UCQ-5/20-D48NB-C

Single Output UCQ Models
www.murata-ps.com
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
Typical units
FEATURES
PRODUCT OVERVIEW

Standard quarter-brick package/pinout
For applications requiring improved electrical and
thermal performance at reduced cost, consider
DATEL’s new UCQ series “quarter brick” DC-DC
power converters. These compact units measure
just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm)
and fit the industry-standard footprint.
Available outputs range between 1.2V @ 30 Amps
to 15V @ 6.7 Amps and accept a wide input range.
The UCQ’s interleaved, synchronous-rectifier
topology offers high efficiency (up to 93%), tight
line and load regulation, low noise and fast step
response. A single-board optimized open-frame
design contributes to impressive thermal operation. UCQ’s will operate up to +70°C and 100 LFM
airflow with no derating.

Low cost; Low profile, 0.4" (10.2mm)

24V or 48V nominal input

Outputs: 1.2V to 15V

Interleaved synchronous-rectifier topology
• Ultra high efficiency
• No output reverse conduction

Outstanding thermal performance

On/off control, trim & sense functions

Fully isolated, 2250Vdc (BASIC)

Output overvoltage protection

Fully I/O protected; Thermal shutdown
The UCQ’s feature full isolation to 2250Vdc
meeting BASIC insulation requirements of
UL/EN/IEC 60950-1. Input filters reduce propagated switching noise back to input sources. Also
included is a remote On/Off switch control (with
positive or negative logic), output trim adjustable
over nominal and output sense functions to reduce
power lead losses. Extensive protection items
avoid damage from out of limit voltages, currents
and temperatures. Protection faults automatically
recover using the hiccup technique. Besides safety
testing to 60950-1, certifications for the UCQ include application for EMC compliance (to EN55022/
CISPR22 with filter), qualification testing.

Designed to meet UL/EN/IEC60950-1
safety approvals
+SENSE
(7)
+VOUT
(8)
+VIN
(1)
SWITCH
CONTROL
–VOUT
(4)
–VIN
(3)
–SENSE
(5)
PWM
CONTROLLER
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
REMOTE
ON/OFF
CONTROL*
(2)
OPTO
ISOLATION
REFERENCE &
ERROR AMP
VOUT
TRIM
(6)
* Can be ordered with positive (standard) or negative (optional) polarity.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
Typical topology may vary between units.
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MDC_UCQ Models.E01 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
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
Input
R/N (mVp-p)
IOUT Power
VOUT
(Volts) (Amps) (Watts) Typ. Max.
1.2
1.2
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
5
5
5
12
15
40
30
25
40
30
40
40
30
35
20
30
40
20
20
25
8.3
6.7
48
36
37.5
60
54
72
100
75
115.5
66
99
132
100
100
125
99.6
100.5
50
50
50
80
50
80
50
80
50
50
60
50
35
50
100
100
100
80
100
100
100
120
100
120
80
80
100
60
55
100
150
150
Regulation (Max.) ➁
Line
Load
VIN Nom.
(Volts)
IIN full
Range
IIN no
load
(Volts) load (mA) (Amps)
Please contact Murata Power Solutions for further information.
±0.125%
±0.25%
48
36-75
30
0.90
±0.125%
±0.25%
48
36-75
50
0.94
±0.125%
±0.25%
48
36-75
50
1.45
±0.125%
±0.25%
48
36-75
45
1.31
±0.1%
±0.2%
48
36-75
30
1.70
±0.125%
±0.25%
24
18-36
120
4.96
±0.125%
±0.25%
48
36-75
50
1.80
±0.25%
±0.25%
24
18-36
130
5.41
±0.125%
±0.25%
48
36-75
50
1.53
±0.125%
±0.25%
48
36-75
50
2.3
±0.1%
±0.2%
48
36-75
30
3.06
±0.125%
±0.25%
24
18-36
160
4.55
±0.125%
±0.25%
48
36-75
80
2.26
±0.125%
±0.25%
48
36-75
30
2.89
±0.125%
±0.25%
48
36-75
80
2.28
±0.125%
±0.25%
48
36-75
100
2.28
Efficiency
Min.
Typ.
81%
81%
85%
83%
86%
82%
85%
87%
88.5%
89.5%
89%
88%
89%
88%
90%
90%
83%
83%
86%
86%
88%
84%
87%
89%
90%
91%
90%
91.5%
92%
90%
91%
92%
As of September 2014, ONLY the following part numbers will be available: UCQ-3.3/30-D48N-C; UCQ-3.3/30-D48NB-C;
UCQ-5/20-D48N-C; UCQ-5/20-D48NB-C; UCQ-5/25-D48N-C; UCQ-5/25-D48NB-C; UCQ-12/8.3-D48N-C;
UCQ-12/8.3-D48NB-C
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
Output
Configuration:
Unipolar,
single output
U CQ - 3.3 / 30 - D48 N B
Quarter-Brick Package
Nominal Output Voltage
Maximum Rated Output :
Current in Amps
Input Voltage Range:
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
H Lx - C
RoHS Hazardous Materials compliance
C = RoHS-6, standard (does not claim EU RoHS exemption 7B–lead in solder)
Y = RoHS-5 (with lead), optional, special order
Pin length option
Blank = standard pin length 0.180 in. (4.6 mm)
L1 = 0.110 in. (2.79 mm)*
L2 = 0.145 in. (3.68 mm)*
Conformal coating (optional)
Blank = no coating, standard
H = coating added, optional special order
Baseplate (optional)
Blank = No baseplate, standard
B = Baseplate installed, optional special order
*Special quantity order is required;
no sample quantities available.
