
(3)
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)
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
Typical topology may vary between units.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 1 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Output
Input
R/N (mVp-p)
Regulation (Max.) ➁
Line Load
IIN full
load
Efficiency
VOUT
IOUT
Power
VIN Nom.
(Volts)
Range
IIN no
(Volts) (Amps) (Watts) Typ.
Max.
(Volts) load (mA) (Amps)
Min.
Typ.
Root Models ➀
UCQ-1.2/40-D24P-C
UCQ-1.2/30-D48N-C
UCQ-1.5/25-D48N-C
UCQ-1.5/40-D48N-C
UCQ-1.8/30-D48N-C
UCQ-1.8/40-D48N-C
UCQ-2.5/40-D24P-C
UCQ-2.5/30-D48N-C
UCQ-3.3/35-D24P-C
UCQ-3.3/20-D48N-C
UCQ-3.3/30-D48N-C
UCQ-3.3/40-D48N-C
UCQ-5/20-D24P-C
UCQ-5/20-D48N-C
UCQ-5/25-D48N-C
UCQ-12/8.3-D48N-C
UCQ-15/6.7-D48N-C
1.2
1.2
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
5
40
30
25
40
30
40
40
30
35
20
30
40
20
20
25
8.3
48
36
Please contact Murata Power Solutions for further information.
50
50
50
80
50
80
50
80
50
50
60
50
35
50
100
100
80
0.125%
0.125%
0.125%
0.125%
0.1%
0.25%
0.25%
0.25%
0.25%
0.2%
48
48
48
48
48
24
48
24
48
48
48
24
48
48
48
48
36-75
36-75
36-75
36-75
36-75
18-36
36-75
18-36
36-75
36-75
36-75
18-36
36-75
36-75
36-75
36-75
30
50
0.90
0.94
1.45
1.31
1.70
4.96
1.80
5.41
1.53
2.3
81%
81%
85%
83%
86%
82%
85%
87%
88.5%
89.5%
89%
88%
89%
88%
90%
90%
83%
83%
86%
86%
88%
84%
87%
89%
90%
91%
90%
91.5%
92%
90%
91%
92%
37.5
60
100
100
100
120
100
120
80
50
54
45
72
30
100
75
0.125%
0.125%
0.25%
0.25%
0.25%
0.25%
0.25%
0.25%
0.2%
120
50
115.5
66
130
50
0.125%
0.125%
0.1%
99
80
50
132
100
100
125
99.6
100
60
30
3.06
4.55
2.26
2.89
2.28
2.28
0.125%
0.125%
0.125%
0.125%
0.125%
0.25%
0.25%
0.25%
0.25%
0.25%
160
80
5
55
5
100
150
150
30
12
15
80
100
6.7 100.5 100
➀ Please refer to the part number structure for additional ordering part numbers and options.
➁ All specifications are at nominal line voltage and full load, +25 deg.C unless otherwise noted. See detailed specifications. Output capacitors are 1 μF ceramic || 10 μF electrolytic. I/O caps are necessary for
our test equipment and may not be needed for your application.
Outline dimensions: 2.3 × 1.45 × 0.40 inches
58.4 × 36.8 × 10.2 mm
Pinout: P32 (all models)
PART NUMBER STRUCTURE
U CQ - 3.3 / 30 D48 N B H Lx - C
-
Output
Configuration:
Unipolar,
single output
RoHS Hazardous Materials compliance
C = RoHS-6, standard (does not claim EU RoHS exemption 7B–lead in solder)
Y = RoHS-5 (with lead), optional, special order
Pin length option
Blank = standard pin length 0.180 in. (4.6 mm)
L1 = 0.110 in. (2.79 mm)*
Quarter-Brick Package
Nominal Output Voltage
L2 = 0.145 in. (3.68 mm)*
*Special quantity order is required;
no sample quantities available.
Maximum Rated Output :
Current in Amps
Conformal coating (optional)
Blank = no coating, standard
H = coating added, optional special order
Input Voltage Range:
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Note:
Baseplate (optional)
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
Blank = No baseplate, standard
B = Baseplate installed, optional special order
On/Off Control Polarity
P = Positive polarity (standard for D24, optional for D48)
N = Negative polarity (standard for D48, optional for D24)
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MDC_UCQ Models.B20 Page 2 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Input
Input voltage range
Start-up threshold, Volts
See ordering guide.
34
34
33
34
32
34
34
32
Undervoltage
shutdown, V
32.5
none
32.5
Overvoltage shutdown
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent
Input Current
Full load conditions
Inrush transient, A2sec
Output short circuit, mA
See ordering guide.
0.05
50-200, model dependent
Low line (VIN = min.),
Amps
1.23
1.26
L-C
1.96
1.74
2.30
Standby mode, mA
(Off, UV, OT shutdown)
1-10, model dependent
Pi-type
Internal input filter type
Pi-type
Pi-type
Pi-type
Reverse polarity
protection
None, install external fuse.
