UCH models_2.5-15V.D01.indd

Single Output UCH Models
www.murata-ps.com
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
PRODUCT OVERVIEW
PROD
Typical Unit
high efficiency, low noise and long-term reliThe hig
ability tthat defines Murata Power Solutions’ DC/
Converters now comes to you in the standard
DC Con
“half-brick” configuration (2.3˝ x 2.4˝ x 0.40˝).
“half-br
Our new UCH Series is certified to UL/EN609501 safety requirements (some models pending),
including each European country’s deviations. All
includin
models have BASIC insulation; guarantee 2250Vdc
out) isolation; and because they are designed
(in to ou
Class B thermal insulation, satisfy all safety
with Cla
requirements over their full operating temperatures. Construction/attach meets stringent RoHS-6
specifications.
UCH Models are designed for demanding telecom, datacom and networking applications. Their
“semi-synchronous-rectifier” design achieves
FEATURES

Standard “half-brick” configuration

Certified to UL-60950-1, CSA-C22.2 No.
60950-1, IEC\EN 60950-1, 2nd edition
(some models pending)

Fully isolated, 2250Vdc guaranteed
impressive efficiencies. Output voltages are
1.8 to 15 Volts. The input voltage range is 36 to 75
or 18 to 36 Volts. All models meet the Low Voltage
Directive (LVD).
For high reliability and affordability, Murata
Power Solutions utilizes high-speed automatic
assembly to construct the UCH’s proven SMTon-pcb designs. An optional baseplate offers full
output power at maximum temperature.
UCH’s feature input filters, input undervoltage
and overvoltage lockout, output current limiting,
short-circuit protection, and thermal shutdown.
Additionally, all devices have output trim capability
and an on/off control pin that can be ordered with
either logic type.

Output voltages: 1.8 – 15 Volts

VIN range: 36-75V or 18-36V

Full 50-150 Watt output power

Reliable SMT-on-pcb construction
 Input under and output overvoltage shutdown

Output current limiting and short-circuit
protection

On/off, VOUT trim and sense functions

Modifications and customs for OEMs

RoHS-6 construction/attach
+SENSE
(6)
+VOUT
(5)
+VIN
(4)
CASE
(2)
SWITCH
CONTROL
–VOUT
(9)
–VIN
(1)
–SENSE
(8)
PMW
CONTROLLER
REMOTE*
ON/OFF
CONTROL
(3)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
OPTO
ISOLATION
REFERENCE &
ERROR MAP
VOUT
TRIM
(7)
Typical topology is shown.
*Can be ordered with positive (standard)
or negative (optional) polarity.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
(some models pending
certification)
REG.-Nr. C457
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MDC_UCH Models.D01 Page 1 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Output
Input
R/N (mVp-p) ➁
Root Family ➀
UCH-1.8/40-D48N-C
UCH-2.5/40-D48N-C
UCH-3.3/10-D24P-C
UCH-3.3/10-D48N-C
UCH-3.3/15-D48N-C
UCH-3.3/35-D24P-C
UCH-3.3/30-D48N-C
UCH-5/10-D48N-C
UCH-5/20-D24P-C
UCH-5/30-D48N-C
UCH-12/4.2-D48N-C
UCH-12/12.5-D48N-C
UCH-15/6.7-D48N-C ➂
VOUT
IOUT Power
(Volts) (Amps) (Watts)
1.8
2.5
3.3
5
12
12
15
40
40
10
10
15
35
30
10
20
30
4.2
12.5
6.7
72
100
33
33
49.5
115.5
99
50
100
150
50.4
150
100.5
Regulation (Max.)
IIN,
IIN, full
VIN Nom. Range no load load
(Volts) (Volts) (mA) (Amps)
Typ.
Max.
Line
Load
50
100
100
±0.25%
±0.2%
150
±0.125%
±0.1%
±0.2%
±0.2%
±0.125%
±0.125%
±0.125%
±0.125%
±0.125%
±0.125%
±0.125%
150
±0.125%
50
60
50
60
80
50
70
80
150
100
±0.25%
48
48
24
48
48
24
48
48
24
36-75
36-75
18-36
36-75
36-75
18-36
36-75
36-75
18-36
48
36-75
50
50
100
90
1.72
2.34
1.54
0.77
1.16
5.41
2.29
1.17
4.6
3.43
1.16
3.37
2.28
Efficiency
Min.
Typ.