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
On/Off Control Logic
P = Positive logic (standard for D24, optional for D48)
N = Negative logic (standard for D48, optional for D24)
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MDC_UCQ Models.E01 Page 2 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Input
Input voltage range
See ordering guide.
Start-up threshold, Volts
34
34
34
34
34
Undervoltage
shutdown, V
33
32
32.5
32.5
32
1.74
2.30
Pi-type
Pi-type
Overvoltage shutdown
none
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent
Input Current
Full load conditions
See ordering guide.
2
Inrush transient, A sec
0.05
Output short circuit, mA
50-200, model dependent
Low line (VIN = min.),
Amps
1.23
1.26
1.96
Standby mode, mA
(Off, UV, OT shutdown)
Internal input filter type
1-10, model dependent
Pi-type
L-C
Pi-type
Reverse polarity
protection
None, install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +0.8V
ON = Open or +3.5 to +13.5V max
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
Current, mA
1
Output
Voltage output range
See ordering guide.
±1% of VNOM., (50% load)
Voltage output accuracy
Adjustment range,
% of VNOM.
±10%
−20 + 10
±10%
Minimum loading
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
See ordering guide.
Efficiency
See ordering guide.
➀
±10%
4,700
10,000
±0.02% of VOUT range per °C
Temperature coefficient
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
resistive load
±10%
1,000
10,000
10,000
Specs are typical unless noted.
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MDC_UCQ Models.E01 Page 3 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Input
Input voltage range
Start-up threshold, Volts
Undervoltage
shutdown, V
See ordering guide.
16.8
34
17
35
35
15
32
15
34
34
2.04
3.02
Pi
Pi
Overvoltage shutdown
none
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent
Input Current
Full load conditions
See ordering guide.
2
Inrush transient, A sec
0.05
Output short circuit, mA
50-200, model dependent
Low line (VIN = min.),
Amps
6.69
2.39
7.21
Standby mode, mA
(Off, UV, OT shutdown)
Internal input filter type
1-10, model dependent
Pi
L-C
L-C
Reverse polarity
protection
None, install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +0.8V
ON = Open or +3.5 to +13.5V max
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
Current, mA
1
Output
Voltage output range
See ordering guide.
±1% of VNOM., (50% load)
Voltage output accuracy
Adjustment range,
% of VNOM.
−20 + 10
−20 + 10
±10%
±0.02% of VOUT range per °C
Temperature coefficient
Minimum loading
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
See ordering guide.
Efficiency
See ordering guide.
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
resistive load
−10 to + 10%
10,000
10,000
10,000
10,000
10,000
➀ Specs are typical unless noted.
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MDC_UCQ Models.E01 Page 4 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-3.3/40-D48
UCQ-5/20-D24
UCQ-5/20-D48
33
17
35
31.5
16
34
UCQ-5/25-D48
UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
35
35
34
34
34
31.5
Input
Input voltage range
Start-up threshold, Volts
Undervoltage
shutdown, V
See ordering guide
Overvoltage shutdown
none
Reflected (back) ripple
current, mA pk-pk
10-30, model dependent.
60 max.
Input Current
Full load conditions
2
See ordering guide.
Inrush transient, A sec
0.1
0.05
0.03
Output short circuit, mA
1200
50-200, model dependent
120
Low line (VIN = min.),
Amps
4.12
6.04
3.02
3.82
Standby mode, mA
(Off, UV, OT shutdown)
Internal input filter type
3.04
3.03
L-C
Pi
1-10, model dependent
Pi
L-C
L-C
Reverse polarity
protection
L-C
None, install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +0.8V
ON = Open or +3.5 to +13.5V max
OFF = Ground pin or to +1V.
ON = Open or +2.5 to +13.5V
Negative logic
(N model suffix)
OFF = Open or +3.5 to +13.5V
ON = Ground pin to +0.8V max
OFF = Open or +2.5 to +13.5V
ON = Ground pin or to +1V.
Current, mA
1
Output
Voltage output range
See ordering guide.
±1% of VNOM., (50% load)
Voltage output accuracy
Adjustment range,
% of VNOM.
−10 to + 10%
±0.02% of VOUT range per °C.