Remote On/Off Control
Positive logic
OFF = Ground pin to +0.8V
(P model suffix)
ON = Open or +3.5 to +13.5V max
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
Current, mA
1
Output
Voltage output range
Voltage output accuracy
See ordering guide.
1% of VNOM., (50% load)
Adjustment range,
% of VNOM.
10%
−20 + 10
10%
10%
10%
Temperature coefficient
Minimum loading
0.02% of VOUT range per °C
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
Efficiency
See ordering guide.
See ordering guide.
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
1,000
10,000
10,000
4,700
10,000
resistive load
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 3 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Input
Input voltage range
Start-up threshold, Volts
See ordering guide.
17
16.8
15
34
32
35
35
34
Undervoltage
shutdown, V
15
none
34
Overvoltage shutdown
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent
Input Current
Full load conditions
Inrush transient, A2sec
Output short circuit, mA
See ordering guide.
0.05
50-200, model dependent
Low line (VIN = min.),
Amps
6.69
Pi
2.39
L-C
7.21
2.04
Pi
3.02
Pi
Standby mode, mA
(Off, UV, OT shutdown)
1-10, model dependent
L-C
Internal input filter type
Reverse polarity
protection
None, install external fuse.
Remote On/Off Control
Positive logic
OFF = Ground pin to +0.8V
(P model suffix)
ON = Open or +3.5 to +13.5V max
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
Current, mA
1
Output
Voltage output range
Voltage output accuracy
See ordering guide.
1% of VNOM., (50% load)
Adjustment range,
% of VNOM.
−20 + 10
−20 + 10
10%
−10 to + 10%
Temperature coefficient
Minimum loading
0.02% of VOUT range per °C
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
Efficiency
See ordering guide.
See ordering guide.
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
10,000
10,000
10,000
10,000
10,000
resistive load
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 4 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-3.3/40-D48 UCQ-5/20-D24
UCQ-5/20-D48
UCQ-5/25-D48 UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
Input
Input voltage range
Start-up threshold, Volts
See ordering guide
33
17
16
35
34
35
34
35
34
34
Undervoltage
shutdown, V
31.5
31.5
Overvoltage shutdown
none
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent.
60 max.
Input Current
Full load conditions
Inrush transient, A2sec
Output short circuit, mA
See ordering guide.
0.05
0.1
0.03
120
1200
50-200, model dependent
Low line (VIN = min.),
Amps
4.12
6.04
L-C
3.02
3.82
3.04
L-C
3.03
Standby mode, mA
(Off, UV, OT shutdown)
1-10, model dependent
L-C
Internal input filter type
Pi
L-C
Pi
Reverse polarity
protection
None, install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +0.8V
ON = Open or +3.5 to +13.5V max
OFF = Ground pin or to +1V.
ON = Open or +2.5 to +13.5V
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
OFF = Open or +2.5 to +13.5V
ON = Ground pin or to +1V.
Current, mA
1
Output
Voltage output range
Voltage output accuracy
See ordering guide.
1% of VNOM., (50% load)
Adjustment range,
% of VNOM.
−10 to + 10%
Temperature coefficient
Minimum loading
0.02% of VOUT range per °C.
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
Efficiency
See ordering guide.
See ordering guide.
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
10,000
10,000
10,000
10,000
1,000
1000
resistive load
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 5 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Isolation Voltage
Input to Output,
Volts min.
2250
1500
1500
Input to baseplate,
Volts min.
Baseplate to output,
Volts min.
Isolation resistance, MΩ
Isolation capacitance, pF
Isolation safety rating
Miscellaneous
10-100, model dependent
1000
Basic insulation
Current limit inception
(98% of VOUT, after
warmup), Amps
35
35
49
35
49
Short circuit protection
method
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
5
Short circuit duration
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
1.8
1.8
1.95
2.7 V max
2.2
Dynamic characteristics
Dynamic load response 200 μSec to 1% 200 μSec to 1% 50 μSec to 1% of 100 μSec to 1% 50 μSec to 1% of
(50-75-50% load step) of final value
of final value
final value
of final value
final value
Start-up time
VIN to VOUT regulated,
mSec
10 max.
Remote On/Off to VOUT
regulated, mSec
10 max.
Switching frequency, KHz
350 20
2M hours
440 40
400 40
400
380 40
Environmental
Calculated MTBF
2.1M hours
2.2M hours
2M hours
2.1M hours
Operating temperature
range, °C
−40 to +85, with derating
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +120, model dependent
−55 to +125
Storage temperature
range, °C
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
To +85°C/85%, non-condensing
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 6 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Isolation Voltage
Input to Output,
Volts min.