85%
87.5%
87%
87%
Package C61
Case
inches
(mm)
89%
2.4×2.28×0.40
90%
(61×57.9×10.2)
89%
90.5%
89%
91%
87.5% 90.5%
89% 92.6%
90%
92%
89%
85.5%
➀ Please refer to the full model number structure for additional ordering part numbers and options.
➁ All specifications are at nominal line voltage and full load, +25 °C. unless otherwise noted. See detailed specifications. Output capacitors are 1 µF ceramic in parallel with 10 µF electrolytic . Input cap is 22
µF, low ESR. I/O caps are necessary for our test equipment and may not be needed for your application.
➂ Pending UL and VDE certification.
As of September 2014, ONLY the following part numbers will be available: UCH-5/20-D24PB-C; UCH-12/4.2-D48N-C;
UCH-12/4.2-D48NB-C; UCH-12/12.5-D48N-C; UCH-12/12.5-D48NB-C
PART NUMBER STRUCTURE
U CH - 5 / 30 - D48 N B H LX - C
Output
Configuration:
Unipolar Single Output
Half-brick package
Nominal Output Voltage
Maximum Rated Output:
Current in Amps
Input Voltage Range:
D24 = 18-36 Volts
D48 = 36-75 Volts
RoHS Hazardous Materials Compliance
C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Y = RoHS-5 (with lead), optional, special order
Pin Length Option
Blank = Standard pin length, 0.180 inches (4.6mm)
L1 = 0.110 inches (2.79mm)
L2 = 0.145 inches (3.68mm)
*
*
Conformal Coating Option
Blank = No coating, standard
H = Coating added, optional
(built to order; contact Murata Power Solutions for MOQ and lead times.)
*
Optional Baseplate
Blank = No Baseplate, standard
B = Baseplate installed, optional quantity order
On/Off Control Logic
P = Positive logic (standard for D24, optional for D48)
N = Negative logic (standard for D48, optional for D24)
quantity order is required;
*noSpecial
sample quantities available.
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
www.murata-ps.com/support
MDC_UCH Models.D01 Page 2 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
FUNCTIONAL SPECIFICATIONS ➀
UCH-1.8/40-D48 UCH-2.5/40-D48 UCH-3.3/10-D24 UCH-3.3/10-D48 UCH-3.3/15-D48 UCH-3.3/35-D24 UCH-3.3/30-D48
Input
Input voltage range
See ordering guide
Start-up threshold, Volts
34
34
16
34
34
16
34
Undervoltage
shutdown, V
32
31
15
31
31
15
31
15
15
10
1.54
7.21
3.09
Overvoltage shutdown
Reflected (back) ripple current, mA pk-pk
none
10
20
10
15
Input Current
Full load conditions
See ordering guide.
Inrush transient, A2sec
0.05
Output short circuit, mA
Low line (VIN = min.), Amps
50
2.30
Standby mode, mA
(Off, UV, OT shutdown)
2
Internal input filter type
Pi
External recommended fast
blow fuse, Amps
10
Reverse polarity
protection
1.54
2.06
1.03
10
8
L-C
3
5
3
3
12.5
7.5
None. Install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +1V max.
ON = Open or +3.5 to +13.5V max
Negative logic
(N model suffix)
OFF = Open or +2.5V to +15V max.
ON = –0.1V to +0.8V max
Current, mA
1
Output
Voltage output range
Voltage output accuracy
Adjustment range
Temperature coefficient
over oper. temp. range
See ordering guide.
±1% of VNOM (50% load)
–10 to +10% of VNOM.
±0.02% of VOUT range per °C
Minimum loading
No minimum loading.
Remote sense
compensation 17
+10%.
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
See ordering guide.
Efficiency
See ordering guide.
Maximum capacitive loading,
Low ESR <0.02Ω max.,
resistive load, μF
10,000 max.
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MDC_UCH Models.D01 Page 3 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
UCH-5/10-D48
UCH-5/20-D24
UCH-5/30-D48
UCH-12/4.2-D48 UCH-12/12.5-D48 UCH-15/6.7-D48
Start-up threshold, Volts
34
16
35
35
35
35
Undervoltage
shutdown, V
33
15
34
33.5
33.5
33
20
20
20
4.47
3.06
Input
Input voltage range
See ordering guide.
Overvoltage shutdown
Reflected (back) ripple current, mA pk-pk
none
15
20
15
Input Current
Full load conditions
See ordering guide.