Temperature coefficient
Minimum loading
No minimum loading.
Remote sense
compensation
+10%
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
See ordering guide.
Efficiency
See ordering guide.
Maximum capacitive
loading, μF low ESR
<0.02Ω max.,
resistive load
➀
10,000
10,000
10,000
10,000
1,000
1000
Specs are typical unless noted.
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MDC_UCQ Models.E01 Page 5 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Isolation Voltage
Input to Output,
Volts min.
2250
Input to baseplate,
Volts min.
1500
Baseplate to output,
Volts min.
1500
Isolation resistance, MΩ
10-100, model dependent
Isolation capacitance, pF
1000
Isolation safety rating
Basic insulation
Miscellaneous
Current limit inception
(98% of VOUT, after
warmup), Amps
35
Short circuit protection
method
35
49
35
49
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
5
Short circuit duration
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
1.8
1.8
1.95
2.7 V max
2.2
Dynamic characteristics
Dynamic load response 200 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
440 ± 40
400 ± 40
400
380 ±40
2M hours
2.1M hours
2.2M hours
2M hours
2.1M hours
Environmental
Calculated MTBF
Operating temperature
range, °C
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +85, with derating
−40 to +120, model dependent
Storage temperature
range, °C
−55 to +125
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
➀
To +85°C/85%, non-condensing
Specs are typical unless noted.
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MDC_UCQ Models.E01 Page 6 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Isolation Voltage
Input to Output,
Volts min.
2250
Input to baseplate,
Volts min.
1500
Baseplate to output,
Volts min.
1500
Isolation resistance, MΩ
10-100, model dependent
Isolation capacitance, pF
1000
Isolation safety rating
Basic insulation
Miscellaneous
Current limit inception
(98% of VOUT, after
warmup), Amps
46
Short circuit protection
method
37
41
24
35
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
5
Short circuit duration
12
5
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
2.95
2.95
4
4.6
4
Dynamic characteristics
Dynamic load response 200 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
2.1M hours
2.2M hours
1.7M hours
1.8M hours
1.7M hours
Environmental
Calculated MTBF
Operating temperature
range, °C
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +85, with derating
−40 to +120, model dependent
Storage temperature
range, °C
−55 to +125
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
➀
To +85°C/85%, non-condensing
Specs are typical unless noted.
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MDC_UCQ Models.E01 Page 7 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-3.3/40-D48
UCQ-5/20-D24
UCQ-5/20-D48
UCQ-5/25-D48
UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
10
9
Isolation Voltage
Input to Output,
Volts min.
2250
Input to baseplate,
Volts min.
1500
Baseplate to output,
Volts min.
1500
Isolation resistance, MΩ
10-100, model dependent
Isolation capacitance, pF
1000
Isolation safety rating
Basic insulation
Miscellaneous
Current limit inception
(98% of VOUT, after
warmup), Amps
49
26
Short circuit protection
method
22
27
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current,
Amps
15
5
5
Short circuit duration
5
TBD
2
Continuous, output shorted to ground. No damage.
Overvoltage protection,
Volts (via magnetic
feedback)
4.25
6.25
TBD
6.2
14.4
18
Dynamic characteristics
Dynamic load response 50 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.
360 ± 20
400 ± 24
315 ± 30
315 ± 30
330 ± 40
300 ± 30 KHz
2.2M hours
2.2M hours
TBD
1.7M hours
1.8M hours
TBD
Switching frequency, KHz
Environmental
Calculated MTBF
Operating temperature
range, °C.
See Derating curves.
Operating case
temperature, °C
(no derating)
−40 to +85, with derating
−40 to +120, model dependent
Storage temperature
range, °C
−55 to +125
Thermal protection/
shutdown, °C
110-125, model dependent
Relative humidity
➀
−40 to +110
To +85°C/85%, non-condensing
Specs are typical unless noted.
www.murata-ps.com/support
MDC_UCQ Models.E01 Page 8 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-1.8/40-D48
Physical
Outline dimensions
See mechanical specs.
Pin material
Copper alloy
Pin diameter
0.040/0.062 inches (1.016/1.575 mm)
Pin finish
Nickel underplate with gold overplate
Weight, ounces
0.9
1.06
0.9
0.9
1.23
Weight, grams
25
30
25
25
35
Electromagnetic
interference
Designed to meet EN55022/CISPR22 (External filter required)
Safety
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 UCQ-3.3/20-D48 UCQ-3.3/30-D48
Physical
Outline dimensions
See mechanical specs.
Pin material
Copper alloy
Pin diameter
0.040/0.062 inches (1.016/1.575 mm)
Pin finish
Nickel underplate with gold overplate
Weight, ounces
1.06
1.06
1.06
0.7
1.06
Weight, grams
30
30
30
20
30
Electromagnetic
interference
Designed to meet EN55022/CISPR22 (External filter required)
Safety
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
UCQ-3.3/40-D48
UCQ-5/20-D24
UCQ-5/20-D48
UCQ-5/25-D48
UCQ-12/8.3-D48
UCQ-15/6.7-D48N-C
Physical
Outline dimensions
See mechanical specs.