2250
1500
1500
Input to baseplate,
Volts min.
Baseplate to output,
Volts min.
Isolation resistance, MΩ
Isolation capacitance, pF
Isolation safety rating
Miscellaneous
10-100, model dependent
1000
Basic insulation
Current limit inception
(98% of VOUT, after
warmup), Amps
46
37
41
24
35
Short circuit protection
method
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
5
12
5
Short circuit duration
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
2.95
2.95
4
4.6
4
Dynamic characteristics
Dynamic load response 200 μSec to 1% 200 μSec to 1% 200 μSec to 1% 200 μSec to 1.5% 200 μSec to 1%
(50-75-50% load step) of final value
of final value
of final value
of final value
of final value
Start-up time
VIN to VOUT regulated,
mSec
10 max.
Remote On/Off to VOUT
regulated, mSec
10 max.
Switching frequency, KHz
480
480 30
350 10
330 40
330 40
Environmental
Calculated MTBF
2.1M hours
2.2M hours
1.7M hours
1.8M hours
1.7M hours
Operating temperature
range, °C
−40 to +85, with derating
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +120, model dependent
−55 to +125
Storage temperature
range, °C
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
To +85°C/85%, non-condensing
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 7 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-3.3/40-D48 UCQ-5/20-D24
UCQ-5/20-D48
UCQ-5/25-D48 UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
Isolation Voltage
Input to Output,
Volts min.
2250
1500
1500
Input to baseplate,
Volts min.
Baseplate to output,
Volts min.
Isolation resistance, MΩ
Isolation capacitance, pF
Isolation safety rating
Miscellaneous
10-100, model dependent
1000
Basic insulation
Current limit inception
(98% of VOUT, after
warmup), Amps
49
26
22
27
10
9
Short circuit protection
method
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
15
5
5
5
TBD
2
Short circuit duration
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
4.25
6.25
TBD
6.2
14.4
18
Dynamic characteristics
Dynamic load response 50 μSec to 1% of 200 μSec to 1% 200 μSec to 1% 200 μSec to 1% 200 μSec to 1%
150 μSec to 2% of final value
(50-75-50% load step)
final value
of final value
of final value
of final value
of final value
Start-up time
VIN to VOUT regulated,
mSec
5
4
10 max.
10 max.
10 max.
10 max.
Remote On/Off to VOUT
regulated, mSec
5
4
10 max.
10 max.
10 max.
10 max.
Switching frequency, KHz
360 20
400 24
315 30
315 30
330 40
300 30 KHz
Environmental
Calculated MTBF
2.2M hours
2.2M hours
TBD
1.7M hours
1.8M hours
TBD
Operating temperature
range, °C.
−40 to +85, with derating
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +120, model dependent
−40 to +110
Storage temperature
range, °C
−55 to +125
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
To +85°C/85%, non-condensing
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 8 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Physical
Outline dimensions
Pin material
Pin diameter
Pin finish
See mechanical specs.
Copper alloy
0.040/0.062 inches (1.016/1.575 mm)
Nickel underplate with gold overplate
Weight, ounces
Weight, grams
0.9
25
1.06
30
0.9
25
0.9
25
1.23
35
Electromagnetic
interference
Designed to meet EN55022/CISPR22 (External filter required)
Safety
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Physical
Outline dimensions
Pin material
Pin diameter
Pin finish
See mechanical specs.
Copper alloy
0.040/0.062 inches (1.016/1.575 mm)
Nickel underplate with gold overplate
Weight, ounces
Weight, grams
1.06
30
1.06
30
1.06
30
0.7
20
1.06
30
Electromagnetic
interference
Designed to meet EN55022/CISPR22 (External filter required)
Safety
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
UCQ-3.3/40-D48 UCQ-5/20-D24
UCQ-5/20-D48
UCQ-5/25-D48 UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
Physical
Outline dimensions
Pin material
Pin diameter
Pin finish
See mechanical specs.
Copper alloy
0.040/0.062 inches (1.016/1.575 mm)
Nickel underplate with gold overplate
Weight, ounces
Weight, grams
1.25
35.5
1.06
30
1.06
30
1.06
30
1.13
32
1.034
29.3
Electromagnetic
interference
Designed to meet EN55022/CISPR22 (External filter required)
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
Safety
➀ Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 9 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
Specification Notes
(1) All models are tested and specified with external 1||10 μF ceramic/tantalum output capacitors no external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate
our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. All specifications are typical unless
noted. General conditions for Specifications are +25 deg.C, VIN and VOUT = nominal, full load. Adequate airflow must be supplied for extended testing under power.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is CIN = 33 μF, 100V tantalum, CBUS = 220 μF, 100V electrolytic, LBUS = 12 μH.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the
total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing altitude.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard = +25 deg.C, full output load, natural air convection.