Inrush transient, A2sec
0.05
Output short circuit, mA
Low line (VIN = min.), Amps
50
1.54
6.17
4.63
Standby mode, mA
(Off, UV, OT shutdown)
4
10
4
Internal input filter type
Pi
External recommended fast
blow fuse, Amps
10
1.51
1
L-C
10
Reverse polarity
protection
7.5
Pi
L-C
10
7.5
None. Install external fuse.
Remote On/Off Control
Positive logic
(P model suffix)
OFF = Ground pin to +1V max.
ON = Open or +3.5 to +15V max
Negative logic
(N model suffix)
OFF = Open or +2.5V to +15V max.
ON = –0.1V to +0.8V max
Current, mA
1
Output
Voltage output range
See ordering guide.
Voltage output accuracy
±1% of VNOM.
Adjustment range
–10 to +10% of VNOM.
Temperature coefficient
over oper. Temp. range
±0.02% of VOUT range per °C
Minimum loading
No minimum loading.
Remote sense
compensation
+10%.
17
Ripple/noise
(20 MHz bandwidth)
See ordering guide.
Line/Load regulation
See ordering guide.
Efficiency
See ordering guide.
Maximum capacitive loading,
Low ESR <0.02Ω max.,
resistive load, μF
10,000
10,000 max.
20,000 max.
5000
10,000
1,000
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MDC_UCH Models.D01 Page 4 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
UCH-1.8/40-D48 UCH-2.5/40-D48 UCH-3.3/10-D24 UCH-3.3/10-D48 UCH-3.3/15-D48 UCH-3.3/35-D24 UCH-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
100
Isolation capacitance, pF
1000
Isolation safety rating
Basic insulation
Current limit inception (98% of
VOUT, after warmup), Amps
59 max.
49
Short circuit protection method
15
15
19
40
35
4.62 max.
4.95 max.
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current, Amps
5
Short circuit duration
Output may be shorted continuously to ground (no damage).
Overvoltage protection, Volts
(via magnetic feedback)
2.7 max.
3.75 max.
4.95 V max
Starts if external voltage is less than VNOM.
Prebiased Startup
Dynamic characteristics
Dynamic load response
(50-75-50% load step)
100 μSec to ±1% 100 μSec to ±1% 200 μSec to ±1% 200 μSec to ±1% 200 μSec to ±1% 200 μSec to ±1% 200 μSec to ±1%
of final value
of final value
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
360
420 ± 40
330 ± 40
Environmental
Calculated MTBF
1.6M hrs.
TBD
Operating ambient temperature
range, °C (with derating)
1.8M hrs.
TBD
−40 to +85 (See Derating Curves)
Operating PC board
temperature, °C
−40 to +110
Storage temperature range, °C
Thermal protection/shutdown, °C
−55 to +125
+115
+115
+120
Relative humidity
To +85°C/85%, non-condensing
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
For Sn/Pb based solders:
Maximum Preheat Temperature
115° C.
Maximum Preheat Temperature
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
105° C.
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
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MDC_UCH Models.D01 Page 5 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
UCH-5/10-D48
UCH-5/20-D24
UCH-5/30-D48
UCH-12/4.2-D48 UCH-12/12.5-D48 UCH-15/6.7-D48
Isolation Voltage
Input to Output, Volts min.
2250
Input to baseplate, Volts min.
1500
Baseplate to output, Volts min.
1500
Isolation resistance, MΩ
100
Isolation capacitance, pF
1000
Isolation safety rating
Basic insulation
Miscellaneous
Current limit inception (98% of VOUT,
after warmup), Amps
13
Short circuit protection method
26
35
5.4
7.4
Current limiting, hiccup autorestart. Remove overload for recovery.
Short circuit current, Amps
5
Short circuit duration
Overvoltage protection, Volts
(via magnetic feedback)
14.5
Output may be shorted continuously to ground (no damage).
7.75 max.
7.5 max.
Prebiased Startup
7.5
18 max.
16.8 max.
17.5
250 μSec to ±1%
of final value
250 μSec to ±1%
of final value
335 ± 35
350 ± 40
Starts if external voltage is less than VNOM.