Pin material
Copper alloy
Pin diameter
0.040/0.062 inches (1.016/1.575 mm)
Pin finish
Nickel underplate with gold overplate
Weight, ounces
1.25
1.06
1.06
1.06
1.13
1.034
Weight, grams
35.5
30
30
30
32
29.3
Electromagnetic
interference
Safety
➀
Designed to meet EN55022/CISPR22 (External filter required)
Designed to meet UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
Specs are typical unless noted.
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MDC_UCQ Models.E01 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 connected at the converter to its respective Vout pin.
Product Adaptations
Murata Power Solutions offers several variations of our core product family.
These products are available under scheduled quantity orders and may also
include separate manufacturing documentation from a mutually agreeable
Product Specification. Since these product adaptations largely share a common
parts list and similar specifications and test methods with their root products,
they are provided at excellent costs and delivery. Please contact Murata Power
Solutions for details.
As of this date, the following products are available:
UCQ-1.2/30-D48NHL2-Y
These models are all negative On/Off logic, no baseplate, conformal coating
added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with
lead).
UCQ-3.3/30-D48NBHL2-Y
UCQ-3.3/40-D48NBHL2-Y
These models are all negative On/Off logic, baseplate installed, conformal
coating added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with lead).
UCQ-1.8/30-D48NHL2-Y
Absolute Maximum Ratings
UCQ-1.8/40-D48NHL2-Y
UCQ-2.5/30-D48NHL2-Y
UCQ-2.5/40-D48NHL2-Y
UCQ-5/20-D48NHL2-Y
UCQ-12/8.3-D48NHL2-Y
Input Voltage
Continuous
Transient (100msec)
24V Models
0 to +36 Volts
+50 Volts
On/Off Control
Input Reverse Polarity Protection
Output Current
0V min. to +13.5V max.
See Fuse section
Current-limited. Devices can withstand
sustained short circuit without damage.
–40 to +100°C (with derating)
–55 to +125°C
Operating Temperature
Storage Temperature
48V Models
0 to +75 Volts
+100 Volts
These are stress ratings. Exposure of devices to greater than any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied, nor recommended.
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MDC_UCQ Models.E01 Page 10 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-1.2/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
UCQ-1.2/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
95
35
90
85
30
Output Current (Amps)
Efficiency (%)
80
75
70
VIN = 36V
65
VIN = 48V
VIN = 75V
60
55
25
20
400 LFM
300 LFM
15
200 LFM
100 LFM
10
50
5
45
40
3
6
9
12
15
18
21
24
27
75
0
30
30
35
40
45
Load Current (Amps)
50
55
60
65
70
75
80
65
70
75
80
65
70
75
80
Ambient Temperature (°C)
UCQ-1.5/25-D48 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-1.5/25-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
90
30
88
86
84
25
Output Current (Amps)
Efficiency (%)
82
80
78
VIN = 75V
76
74
VIN = 48V
72
VIN = 36V
70
68
20
15
10
400 LFM
300 LFM
66
200 LFM
5
64
100 LFM
62
60
3
4
5
6
7
8
9
0
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
30
35
40
45
Load Current (Amps)
50
55
60
Ambient Temperature (°C)
UCQ-1.8/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-1.8/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 48V (at sea level), longitudinal airflow
90
32
88
30
84
Output Current (Amps)
Efficiency (%)
86
VIN = 36V
82
VIN = 48V
80
VIN = 75V
78
76
28
26
24
22
400 LFM
74
300 LFM
200 LFM
20
72
100 LFM
Natural convection
70
4
6
8
10
12
14
16
18
20
Load Current (Amps)
22
24
26
28
30
18
30
35
40
45
50
55
60
Ambient Temperature (°C)
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MDC_UCQ Models.E01 Page 11 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
20
85
18
Efficiency (%)
VIN = 75V
VIN = 48V
16
75
14
VIN = 36V
70
12
65
10
60
8
55
6
50
45
40
Power Dissipation (watts)
90
80
UCQ-1.8/40-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
22
35
Output Current (Amps)
UCQ-1.8/40-D48 Efficiency and Power Dissipation @25˚ C
95
30
400 LFM
25
300 LFM
200 LFM
20
100 LFM
15
Natural Convection
10
4
5
Power Dissipation
VIN = 48V
45
2
0
40
4
8
12
16
20
24