(5) The On/Off Control is normally controlled by a switch or open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to
Input Common.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
(7) The outputs are not intended to sink appreciable reverse current.
(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction.
(9) All models are fully operational and meet published specifications, including “cold start” at –40 C.
(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme.
(11) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use 1% or better tolerance metal-film resistors mounted close to the converter.
(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load.
(15) Input Fusing: To ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +VIN input. Use approximately twice the full input current rating with
nominal input voltage.
(16) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This
short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation.
(17) Normally, the Sense lines are connected at the remote load to compensate for IR voltage drops in the power wiring and to improve dynamic response. If Sense is not used, each Sense pin should be con-
nected at the converter to its respective Vout pin.
Product Adaptations
Murata Power Solutions offers several variations of our core product family.
These products are available under scheduled quantity orders and may also
include separate manufacturing documentation from a mutually agreeable
Product Specification. Since these product adaptations largely share a common
parts list and similar specifications and test methods with their root products,
they are provided at excellent costs and delivery. Please contact Murata Power
Solutions for details.
These models are all negative On/Off polarity, no baseplate, conformal coat-
ing added, 3.68mm pin length, and RoHS-5 hazardous substance compliance
(with lead).
UCQ-3.3/30-D48NBHL2-Y
UCQ-3.3/40-D48NBHL2-Y
These models are all negative On/Off polarity, baseplate installed, conformal
coating added, 3.68mm pin length, and RoHS-5 hazardous substance compli-
ance (with lead).
As of this date, the following products are available:
UCQ-1.2/30-D48NHL2-Y
UCQ-1.8/30-D48NHL2-Y
Absolute Maximum Ratings
UCQ-1.8/40-D48NHL2-Y
Input Voltage
Continuous
Transient (100msec)
24V Models
0 to +36 Volts
+50 Volts
48V Models
0 to +75 Volts
+100 Volts
UCQ-2.5/30-D48NHL2-Y
UCQ-2.5/40-D48NHL2-Y
On/Off Control
Input Reverse Polarity Protection
Output Current
0V min. to +13.5V max.
See Fuse section
Current-limited. Devices can withstand
sustained short circuit without damage.
–40 to +100°C (with derating)
–55 to +125°C
UCQ-5/20-D48NHL2-Y
UCQ-12/8.3-D48NHL2-Y
Operating Temperature
Storage Temperature
These are stress ratings. Exposure of devices to greater than any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied, nor recommended.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 10 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-1.2/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
UCQ-1.2/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
95
35
30
25
90
85
80
75
70
20
V
IN = 36V
400 LFM
65
60
55
50
45
40
300 LFM
V
IN = 48V
15
200 LFM
V
IN = 75V
100 LFM
10
5
0
3
6
9
12
15
18
21
24
27
75
30
30
35
40
45
50
55
60
65
70
70
70
75
75
75
80
80
80
Load Current (Amps)
Ambient Temperature ( C)
°
UCQ-1.5/25-D48 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-1.5/25-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
90
88
86
84
82
80
78
30
25
20
15
10
VIN = 75V
76
74
72
70
68
66
64
62
60
V
IN = 48V
V
IN = 36V
400 LFM
300 LFM
200 LFM
5
100 LFM
0
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
30
35
40
45
50
55
60
65
Load Current (Amps)
Ambient Temperature ( C)
°
UCQ-1.8/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-1.8/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
90
32
30
28
26
24
88
86
84
V
IN = 36V
IN = 48V
IN = 75V
82
80
78
76
74
72
70
V
V
22
400 LFM
300 LFM
200 LFM
20
100 LFM
Natural convection
18
4
6
8
10
12
14
16
18
20
22
24
26
28
30
30
35
40
45
50
55
60
65
Load Current (Amps)
Ambient Temperature ( C)
°
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 11 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-1.8/40-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
UCQ-1.8/40-D48 Efficiency and Power Dissipation @25˚ C
95
22
20
18
16
14
12
10
8
45
40
35
30
90
85
V
IN = 75V
80
75
70
65
60
55
50
45
40
V
IN = 48V
400 LFM
V
IN = 36V
25
300 LFM
200 LFM
20
15
10
5
100 LFM
Natural Convection
6
4
Power Dissipation
IN = 48V
2
V
0
0
30
35
40
45