Dynamic characteristics
Dynamic load response
(50-75-50% load step)
200 μSec to ±1%
of final value
200 μSec to ±1%
of final value
200 μSec to ±1%
of final value
250 μSec to ±1%
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
300 ± 30
330 ± 40
300 ± 30
335 ± 35
1.6M hours
TBD
1.9M hours
1.6M hours
Environmental
Calculated MTBF
Operating ambient temperature
range, °C (with derating)
−40 to +85 (See Derating Curves)
Operating PC board
temperature, °C
−40 to +110
Storage temperature range, °C
Thermal protection/shutdown, °C
Relative humidity
TBD
−55 to +125
+120
+115
To +85°C/85%, non-condensing
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MDC_UCH Models.D01 Page 6 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
UCH-1.8/40-D48 UCH-2.5/40-D48 UCH-3.3/10-D24 UCH-3.3/10-D48 UCH-3.3/15-D48 UCH-3.3/35-D24 UCH-3.3/30-D48
Physical
Outline dimensions
See mechanical specs.
Baseplate material
Aluminum
Pin material
Gold plated copper alloy with nickel underplate
Pin diameter
0.04/0.08 inches (1.016/2.032 mm)
Weight, ounces
1.68
2
Weight, grams
47
60
Electromagnetic
interference
(conducted and
radiated)
(external filter
required)
Certified to EN55022/CISPR22
Flammability
Safety
UL94V-0
Certified to UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1, 2nd edition (some models pending).
UCH-5/10-D48
UCH-5/20-D24
UCH-5/30-D48
UCH-12/4.2-D48 UCH-12/12.5-D48 UCH-15/6.7-D48
Physical
Outline dimensions
See mechanical specs.
Baseplate material
Aluminum
Pin material
Gold plated copper alloy with nickel underplate
Pin diameter
0.04/0.08 inches (1.016/2.032 mm)
Weight, ounces
2
1.73
Weight, grams
60
49
Electromagnetic
interference
(conducted and
radiated)
(external filter
required)
Certified to EN55022/CISPR22
Flammability
Safety
UL94V-0
Certified to UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1, 2nd edition (some models pending).
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MDC_UCH Models.D01 Page 7 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
Absolute Maximum Ratings
Input Voltage:
D24 Models -
On/Off Control
0-36 VDC
50 VDC
0-75 VDC
100 VDC
-0.7 V. min to +15V max.
Input Reverse-Polarity Protection
None. Install external fuse.
Output Overvoltage
Output Current
Vout nom. +20% max.
Current-limited. Devices can
withstand sustained short
circuit without damage. The
outputs are not intended to
accept appreciable reverse
current.
Device includes electronic
overtemperature shutdown
protection under normal
operation.
-55 to +125° C
See soldering specifications
D48 Models -
Volts, max. continuous
Volts, transient, 100 mSec
Volts, max. continuous
Volts, transient, 100 mSec
Overtemperature Protection
Storage Temperature
Lead 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.
Specification Notes:
(1) All models are tested and specified with external 1 µF paralleled with 10 µF output capacitors
and 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°C,
Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied for extended testing under
power.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering
is Cin=33 µF, 100V, Cbus=220 μF, 100V, 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.
(9) All models are fully operational and meet published specifications, including “cold start” at –40°C.
At full power, the package temperature of all on-board components must not exceed +128°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) The output overvoltage protection is automatic recovery. The overvoltage may occur either from
internal failure or from an external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is
removed, the converter will immediately recover. After an output overcurrent or short circuit, “hiccup”
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 resumes normal operation.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,
ground fixed conditions, Tpcboard=+25°C, full load, natural air convection.
(5) The On/Off Control is normally selected by a switch or an 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 and comply with the On/Off voltage specifications.
(6) Output current limiting begins when the output voltage degrades approximately 2% from the
selected setting.
(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) If reverse polarity is accidentally applied to the input, to ensure reverse input protection with full
output load, always connect an external input fuse in series with the +Vin input. Use approximately
twice the full input current rating with nominal input voltage.
(16) 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.
(7) The outputs are not intended to sink appreciable reverse current.
(8) Output noise may be further reduced by adding an external filter. Logic circuits with low power
voltages may have a small voltage margin between logic ZERO and logic ONE, requiring noise suppression. Use only as much output filtering as needed to achieve your noise requirements. Excessive
output capacitance can retard transient response or possibly cause instability. Low ESR ceramic
capacitors may degrade dynamic performance. Be sure to thoroughly test your system under full load
with all components installed.
(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.
CAUTION: This product is not internally fused. To comply with safety agency certifications and to
avoid injury to personnel or equipment, the user must connect an external fast-blow fuse to the input
terminals.