28
32
36
40
0
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Load Current (Amps)
UCQ-2.5/30-D48 Maximum Current Temperature Derating
No baseplate, VIN = 24V (at sea level)
UCQ-2.5/30-D48 Efficiency vs Line Voltage and Load Current @25˚ C
95
35
90
85
30
Output Current (Amps)
Efficiency (%)
80
75
VIN = 75V
70
VIN = 48V
65
VIN = 36V
60
55
25
20
15
400 LFM
10
300 LFM
50
200 LFM
5
45
40
1
3
6
9
12
15
18
21
24
27
100 LFM
0
30
30
35
40
45
Load Current (Amps)
50
55
60
65
70
75
80
65
70
75
80
Ambient Temperature (°C)
UCQ-2.5/40-D24 Efficiency vs Line Voltage and Load Current @25˚ C
UCQ-2.5/40-D24 Maximum Current Temperature Derating
No baseplate, VIN = 24V (at sea level)
95
35
90
30
VIN = 24V
80
Output Current (Amps)
Efficiency (%)
85
VIN = 18V
75
VIN = 35V
70
65
60
25
20
15
10
400 LFM
300 LFM
5
55
200 LFM
100 LFM
50
3
6
9
12
15
18
21
24
27
30
33
36
39 40
0
30
35
40
45
50
55
60
Load Current (Amps)
Ambient Temperature (°C)
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MDC_UCQ Models.E01 Page 12 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/20-D48 Efficiency vs Line Voltage and Load Current @25°C
95
UCQ-3.3/20-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, longitudinal airflow, no baseplate)
18
20
15
12
VIN = 36V
80
9
VIN = 48V
75
6
VIN = 75V
18
Output Current (Amps)
85
Power Dissipation (watts)
Efficiency (%)
90
100 LFM
16
200 LFM
14
300 LFM
400 LFM
12
70
3
Power Dissipation
VIN = 48V
65
10
0
2
5
8
11
14
17
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
20
70
75
80
85
75
80
85
Load Current (Amps)
UCQ-3.3/30-D48 Efficiency vs Line Voltage and Load Current @25°C
95
UCQ-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
15
30
85
9
VIN = 36V
VIN = 48V
80
6
VIN = 75V
Power Dissipation
VIN = 48V
75
3
28
Output Current (Amps)
12
Power Dissipation (watts)
Efficiency (%)
90
26
24
100 LFM
22
20
3
6
9
12
15
18
21
24
27
0
30
300 LFM
400 LFM
18
16
70
200 LFM
30
35
40
45
50
55
60
65
70
Ambient Temperature (°C)
Load Current (Amps)
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MDC_UCQ Models.E01 Page 13 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/35-D24 Efficiency vs Line Voltage and Load Current @25˚ C
92
90
88
Efficiency (%)
86
84
VIN = 36V
82
80
VIN = 24V
78
VIN = 18V
76
74
72
70
3
5
7
9
11
15
17
19
21
23
25
27
29
31
33
35
Load Current (Amps)
UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)
40
40
35
35
30
30
Output Current (Amps)
Output Current (Amps)
UCQ-3.3/35-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, with baseplate, airflow is from -Vin to +Vin)
25
20
400 LFM
300 LFM
15
200 LFM
100 LFM
10
25
20
400 LFM
15
300 LFM
200 LFM
10
100 LFM
Natural Convection
5
Natural Convection
5
0
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UCQ Models.E01 Page 14 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-3.3/40-D48 Efficiency and Power Dissipation @25˚ C
95
22
90
20
85
Efficiency (%)
80
VIN = 48V
16
75
14
VIN = 36V
70
12
65
10
60
8
55
6
50
Power Dissipation (watts)
18
VIN = 75V
4
Power Dissipation
VIN = 48V
45
40
4
8
12
16
20
24
28
32
2
36
40
0
Load Current (Amps)
UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, transverse airflow)
50
50
40
40
Output Current (Amps)
Output Current (Amps)
UCQ-3.3/40-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, transverse airflow)
30
400 LFM
20
300 LFM
200 LFM
100 LFM
10
30
20
400 LFM
300 LFM
200 LFM
10
Natural Convection
100 LFM
Natural Convection
0
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UCQ Models.E01 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
14
92
Efficiency (%)
10
84
VIN = 18V
80
8
VIN = 24V
76
6
VIN = 36V
72
4
Power Dissipation
VIN = 24V
68
Power Dissipation (watts)
12
88
2
64
60
3
4
5
6
7
8
0
9 10 11 12 13 14 15 16 17 18 19 20
Load Current (Amps)
UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, no baseplate, airflow is from -Vin to +Vin)
UCQ-5/20-D24 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, with baseplate, airflow is from -Vin to +Vin)
22
25
20
20
Output Current (Amps)
Output Current (Amps)
18
16
14
100 LFM
12
200 LFM
10
8
300 LFM
6
100 LFM
15
200 LFM
10
300 LFM
400 LFM
400 LFM
5
4
2
0
30
35
40
45
50
55
60
65