50
55
60
65
70
75
80
85
4
8
12
16
20
24
28
32
36
40
Ambient Temperature ( C)
°
Load Current (Amps)
UCQ-2.5/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-2.5/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 24V (at sea level)
95
35
30
25
20
15
90
85
80
75
V
IN = 75V
70
65
60
55
50
45
40
V
IN = 48V
V
IN = 36V
400 LFM
10
300 LFM
200 LFM
5
100 LFM
0
1
3
6
9
12
15
18
21
24
27
30
30
35
40
45
50
55
60
65
70
75
80
Load Current (Amps)
Ambient Temperature ( C)
°
UCQ-2.5/40-D24 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-2.5/40-D24 Maximum Current Temperature Derating
No baseplate, VIN = 24V (at sea level)
95
35
30
25
20
15
90
85
V
IN = 24V
80
75
70
65
60
55
50
V
IN = 18V
V
IN = 35V
10
400 LFM
300 LFM
5
200 LFM
100 LFM
0
3
6
9
12
15
18
21
24
27
30
33
36
39 40
30
35
40
45
50
55
60
65
70
75
80
Load Current (Amps)
Ambient Temperature ( C)
°
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 12 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/20-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, longitudinal airflow, no baseplate)
UCQ-3.3/20-D48 Efficiency vs Line Voltage and Load Current @25°C
95
18
15
12
9
20
90
85
18
100 LFM
200 LFM
16
14
12
10
VIN = 36V
80
75
70
65
VIN = 48V
300 LFM
6
V
IN = 75V
400 LFM
3
Power Dissipation
IN = 48V
V
0
30
35
40
45
50
55
60
65
70
75
80
85
2
5
8
11
14
17
20
Ambient Temperature (°C)
Load Current (Amps)
UCQ-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
UCQ-3.3/30-D48 Efficiency vs Line Voltage and Load Current @25°C
95
15
12
9
30
28
26
90
85
VIN = 36V
24
100 LFM
VIN = 48V
22
200 LFM
80
75
70
6
VIN = 75V
20
300 LFM
400 LFM
Power Dissipation
3
18
VIN = 48V
16
30
35
40
45
50
55
60
65
70
75
80
85
0
Ambient Temperature (°C)
3
6
9
12
15
18
21
24
27
30
Load Current (Amps)
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 13 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/35-D24 Efficiency vs Line Voltage and Load Current @25˚ C
92
90
88
86
84
82
80
78
76
74
72
70
VIN = 36V
VIN = 24V
VIN = 18V
3
5
7
9
11
15
17
19
21
23
25
27
29
31
33
35
Load Current (Amps)
UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level
UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, with baseplate, airflow is from -Vin to +Vin)
(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)
40
35
30
25
20
40
35
30
25
20
400 LFM
400 LFM
300 LFM
15
10
5
15
10
5
200 LFM
300 LFM
200 LFM
100 LFM
100 LFM
Natural Convection
Natural Convection
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Ambient Temperature (°C)
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 14 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/40-D48 Efficiency and Power Dissipation @25˚ C
95
90
85
80
75
70
65
60
55
50
45
22
20
18
16
14
12
10
8
VIN = 75V
V
IN = 48V
V
IN = 36V
6
4
Power Dissipation
IN = 48V
2
V
40
4
0
8
12
16
20
24
28
32
36
40
Load Current (Amps)
UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level
UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, transverse airflow)
(VIN = 48V, no baseplate, transverse airflow)
50
50
40
30
40
30
400 LFM
20
20
300 LFM
400 LFM
300 LFM
200 LFM
200 LFM
100 LFM
10
10
Natural Convection
100 LFM
Natural Convection
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
Ambient Temperature ( C)
°
°
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 15 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-5/20-D24 Efficiency and Power Dissipation @25°C
96
92
88
84
80
76
72
68
64
60
14
12
10
8
V
IN = 18V
VIN = 24V
6
V
IN = 36V
4
Power Dissipation
IN = 24V
V
2
0
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Load Current (Amps)
UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level
UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)
(VIN = 24V, with baseplate, airflow is from -Vin to +Vin)
22
20
18
16
25
20
14
100 LFM
100 LFM
15
12
200 LFM
200 LFM
10
10
8
6
4
2
0
300 LFM
300 LFM
400 LFM
400 LFM
5
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Ambient Temperature (°C)
UCQ-5/20-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from -Vin to +Vin)
UCQ-5/20-D48
Efficiency vs Line Voltage and Load Current @25°C
22
20
18
16
95
90
85
100 LFM
14
200 LFM
12
300 LFM
10
VIN = 36V
400 LFM
8
80
75
70
VIN = 50V
6
4
2
0
V
IN = 75V
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
4
6
8
10
12
14
16
18
20
Load Current (Amps)
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 16 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-5/25-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
UCQ-5/25-D48 Efficiency and Power Dissipation @25˚ C
95
18
16
14
12
10
8
30
25
20
90
85