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MDC_UCH Models.D01 Page 8 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
TYPICAL PERFORMANCE DATA
UCH-1.8/40-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, airflow is from VIN to VOUT
UCH-1.8/40-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
95
12.1
90
11
85
9.9
8.8
VIN = 36V
7.7
75
6.6
VIN = 48V
5.5
65
Power Dissipation
(VIN = 48V)
60
4.4
55
3.3
50
2.2
45
1.1
40
4
8
12
16
20
24
28
32
36
35
30
25
400 lfm
300 lfm
20
200 lfm
100 lfm
15
0
40
10
30
35
40
45
Load Current (Amps)
95
10
40
9
38
90
7
VIN = 36V
6
80
5
VIN = 48V
Power Dissipation
(VIN = 48V)
VIN = 75V
4
3
70
Output Current (Amps)
85
Power Dissipation (Watts)
Efficiency (%)
8
60
9
12
15
18
21
24
400 lfm
100 lfm
0
24
30
40
50
70
80
5
80
4
VIN = 36V
3
VIN = 24V
VIN = 18V
Power Dissipation
(VIN = 24V)
70
2
65
1
7
Load Current (Amps)
8
9
10
Efficiency (%)
UCH-3.3/10-D48 Maximum Current Temperature Derating
vs Line Voltage and Load Current @25˚C
Power Dissipation (Watts)
Efficiency (%)
60
Ambient Temperature (°C)
85
6
85
200 lfm
27
6
5
80
300 lfm
26
90
4
75
30
1
UCH-3.3/10-D24 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
3
70
32
Load Current (Amps)
75
65
34
2
6
60
36
28
65
3
55
UCH-2.5/40-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, transverse airflow
UCH-2.5/40-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
75
50
Ambient Temperature (°C)
95
4
90
3.8
85
3.6
80
3.4
VIN = 75V
VIN = 48V
75
3.2
VIN = 36V
Power Dissipation
(VIN = 48V)
70
Power Dissipation (Watts)
VIN = 75V
70
Output Current (Amps)
40
Power Dissipation (Watts)
Efficiency (%)
80
45
3.0
65
2.8
3
4
5
6
7
8
9
10
Load Current (Amps)
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MDC_UCH Models.D01 Page 9 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
TYPICAL PERFORMANCE DATA
95
10
90
9
8
Efficiency (%)
85
VIN = 75V
80
7
VIN = 48V
75
6
70
5
VIN = 36V
65
4
Power Dissipation
(VIN = 48V)
60
Power Dissipation (Watts)
UCH-3.3/15-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
3
2
55
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Current (Amps)
UCH-3.3/35-D24 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 24V, transverse airflow
UCH-3.3/35-D24 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
95
40
18
36
12
85
10
VIN = 24V
8
80
VIN = 18V
6
Power Dissipation
(VIN = 24V)
75
6
9
12
15
18
21
24
27
30
32
28
24
20
400 lfm
16
4
70
3
Output Current (Amps)
14
VIN = 36V
Power Dissipation (Watts)
16
90
Efficiency (%)
20
300 lfm
200 lfm
2
12
0
8
33
100 lfm
30
40
Load Current (Amps)
31
10
9
30
90
7
VIN = 75V
6
80
5
VIN = 48V
4
Power Dissipation
(VIN = 48V)
3
70
2
65
1
0
60
6
9
12
15
18
Load Current (Amps)
21
24
27
30
Output Current (Amps)
85
Power Dissipation (Watts)
Efficiency (%)
8
3
70
UCH-3.3/30-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, transverse airflow
95
VIN = 36V
60
Ambient Temperature (°C)
UCH-3.3/30-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
75
50
29
28
27
100 lfm
200 lfm
26
300 lfm
25
24
23
30
40
50
60
70
80
Ambient Temperature (°C)
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MDC_UCH Models.D01 Page 10 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
TYPICAL PERFORMANCE DATA
UCH-5/20-D24 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 24V, transverse airflow
UCH-5/20-D24 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
95
20
20
18
18
14
VIN = 36V
85
12
10
VIN = 24V
80
8
VIN = 18V
6
Power Dissipation
(VIN = 24V)
Output Current (Amps)
16
Power Dissipation (Watts)
Efficiency (%)
90
4
75
16
14
100 lfm
200 lfm
300 lfm
400 lfm
12
2
0
70
3
6
9
12
15
10
30
18
40
50
Load Current (Amps)
30
90
16
26
VIN = 75V
12
85
VIN = 48V
8
80
VIN = 36V
Power Dissipation
(VIN = 48V)
75
70
9
12
15
18
21
24
27