70
75
80
0
85
30
35
40
45
Ambient Temperature (°C)
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
75
80
85
UCQ-5/20-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from -Vin to +Vin)
UCQ-5/20-D48
Efficiency vs Line Voltage and Load Current @25°C
22
95
20
18
Output Current (Amps)
Efficiency (%)
90
85
VIN = 36V
80
VIN = 50V
16
100 LFM
14
200 LFM
12
300 LFM
10
400 LFM
8
6
VIN = 75V
75
4
2
0
30
70
4
6
8
10
12
14
16
18
20
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
Load Current (Amps)
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MDC_UCQ Models.E01 Page 16 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-5/25-D48 Efficiency and Power Dissipation @25˚ C
95
UCQ-5/25-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
18
30
90
16
75
12
10
VIN = 36V
70
8
65
6
60
4
9
11
13
15
17
19
Load Current (Amps)
21
23
95
18
90
16
14
VIN = 75V
12
VIN = 48V
75
70
10
8
VIN = 36V
65
6
50
0.8
2.4
3.2
4
4.8
5.6
45
50
55
60
65
70
75
80
85
6.4
7.2
75
80
85
8
7
6
5
400 LFM
4
300 LFM
3
200 LFM
100 LFM
2
2
1
0
8.3
0
Power Dissipation
VIN = 48V
1.6
40
9
4
60
55
35
UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
20
85
Efficiency (%)
30
Ambient Temperature (°C)
UCQ-12/8.3-D48 Efficiency and Power Dissipation @25˚ C
100
80
200 LFM
0
25
Output Current (Amps)
7
400 LFM
300 LFM
10
100 LFM
0
5
15
2
50
3
20
5
Power Dissipation
VIN = 48V
55
25
Power Dissipation (watts)
Efficiency (%)
80
VIN = 75V
Output Current (Amps)
14
VIN = 48V
Power Dissipation (watts)
85
30
35
40
45
50
55
60
65
70
Ambient Temperature (°C)
Load Current (Amps)
UCQ-12/8.3-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, longitudinal airflow)
10
Output Current (Amps)
9
8
100 LFM
200 LFM
300 LFM
400 LFM
7
6
5
4
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UCQ Models.E01 Page 17 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
UCQ-15/6.7-D48 Efficiency and Power Dissipation @Ta = 25˚ C
100
UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, no baseplate, airflow is from Vin to Vout)
15
14
95
85
11
10
VIN = 75V
80
9
VIN = 48V
75
8
7
70
VIN = 36V
6
65
5
60
4
Power Dissipation
VIN = 48V
55
50
1.2
6.5
Output Current (Amps)
12
Loss (watts)
Efficiency (%)
13
90
2.2
2.7
3.2
3.7 4.2
4.7
5.2
Load Current (Amps)
5.7
5.5
4.5
3
2
1.7
100 LFM
200 LFM
300 LFM
400 LFM
6.2
3.5
1
6.7
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
UCQ-15/6.7-D48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, with baseplate, airflow is from Vin to Vout)
Output Current (Amps)
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)
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MDC_UCQ Models.E01 Page 18 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TYPICAL PERFORMANCE CURVES
6).6RESISTIVELOADSTEPTO
M6DIV
5#1$/UTPUT4RANSIENT2ESPONSE
6).6RESISTIVELOADSTEPTO
M6DIV
5#1$/UTPUT4RANSIENT2ESPONSE
§SECDIV
§SECDIV
5#1$%NABLE/N/FF
5#1$2IPPLEAND.OISE
6).6)/54!
6).6)/54!RESISTIVEOUTPUTCAPS§&CERAMIC\\§&TANTALUM
M6DIV
6/54
6DIV
#ONTROL
0IN
6DIV
MSECDIV
§SECDIV
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MDC_UCQ Models.E01 Page 19 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
MECHANICAL SPECIFICATIONS
UCQ with Optional Baseplate
0.40
(10.2)
2.30 (58.4)
A
2.30 (58.4)
B
A
0.015 minimum
clearance between
standoffs and
highest component
2.00 (50.8)
SCREW LENGTH MUST
NOT GO THROUGH BASEPLATE
B
B
B
A
A
#M3 THD. X 0.15 DEEP
TYPICAL 4 PL.
1.03 (26.2)
PINS 1-3, 5-7:
0.040Ø ±0.002 (1.016 ±0.05)
PINS 4, 8:
0.062Ø ±0.002 (1.575 ±0.05)
0.18
(4.6)
1.45 (36.8)
B
1.860 (47.2)
5
6
2
7
1
Case C67
0.600
(15.2)
0.300
(7.6)
BOTTOM VIEW
1.45 (36.8)
4
3
0.50
(12.7)
8
0.600 (15.24)
4 EQ. SP.
PINS 1-3, 5-7:
0.040Ø ±0.002 (1.016 ±0.05)
PINS 4, 8:
0.062Ø ±0.002 (1.575 ±0.05)
0.18
(4.6)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Component locations may vary between units.
Standard pin length is shown. Please refer to the Part
Number Structure for special order pin lengths.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
DOSA-Compliant I/O Connections
Pin
1
2
3
4
Function P32
+Vin
Remote On/Off
–Vin
−Vout
Pin
5
6
7
8
Function P32
−Sense
Trim
+Sense
+Vout
Components are shown for reference only.