VIN = 75V
V
IN = 48V
80
75
70
65
60
55
50
V
IN = 36V
15
400 LFM
300 LFM
6
10
200 LFM
100 LFM
4
5
0
Power Dissipation
2
VIN = 48V
0
30
35
40
45
50
55
60
65
70
75
80
85
3
5
7
9
11
13
15
17
19
21
23
25
Ambient Temperature ( C)
Load Current (Amps)
°
UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
UCQ-12/8.3-D48 Efficiency and Power Dissipation @25˚ C
100
20
9
8
7
6
5
95
90
85
18
16
14
12
10
8
V
IN = 75V
80
75
70
65
60
55
50
V
IN = 48V
400 LFM
4
3
2
1
0
V
IN = 36V
300 LFM
200 LFM
6
100 LFM
4
Power Dissipation
IN = 48V
V
2
0
8.3
0.8
1.6
2.4
3.2
4
4.8
5.6
6.4
7.2
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
°
Load Current (Amps)
UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, longitudinal airflow)
10
9
8
100 LFM
200 LFM
7
300 LFM
400 LFM
6
5
4
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
°
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 17 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
UCQ-15/6.7-D48 Efficiency and Power Dissipation @Ta = 25˚ C
100
15
14
13
12
11
10
9
95
90
85
6.5
100 LFM
200 LFM
300 LFM
V
IN = 75V
80
75
70
65
60
55
50
400 LFM
5.5
4.5
3.5
VIN = 48V
8
7
VIN = 36V
6
5
4
Power Dissipation
3
V
IN = 48V
2
1
30
35
40
45
50
55
60
65
70
75
80
85
1.2
1.7 2.2
2.7
3.2
3.7 4.2
4.7
5.2
5.7 6.2
6.7
Ambient Temperature ( C)
°
Load Current (Amps)
UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, airflow is from Vin to Vout)
6.5
100 LFM
5.5
4.5
3.5
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature ( C)
°
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 18 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TYPICAL PERFORMANCE CURVES
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ꢀ6). ꢁ ꢂꢃ6ꢄ )/54 ꢁ ꢌꢈ! RESISTIVEꢄ OUTPUT CAPS ꢊ§& CERAMIC \\ ꢊꢈ§& TANTALUMꢉ
6/54
ꢊ6ꢋDIV
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ꢍ6ꢋDIV
ꢍMSECꢋDIV
ꢍ§SECꢋDIV
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 19 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS
UCQ with Optional Baseplate
0.40
(10.2)
2.30 (58.4)
A
2.30 (58.4)
A
1.860 (47.2)
A
PINS 1-3, 5-7:
0.040Ø 0.002 (1.016 0.05)
PINS 4, 8:
0.015 minimum
clearance between
standoffs and
#M3 THD. X 0.15 DEEP
TYPICAL 4 PL.
0.18
(4.6)
0.062Ø 0.002 (1.575 0.05)
highest component
SCREW LENGTH MUST
NOT GO THROUGH BASEPLATE
2.00 (50.8)
A
4
1
2
3
0.50
(12.7)
5
6
7
8
0.600
(15.2)
Case C67
0.300
(7.6)
BOTTOM VIEW
PINS 1-3, 5-7:
0.040Ø 0.002 (1.016 0.05)
PINS 4, 8:
0.600 (15.24)
4 EQ. SP.
0.18
(4.6)
0.062Ø 0.002 (1.575 0.05)
Dimensions are in inches (mm shown for ref. only).
Component locations may vary between units.
Third Angle Projection
DOSA-Compatible I/O Connections
Pin
1
Function P32
−Input*
Pin
5
Function P32
−Sense
Standard pin length is shown. Please refer to the Part
Number Structure for special order pin lengths.
2
Remote On/Off
+Input*
6
Output Trim
+Sense
3
7
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
4
−Output
8
+Output
*
These converters are pin-for-pin/plug-compatible to competitive
units. Other units may use different pin numbering or alternate
outline views. When laying out your PC board, follow the pin
.XXX 0.010 (0.25)
Angles 2ꢀ
Components are shown for reference only.
FUNCTION. DOSA designates Pin 1 as +Input and Pin 3 as -Input.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 20 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
TECHNICAL NOTES
Input Fusing
I/O Filtering, Input Ripple Current, and Output Noise
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL UCQ series DC/DC converters, we recommend the
use of a fast blow fuse, installed in the ungrounded input supply line with a
typical value about twice the maximum input current, calculated at low line
with the converter’s minimum efficiency.
All models in the UCQ Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures. External input capaci-
tors (CIN in Figure 2) serve primarily as energy-storage elements, minimiz-
ing line voltage variations caused by transient IR drops in conductors from
backplane to the DC/DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of DC/DC converters requires that dc voltage sources have
low ac impedance as highly inductive source impedance can affect system sta-
bility. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the convert-
ers must be installed in compliance with the requirements of the end- use
safety standard, i.e. IEC/EN/UL60950-1.
TO
Input Reverse-Polarity Protection
CURRENT
PROBE
OSCILLOSCOPE
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropriately fused, it
could cause permanent damage to the converter.