Output Current (Amps)
20
Power Dissipation (Watts)
Efficiency (%)
95
6
18
100 lfm
4
14
0
10
30
30
40
1.26
1.68
2.1
2.52
Load Current (Amps)
2.94
3.36
3.78
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
4.2
50
60
70
80
4.5
4
Output Current (Amps)
VIN = 75V
Power Dissipation
(VIN = 48V)
0.84
400 lfm
300 lfm
UCH-12/4.2-D48 Maximum Current Temperature Derating at sea level
(VIN = 48V, airflow direction from VIN to VOUT, no baseplate)
Power Dissipation (Watts)
Efficiency (%)
VIN = 48V
200 lfm
Ambient Temperature (°C)
UCH-12/4.2-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
VIN = 36V
80
22
Load Current (Amps)
93
91
89
87
85
83
81
79
77
75
73
71
69
67
65
0.42
70
UCH-5/30-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, transverse airflow
UCH-5/30-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
3
60
Ambient Temperature (°C)
3.5
Natural Convection
3
2.5
2
1.5
1
0.5
0
30
40
50
60
70
80
85
Ambient Temperature (°C)
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MDC_UCH Models.D01 Page 11 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
TYPICAL PERFORMANCE DATA
UCH-12/12.5-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, transverse airflow
UCH-12/12.5-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
12.5
20
95
18
11.5
14
12
80
VIN = 36V
VIN = 48V
VIN = 75V
10
75
8
Power Dissipation
(VIN = 48V)
70
Output Current (Amps)
Efficiency (%)
16
85
Power Dissipation (Watts)
90
19.5
9.5
8.5
100 lfm
300 lfm
400 lfm
7.5
6
6.5
30
4
65
3
4
5
6
7
8
9
10
11
12
40
Load Current (Amps)
60
70
80
UCH-15/6.7-D48 Maximum Current Temperature Derating (at sea level)
No baseplate, VIN = 48V, transverse airflow
7
95
12
6
90
10
VIN = 75V
8
VIN = 48V
6
80
VIN = 36V
Power Dissipation
(VIN = 48V)
75
4
2
70
Output Current (Amps)
14
Power Dissipation (Watts)
100
85
50
Ambient Temperature (°C)
UCH-15/6.7-D48 Efficiency and Power Dissipation
vs Line Voltage and Load Current @25˚C
Efficiency (%)
200 lfm
5
4
3
100 lfm
2
200 lfm
300 lfm
400 lfm
1
0
65
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
0
30
40
50
60
70
80
Load Current (Amps)
Ambient Temperature (°C)
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MDC_UCH Models.D01 Page 12 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
MECHANICAL SPECIFICATIONS
2.30
(58.4)
A
User’s thermal surface and hardware
Recommended threaded insert torque
is 0.35-0.55 N-M or 3-5 in-lbs.
0.40
(10.2)
Baseplate
Do not remove
M3 x 0.50
threaded inserts
from bottom PCB
0.50
(12.7)
0.015 min. clearance
between standoffs and
highest component
0.18
(4.6)
Pin Diameters:
Pins 1-4, 6-8
Pins 5, 9
1.900
(48.26)
A
0.015 minimum
clearance between
standoffs and
highest component
0.18
(4.6)
0.040 ± 0.001 (1.016 ±0.025)
0.080 ± 0.001 (2.032 ±0.025)
0.20
(5.1)
2.30 (58.4)
1.90 (48.3)
B
1
9
2
M3 x 0.50
threaded insert
and standoff (4 places)
8
Case C61
7
3
6
0.400
(10.16)
4
0.700
(17.78)
1.000
(25.40)
1.400
(35.56)
Screw length must
not go through Baseplate
2.40
(60.96)
2.00
(50.8)
2.40
(61.0)
5
0.50
(12.70)
Bottom View
UCH with Optional Baseplate
B
Standard pin length is shown. Please refer to the Part Number Structure
for special order pin lengths.
INPUT/OUTPUT CONNECTIONS
Pin
Function P17
1
−Input
2
Case
3
On/Off Control
4
+Input
5
+Output
6
+Sense
7
Trim
8
−Sense
9
−Output
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
Pin 2 may be removed under special order.
The case pin 2 is normally only used in
combination with the baseplate. Please
contact Murata Power Solutions.
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MDC_UCH Models.D01 Page 13 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal body 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. Please be sure to install a properlyrated external input fuse (see Specifications).