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MDC_UCQ Models.E01 Page 20 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL UCQ series DC-DC converters, we recommend the
use of a fast blow fuse, installed in the ungrounded input supply line with a
typical value about twice the maximum input current, calculated at low line
with the converter’s minimum efficiency.
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use
safety standard, i.e. IEC/EN/UL60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If this source is not current limited or the circuit appropriately fused, it
could cause permanent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage.
Once operating, devices will not turn off until the input voltage drops below the
Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input
is brought back up to the Start-Up Threshold. This built in hysteresis prevents
any unstable on/off situations from occurring at a single input voltage.
Start-Up Time
The VIN to VOUT Start-Up Time is the time interval between the point at which
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears at the
converter. The UCQ Series implements a soft start circuit to limit the duty cycle
of its PWM controller at power up, thereby limiting the input inrush current.
The On/Off Control to VOUT start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off
Control to VOUT start-up time is also governed by the internal soft start circuitry
and external load capacitance. The difference in start up time from VIN to VOUT
and from On/Off Control to VOUT is therefore insignificant.
Input Source Impedance
The input of UCQ converters must be driven from a low ac-impedance source.
The DC-DC’s performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in the
input traces. For optimum performance, components should be mounted close
to the DC-DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the UCQ Series are tested/specified for input reflected ripple
current and output noise using the specified external input/output components/
circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from
backplane to the DC-DC. Input caps should be selected for bulk capacitance
(at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of DC-DC converters requires that dc voltage sources have
low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific
system configuration may necessitate additional considerations.
TO
OSCILLOSCOPE
CURRENT
PROBE
+VIN
LBUS
+
VIN
1
CBUS
CIN
–
3
–VIN
CIN = 33μF, ESR < 700m: @ 100kHz
CBUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 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 filtering techniques, the simplest of which is the installation of additional external
output capacitors. They function as true filter elements and should be selected
for bulk capacitance, low ESR and appropriate frequency response.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line voltage
and source impedance, as well as particular load and layout conditions.
Floating Outputs
Since these are isolated DC-DC converters, their outputs are “floating” with
respect to their input. Designers will normally use the –Output (pin 4) as the
ground/return of the load circuit. You can however, use the +Output (pin 8) as
ground/return to effectively reverse the output polarity.
Minimum Output Loading Requirements
UCQ converters employ a synchronous-rectifier design topology and all models
regulate within spec and are stable under no-load to full load conditions.
Operation under no-load conditions however might slightly increase the output
ripple and noise.
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MDC_UCQ Models.E01 Page 21 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
+SENSE
7
8
+VOUT
C1
C2
SCOPE
RLOAD
4
–VOUT
5
–SENSE
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Remote Sense
Note: The Sense and VOUT lines are internally connected through low-value
resistors. Nevertheless, if the sense function is not used for remote regulation the user should connect the +Sense to +VOUT and –Sense to –VOUT at
the DC-DC converter pins. UCQ series converters employ a sense feature to
provide point of use regulation, thereby overcoming moderate IR drops in PCB
conductors or cabling. The remote sense lines carry very little current and
therefore require minimal cross-sectional-area conductors. The sense lines,
which are capacitively coupled to their respective output lines, are used by the
feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines
on a PCB should be run adjacent to dc signals, preferably ground.
[VOUT(+)-VOUT(–)] – [Sense(+)-Sense(–)]  10%VOUT
Figure 3. Measuring Output Ripple/Noise (PARD)
Thermal Shutdown
The UCQ converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC-DC converter to rise above
the designed operating temperature, a precision temperature sensor will power
down the unit. When the internal temperature decreases below the threshold
of the temperature sensor, the unit will self start. See Performance/Functional
Specifications.
Output Over-Voltage Protection
The UCQ output voltage is monitored for an over-voltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltage to decrease.
Following a time-out period the PWM will restart, causing the output voltage
to ramp to its appropriate value. If the fault condition persists, and the output
voltage again climbs to excessive levels, the over-voltage circuitry will initiate
another shutdown cycle. This on/off cycling is referred to as “hiccup” mode.
Current Limiting
As soon as the output current increases to approximately 130% of its rated
value, the DC-DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output
current, thereby maintaining somewhat constant power dissipation. This is
commonly referred to as power limiting. Current limit inception is defined
as the point at which the full-power output voltage falls below the specified
tolerance. See Performance/Functional Specifications. If the load current, being
drawn from the converter, is significant enough, the unit will go into a short
circuit condition as described below.
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be
initiated. This on/off cycling is referred to as “hiccup” mode. The hiccup cycling
reduces the average output current, thereby preventing internal temperatures
from rising to excessive levels. The UCQ Series is capable of enduring an
indefinite short circuit output condition.