3
1
+INPUT
–INPUT
LBUS
+
V
IN
CBUS
CIN
–
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
C
IN = 33μF, ESR < 700m: @ 100kHz
BUS = 220μF, ESR < 100mW @ 100kHz
C
L
BUS = 12μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using filter-
ing techniques, the simplest of which is the installation of additional external
output capacitors. They function as true filter elements and should be selected
for bulk capacitance, low ESR and appropriate frequency response.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final value of the input voltage as it appears at the
converter. The UCQ Series implements a soft start circuit to limit the duty cycle
of its PWM controller at power up, thereby limiting the input inrush current.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line voltage
and source impedance, as well as particular load and layout conditions.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off
Control to VOUT start-up time is also governed by the internal soft start circuitry
and external load capacitance. The difference in start up time from VIN to VOUT
and from On/Off Control to VOUT is therefore insignificant.
In Figure 3, the two copper strips simulate real-world PCB impedances
between the power supply and its load. In order to minimize measurement
errors, scope measurements should be made using BNC connectors, or the
probe ground should be less than ½ inch and soldered directly to the fixture.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. Designers will normally use the –Output (pin 4) as the
ground/return of the load circuit. You can however, use the +Output (pin 8) as
ground/return to effectively reverse the output polarity.
Input Source Impedance
The input of UCQ converters must be driven from a low ac-impedance source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC/DC converter.
Minimum Output Loading Requirements
UCQ converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 21 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
Remote Sense
7
8
COPPER STRIP
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation
the user should connect the +Sense to +VOUT and –Sense to –VOUT at the DC/
DC converter pins. UCQ series converters employ a sense feature to provide
point of use regulation, thereby overcoming moderate IR drops in PCB conduc-
tors 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.
+SENSE
+OUTPUT
RLOAD
SCOPE
C1
C2
4
5
–OUTPUT
–SENSE
COPPER STRIP
C1 = 1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)] d 10%VOUT
Figure 3. Measuring Output Ripple/Noise (PARD)
In cables and discrete wiring applications, twisted pair or other techniques
should be used. Output over-voltage protection is monitored at the output volt-
age pin, not the Sense pin. Therefore, excessive voltage differences between
VOUT and Sense in conjunction with trim adjustment of the output voltage can
cause the over-voltage protection circuitry to activate (see Performance Speci-
fications for over-voltage limits). Power derating is based on maximum output
current and voltage at the converter’s output pins. Use of trim and sense func-
tions can cause output voltages to increase, thereby increasing output power
beyond the converter’s specified rating, or cause output voltages to climb into
the output over-voltage region. Therefore, the designer must ensure:
Thermal Shutdown
The UCQ converters are equipped with thermal-shutdown circuitry. If environ-
mental conditions cause the temperature of the DC/DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Specifications.
Output Over-Voltage Protection
The UCQ output voltage is monitored for an over-voltage condition using a com-
parator. The signal is optically coupled to the primary side and if the output volt-
age rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the over-voltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
(VOUT at pins) x (IOUT) d rated output power
#ONTACT AND 0#" RESISTANCE
LOSSES DUE TO )2 DROPS
ꢃ
ꢊ
ꢎ/54054
n).054
)/54
ꢅ
ꢎ3%.3%
Current Limiting
3ENSE #URRENT
ꢍ
As soon as the output current increases to approximately 130% of its rated
value, the DC/DC converter will go into a current-limiting mode. In this condi-
tion, the output voltage will decrease proportionately with increases in output
current, thereby maintaining somewhat constant power dissipation. This is
commonly referred to as power limiting. Current limit inception is defined
as the point at which the full-power output voltage falls below the specified
tolerance. See Performance/Functional Specifications. If the load current, being
drawn from the converter, is significant enough, the unit will go into a short
circuit condition as described below.
/.ꢋ/&&
#/.42/,
ꢏ
ꢆ
42)-
n3%.3%
,/!$
3ENSE 2ETURN
)/54 2ETURN
ꢌ
ꢂ
ꢎ).054
n/54054
#ONTACT AND 0#" RESISTANCE
LOSSES DUE TO )2 DROPS
Figure 4. Remote Sense Circuit Configuration
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low, the mag-
netically coupled voltage used to develop primary side voltages will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart causing the output voltage to begin ramping to their appropri-
ate value. If the short-circuit condition persists, another shutdown cycle will be
initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling
reduces the average output current, thereby preventing internal temperatures
from rising to excessive levels. The UCQ Series is capable of enduring an
indefinite short circuit output condition.
Trimming Output Voltage
UCQ converters have a trim capability (pin 6) that enables users to adjust the
output voltage (refer to the trim equations and trim graphs that follow). Adjust-
ments to the output voltage can be accomplished via a trim pot (Figure 5) or
a single fixed resistor as shown in Figures 6 and 7. A single fixed resistor can
increase or decrease the output voltage depending on its connection. Resistors
should be located close to the converter and have TCR’s less than 100ppm/°C
to minimize sensitivity to changes in temperature. If the trim function is not
used, leave the trim pin open.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 22 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7)
will increase the output voltage. A resistor connected from the Trim Pin (pin 6)
to the –Sense (pin 5) will decrease the output voltage.