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). Once operating, converters will not
turn off until the input voltage drops below the Under-Voltage Shutdown Limit.
Subsequent restart will not occur until the input voltage rises again above the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the
operating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final value of the input voltage as it
appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance,
performance is improved by adding external filter components. Sometimes only
a small ceramic capacitor is sufficient. Since it is difficult to totally characterize
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
Because of the switching nature of DC/DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifies that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (Cin in the figure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the figure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Your specific
system configuration may require additional considerations. Please note that
the values of Cin, Lbus and Cbus will vary according to the specific converter
model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+VIN
VIN
+
–
+
–
LBUS
CBUS
CIN
−VIN
CIN = 33μF, ESR < 700mΩ @ 100kHz
CBUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple and noise (also referred to as periodic
and random deviations or PARD) may be reduced by adding filter elements
such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR.
In the figure, the two copper strips simulate real-world printed circuit
impedances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half
inch and soldered directly to the fixture.
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MDC_UCH Models.D01 Page 14 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection,” that is, not using fan-forced airflow.
+SENSE
+VOUT
C1
C2
SCOPE
RLOAD
−VOUT
−SENSE
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifications).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed specifications. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling. The temperature sensor is typically
located adjacent to the switching controller, approximately in the center of the
unit. See the Performance and Functional Specifications.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite difficult to insert an anemometer to precisely measure airflow in
most applications. Sometimes it is possible to estimate the effective airflow if
you thoroughly understand the enclosure geometry, entry/exit orifice areas and
the fan flowrate specifications.
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Output Overvoltage Protection
This converter monitors its output voltage for an over-voltage condition. If
the output exceeds OVP limits, the sensing circuit will power down the unit,
and the output voltage will decrease. After a time-out period, the PWM will
automatically attempt to restart, causing the output voltage to ramp up to its
rated value. It is not necessary to power down and reset the converter for the
automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive
levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling
is referred to as “hiccup” mode. It safely tests full current rated output voltage
without damaging the converter.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
Output Current Limiting
As soon as the output current increases to approximately 125% to 150% of
its maximum rated value, the DC/DC converter will enter a current-limiting
mode. The output voltage will decrease proportionally with increases in output
current, thereby maintaining a somewhat constant power output. This is also
commonly referred to as power limiting.
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifications.
Note particularly that the output current may briefly rise above its rated value
in normal operation as long as the average output power is not exceeded. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
Output 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 (approximately 98% of nominal output voltage for most models), the magnetically
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MDC_UCH Models.D01 Page 15 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
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 up to its appropriate value.
If the short-circuit condition persists, another shutdown cycle will initiate. This
rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures
and/or component damage. A short circuit can be tolerated indefinitely.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condition is removed.
1
+SENSE
Note: The Sense input and power Vout lines are internally connected through
low value resistors to their respective polarities so that the converter can
operate without external connection to the Sense. Nevertheless, if the Sense
function is not used for remote regulation, the user should connect +Sense to
+Vout and –Sense to –Vout at the converter pins.
The remote Sense lines carry very little current. They are also capacitively
coupled to the output lines and therefore are in the feedback control loop to
regulate and stabilize the output. As such, they are not low impedance inputs
and must be treated with care in PC board layouts. Sense lines on the PCB
should run adjacent to DC signals, preferably Ground. In cables and discrete
wiring, use twisted pair, shielded tubing or similar techniques.
Any long, distributed wiring and/or significant inductance introduced into the
Sense control loop can adversely affect overall system stability. If in doubt, test
your applications by observing the converter’s output transient response during step loads. There should not be any appreciable ringing or oscillation. You
may also adjust the output trim slightly to compensate for voltage loss in any
external filter elements. Do not exceed maximum power ratings.
Please observe Sense inputs tolerance to avoid improper operation:
6
I OUT
Sense Current
3
ON/OFF
CONTROL
TRIM
7
LOAD
Sense Return
−SENSE
4
Remote Sense Input
Use the Sense inputs with caution. Sense is normally connected at the load.
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting IR voltage drops along the output wiring and the
current carrying capacity of PC board etch. This output drop (the difference between Sense and Vout when measured at the converter) should not be allowed
to exceed 0.5V. Consider using heavier wire if this drop is excessive. Sense
inputs also improve the stability of the converter and load system by optimizing
the control loop phase margin.