In cables and discrete wiring applications, twisted pair or other techniques
should be used. Output over-voltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between
VOUT and Sense in conjunction with trim adjustment of the output voltage can
cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Power derating is based on maximum output
current and voltage at the converter’s output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power
beyond the converter’s specified rating, or cause output voltages to climb into
the output over-voltage region. Therefore, the designer must ensure:
(VOUT at pins) x (IOUT)  rated output power
1
+VOUT
+VIN
+SENSE
2
Contact and PCB resistance
losses due to IR drops
8
7
IOUT
Sense Current
ON/OFF
CONTROL
TRIM
6
LOAD
Sense Return
–SENSE
3
5
IOUT Return
–VIN
–VOUT
4
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Configuration
Trimming Output Voltage
UCQ converters have a trim capability (pin 6) that enables users to adjust the
output voltage (refer to the trim equations and trim graphs that follow). Adjustments to the output voltage can be accomplished via a trim pot (Figure 5) or
a single fixed resistor as shown in Figures 6 and 7. A single fixed resistor can
increase or decrease the output voltage depending on its connection. Resistors
should be located close to the converter and have TCR’s less than 100ppm/°C
to minimize sensitivity to changes in temperature. If the trim function is not
used, leave the trim pin open.
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MDC_UCQ Models.E01 Page 22 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7)
will increase the output voltage. A resistor connected from the Trim Pin (pin 6)
to the –Sense (pin 5) will decrease the output voltage.
Trim adjustments greater than the specified range can have an adverse
affect on the converter’s performance and are not recommended. Excessive
voltage differences between VOUT and Sense, in conjunction with trim adjustment of the output voltage, can cause the over-voltage protection circuitry to
activate (see Performance Specifications for over-voltage limits). Temperature/
power derating is based on maximum output current and voltage at the
converter’s output pins. Use of the trim and sense functions can cause output
voltages to increase, thereby increasing output power beyond the converter’s
specified rating, or cause output voltages to climb into the output over-voltage
region. Therefore:
1
+VOUT
+VIN
+SENSE
2
ON/OFF
CONTROL
TRIM
7
6
LOAD
RTRIM DOWN
–SENSE
3
8
–VIN
–VOUT
5
4
Figure 7. Trim Connections To Decrease Output Voltages Using Fixed Resistors
(VOUT at pins) x (IOUT)  rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments.
In such cases, a 0.22μF capacitor between trim and –Vout can be added to
reduce this long lead effect.
1
+VOUT
+VIN
8
Trim Equations
(For all models except the UCQ-1.2/40-D24 and -1.2/30-D48)
+SENSE
2
ON/OFF
CONTROL
TRIM
–SENSE
3
–VIN
–VOUT
7
5-22
TURNS
6
LOAD
5
RTrimDn (k Ω) = 5.11 − 10.22
Δ
4
+VIN
+VOUT
RTrimUp (k Ω) = 5.11 × VNOM × (1+Δ) − 5.11 − 10.22
1.225 × Δ
Δ
Where,
Δ = | (VNOM − VOUT) / VNOM |
VNOM is the nominal, untrimmed output voltage.
VOUT is the desired new output voltage.
Figure 5. Trim Connections Using A Trimpot
1
Trim Up
Connect trim resistor between
trim pin and +Sense
Trim Down
Connect trim resistor between
trim pin and −Sense
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.
8
q
+SENSE
2
ON/OFF
CONTROL
TRIM
(For the UCQ-1.2/40-D24 and -1.2/30-D48)
6
LOAD
RTRIM UP
–SENSE
3
7
5
Trim Down
Connect trim resistor between
trim pin and −Sense
RTrimDn (k Ω) =
–VIN
–VOUT
4
5.11
2Δ − 2
Trim Up
Connect trim resistor between
trim pin and +Sense
RTrimUp (k Ω) = 5.11 × VNOM × (1+Δ)
1.225 × Δ
Figure 6. Trim Connections To Increase Output Voltages Using Fixed Resistors
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MDC_UCQ Models.E01 Page 23 of 24
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp
Isolated DC-DC Converters
On/Off Control
The input-side, remote On/Off Control function (pin 2) can be ordered to operate
with either logic type:
Positive (no suffix) logic 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-logic devices are disabled when pin 2 is pulled low (0 to 0.8V
with respect to –Input).
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate). The drive circuit should be able to sink appropriate current (see
Performance Specifications) when activated and withstand appropriate voltage
when deactivated. Applying an external voltage to pin 2 when no input power is
applied to the converter can cause permanent damage to the converter.
Negative (“N” suffix) logic 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.
+VIN
1
+VIN
+Vcc
1
+VCC
13V CIRCUIT
2
2
ON/OFF
CONTROL
3
ON/OFF
CONTROL
5V CIRCUIT
–VIN
3
Figure 8. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
–VIN
Figure 9. Driving the Negative Logic On/Off Control Pin
(simplified circuit)
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
For Sn/Pb based solders:
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_UCQ Models.E01 Page 24 of 24