ꢃ
ꢊ
ꢍ
ꢎ/54054
n).054
ꢅ
ꢏ
ꢆ
ꢂ
ꢎ3%.3%
42)-
Trim adjustments greater than the specified range can have an adverse
affect on the converter’s performance and are not recommended. Excessive
voltage differences between VOUT and Sense, in conjunction with trim adjust-
ment of the output voltage, can cause the over-voltage protection circuitry to
activate (see Performance Specifications for over-voltage limits). Temperature/
power derating is based on maximum output current and voltage at the
converter’s output pins. Use of the trim and sense functions can cause output
voltages to increase, thereby increasing output power beyond the converter’s
specified rating, or cause output voltages to climb into the output over-voltage
region. Therefore:
/.ꢋ/&&
#/.42/,
,/!$
242)- $/7.
n3%.3%
n/54054
ꢌ
ꢎ).054
Figure 7.Trim Connections To Decrease Output Voltages Using Fixed Resistors
(VOUT at pins) x (IOUT) t rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be suscep-
tible to noise pickup when connected to long conductors in noisy environments.
ꢃ
ꢊ
ꢎ/54054
n).054
ꢅ
ꢎ3%.3%
Trim Equations
(For all models except the UCQ-1.2/40-D24 and -1.2/30-D48)
ꢆꢐꢍꢍ
452.3
ꢏ
ꢆ
ꢂ
ꢍ
ꢌ
/.ꢋ/&&
#/.42/,
42)-
n3%.3%
,/!$
Trim Down
Trim Up
Connect trim resistor between
Connect trim resistor between
trim pin and −Sense
trim pin and +Sense
ꢎ).054
5.11 × VNOM × (1+')
1.225 × '
5.11
'
− 5.11
n/54054
R
TrimDn (k Ω) =
RTrimUp (k Ω) =
− 10.22
− 10.22
'
Figure 5.Trim Connections Using A Trimpot
Where,
' = | (VNOM − VOUT) / VNOM |
VNOM is the nominal, untrimmed output voltage.
VOUT is the desired new output voltage.
ꢃ
ꢊ
ꢎ/54054
n).054
ꢅ
ꢏ
ꢆ
ꢂ
ꢎ3%.3%
42)-
Do not exceed the specified trim range or maximum power ratings
when adjusting trim. Use 1% precision resistors mounted close
to the converter on short leads.
ꢍ
ꢌ
/.ꢋ/&&
#/.42/,
,/!$
242)- 50
(For the UCQ-1.2/40-D24 and -1.2/30-D48)
n3%.3%
n/54054
Trim Down
Trim Up
Connect trim resistor between
Connect trim resistor between
ꢎ).054
trim pin and −Sense
trim pin and +Sense
5.11 × VNOM × (1+')
5.11
2' − 2
Figure 6.Trim Connections To Increase Output Voltages Using Fixed Resistors
R
TrimDn (k Ω) =
RTrimUp (k Ω) =
1.225 × '
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 23 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC/DC Converters
On/Off Control
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate). The drive circuit should be able to sink appropriate current (see
Performance Specifications) when activated and withstand appropriate voltage
when deactivated. Applying an external voltage to pin 2 when no input power is
applied to the converter can cause permanent damage to the converter.
The input-side, remote On/Off Control function (pin 2) can be ordered to operate
with either polarity:
Positive (no suffix) polarity models are enabled when pin 2 is left open (or
is pulled high, applying +3.5V to +13.5V with respect to –Input, pin 1) as per
Figure 8. Positive-polarity devices are disabled when pin 2 is pulled low (0 to
0.8V with respect to –Input).
Negative (“N” suffix) polarity devices are off when pin 2 is left open (or
pulled high, applying +3.5V to +13.5V), and on when pin 2 is pulled low (0 to
1V) with respect to –Input as shown in Figure 9.
+INPUT
3
+INPUT
3
2
+VCC
+Vcc
13V CIRCUIT
2
ON/OFF
CONTROL
ON/OFF
CONTROL
5V CIRCUIT
1
–INPUT
1
–INPUT
Figure 8. Driving the Negative Polarity On/Off Control Pin
(simplified circuit)
Figure 9. Driving the Negative Polarity On/Off Control Pin
(simplified circuit)
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica-
tions 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
Maximum Solder Dwell Time
270° C.
Maximum Pot Temperature
250° C.
7 seconds Maximum Solder Dwell Time
6 seconds
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
© 2012 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_UCQ Models.B20 Page 24 of 24
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