+VOUT
−VIN
Contact and PCB resistance
losses due to IR drops
5
8
I OUT Return
+VIN
-VOUT
9
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Configuration
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage
over the rated trim range (please refer to the Specifications). In the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or
a single fixed resistor connected between the Trim input and either the +Sense
or –Sense terminals. (On some converters, an external user-supplied precision
DC voltage may also be used for trimming). Trimming resistors should have a
low temperature coefficient (±100 ppm/deg.C or less) and be mounted close
to the converter. Keep leads short. If the trim function is not used, leave the
trim unconnected. With no trim, the converter will exhibit its specified output
voltage accuracy.
There are two CAUTIONs to be aware of for the Trim input:
CAUTION: To avoid unplanned power down cycles, do not exceed EITHER
the maximum output voltage OR the maximum output power when setting the
trim. Be particularly careful with a trimpot. If the output voltage is excessive,
the OVP circuit may inadvertantly shut down the converter. If the maximum
power is exceeded, the converter may enter current limiting. If the power is
exceeded for an extended period, the converter may overheat and encounter
overtemperature shut down.
CAUTION: Be careful of external electrical noise. The Trim input is a senstive
input to the converter’s feedback control loop. Excessive electrical noise may
cause instability or oscillation. Keep external connections short to the Trim
input. Use shielding if needed.
[Vout(+) −Vout(-)] − [Sense(+) −Sense(-)] ≤ 10% of Vout
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protection circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must
insure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
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MDC_UCH Models.D01 Page 16 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
Trim Equations
Trim Down
Connect trim resistor between
trim pin and −Sense
RTrimDn (kΩ) = 1 − 2
Δ
Trim Up
Connect trim resistor between
trim pin and +Sense
RTrimUp (kΩ) = VNOMINAL × (1 + Δ) − 1 − 2
Δ
1.225 × Δ
Where,
Where,
Δ = VNOMINAL − VOUT
VNOMINAL
Δ = VOUT − VNOMINAL
VNOMINAL
VNOM is the nominal, untrimmed output voltage.
VOUT is the desired new output voltage.
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.
Trim Circuits
+OUT
+IN
+SENSE
ON/OFF
TRIM
LOAD
–SENSE
–IN
–OUT
Figure 5. Trim Connections Using A Trimpot
+OUT
+IN
+IN
+SENSE
+OUT
+SENSE
RTRIM DOWN
ON/OFF
TRIM
LOAD
ON/OFF
TRIM
LOAD
RTRIM UP
–SENSE
–IN
–OUT
Figure 6. Trim Connections to Increase Output Voltages
–SENSE
–IN
–OUT
Figure 7. Trim Connections to Decrease Output Voltages
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MDC_UCH Models.D01 Page 17 of 18
Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either logic
type.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
Positive: Standard models are enabled when the On/Off pin is left open or
is pulled high to +Vin with respect to –Vin. An internal bias current causes the
open pin to rise to approximately +15V. Some models will also turn on at lower
intermediate voltages (see Specifications). Positive-logic devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce switching noise and/or to handle spike current step loads. Install only enough capacitance to achieve noise objectives. Excess external capacitance may cause
regulation problems, slower transient response and possible instability. Proper
wiring of the Sense inputs will improve these factors under capacitive load.
Negative: Optional negative-logic devices are on (enabled) when the On/Off
is grounded or brought to within a low voltage (see Specifications) with respect
to –Vin. The device is off (disabled) when the On/Off is left open or is pulled
high to approximately +15V with respect to –Vin.
The maximum rated output capacitance and ESR specification is given for a
capacitor installed immediately adjacent to the converter. Any extended output
wiring or smaller wire gauge or less ground plane may tolerate somewhat higher capacitance. Also, capacitors with higher ESR may use a larger capacitance.
Dynamic control of the On/Off function should be able to sink appropriate
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a finite time in milliseconds (see
Specifications) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
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, similar specifications and test methods with their root products, they
are provided at excellent costs and delivery. Please contact MPS for details.
There are several CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if
you carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor, a switch or a relay (which can thereupon be
controlled by logic) returned to negative Vin.
As of this date, the following products are available:
UCH-3.3/30-D48NBHL2-Y
UCH-5/10-D48NBHL2-Y
UCH-3.3/15-D48NBHL2-Y
UCH-3.3/35-D24NBHL2-Y
These are all negative On/Off logic, baseplate installed, conformal coating
added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with
lead).
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_UCH Models.D01 Page 18 of 18