UCE-2.5/20-D48N-C [MURATA]
Isolated, High-Density, Eighth-Brick 100W DC/DC Converters; 隔离式，高密度，八分之一砖100W DC / DC转换器
| 型号： | UCE-2.5/20-D48N-C |
| 厂家： | 
muRata |
| 描述： | Isolated, High-Density, Eighth-Brick 100W DC/DC Converters |
| 文件： | 总16页 (文件大小：281K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
-om
FEATURES
■
ꢀRoHS compliant
Typical unit
■
ꢀIndustry standard eighth-brick pinout
and package
For efficient, fully isolated DC power in the smallest space, the UCE
open frame DC/DC converter series fit in industry-standard “eighth
brick” outline dimensions and mounting pins (on quarter-brick pinout).
■
ꢀOutputs from 1.5V to 12V up to 100W
■
ꢀLow profile 0.4" height with 0.9" x 2.3"
outline dimensions
■
ꢀ36 to 75 Vdc input range (48V nominal)
PRODUCT OVERVIEW
■
ꢀFully isolated, 2250 Vdc (BASIC)
insulation
Units are offered with fixed output voltages from
1.5 to 12 Volts and currents up to 40 Amps. UCEs
operate over a wide temperature range (up to +85
degrees Celsius at moderate airflow) with full rated
power. Interleaved synchronous rectifier topology
yields excellent efficiency over 90% and no reverse
output conduction.
UCE’s achieve these impressive mechanical and
environmental specs while delivering excellent
electrical performance in a through-hole package.
Overall noise is typically 50 mV pk-pk (low voltage
models) with fast step response. These converters
offer tight output regulation and high stability even
with no load. The unit is fully protected against
input undervoltage, output overcurrent and short
circuit. An on-board temperature sensor shuts
down the converter if thermal limits are reached.
“Hiccup” output protection automatically restarts
the converter when the fault is removed.
■
ꢀOutstanding thermal performance
and derating
A convenient remote On/Off control input enables
phased startup and shutdown in multi-voltage ap-
plications. To compensate for longer wiring and to
retain output voltage accuracy at the load, UCEs em-
ploy a Sense input to dynamically correct for ohmic
losses. A trim input may be connected to a user’s
adjustment potentiometer or trim resistors for output
voltage calibration. The UCE will tolerate substantial
capacitive loading for bypass-cap applications.
UCEs include industry-standard safety certifica-
tions and BASIC I/O insulation provides input/output
isolation to 2250V. Radiation emission testing is
performed to widely-accepted EMC standards.
■
ꢀExtensive self-protection and short
circuit features with no output reverse
conduction
■
ꢀOn/Off control, trim and sense functions
■
ꢀInterleaved synchronous rectification
yields high efficiency over 90%
■
ꢀFully protected against temperature and
voltage limits
■
ꢀDesigned to meet UL/EN/IEC 60950-1
and CAN/CSA C22.2 No. 60950-1 safety
approvals
SIMPLIFIED BLOCK DIAGRAM
+SENSE
(7)
+VIN
(3)
+VOUT
(8)
SWITCH
CONTROL
−VOUT
(4)
–VIN
(1)
−SENSE
(5)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
PULSE
TRANSFORMER
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT TRIM
(6)
REMOTE
ON/OFF
CONTROL
(2)
Typical topology is shown.
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 1 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Output
Input
Ripple & Noise
(mVp-p)
IIN, no
load
(mA)
IIN, full
load
(A)
Regulation (max.)
Efficiency
Package
Case Pinout
VOUT
(V)
IOUT
(A)
Power
(W)
VIN Nom. Range
(V) (V)
Model Family
Typ.
Max.
Line
Load
Min.
Typ.
UCE-1.2/40-D48N-C
UCE-1.5/20-D48N-C
UCE-1.5/40-D48N-C
UCE-1.8/30-D48N-C
UCE-2.5/20-D48N-C
UCE-2.5/40-D48N-C
UCE-3.3/15-D48N-C
UCE-3.3/30-D48N-C
UCE-5/10-D48N-C
UCE-5/20-D48N-C
UCE-12/4.2-D48N-C
UCE-12/8.3-D48N-C
1.2
1.5
1.5
1.8
2.5
2.5
3.3
3.3
5
40
20
40
30
20
40
15
30
10
20
4.2
8.3
48
30
Please contact Murata Power Solutions for further information.
0.3% 48 36-75 50 0.72
Please contact Murata Power Solutions for further information.
50
100
0.15%
85%
87%
C56
C56
P32
P32
60
54
30
50
80
80
0.125%
0.125%
0.25%
0.25%
45
50
1.28
1.14
87%
88%
88%
91%
48
36-75
50
100
49.5
99
Please contact Murata Power Solutions for further information.
0.125%
0.1%
0.25%
0.2%
1.15
2.27
1.15
86%
89%
88%
90%
91%
50
50
100
100
60
50
0.125%
0.25%
30
90.5%
48
36-75
C56
P32
Please contact Murata Power Solutions for further information.
PleasecontactMurataPowerSolutionsforfurtherinfo..
5
100
50.4
99.6
12
12
150
1.14
2.31
92%
90%
300
0.125%
0.25%
50
86%
200
ꢀ Please refer to the model number structure for additional ordering part numbers and options .
PART NUMBER STRUCTURE
U CE - 3.3 / 30 - D48 N B H LX - C
Output Configuration:
RoHS Hazardous Materials compliance
C = RoHS6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Y = RoHS5 (with lead), optional, special quantity order
U = Unipolar/Single
(Through-hole packages only)
Pin Length Option
Eighth-Brick Package
Blank = Standard pin length 0.180 inches (4.6mm)
L1 = Pin length 0.110 inches (2.79mm)*
L2 = Pin length 0.145 inches (3.68mm)*
* Special quantity order is required.
Nominal Output Voltage
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional, special quantity order
Maximum Rated Output
Current in Amps
Baseplate (optional, not available on some models)
Blank = No baseplate, standard
Input Voltage Range:
B = Baseplate installed, optional, special quantity order
D48 = 36-75V,
48V nominal
Note: Some model combinations may not be
available. Contact Murata Power Solutions for
availability.
On/Off Control Polarity
N = Negative polarity, standard
P = Positive polarity, optional
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 2 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
SPECIFICATIONS
INPUT CHARACTERISTICS
Under- Reflected
voltage (back)
Remote On/Off Control
Start-up
threshold
Min.
Internal Reverse
Input Filter Polarity
Output
Short
Circuit
(mA)
Model Family
Shut-
Ripple
Inrush
Transient
A2sec
Low Line Standby
(VIN=min.) Mode
Positive Logic Negative Logic
Current
(mA)
down Current
Type
Protection
“P” Model
Suffix
“N” Model
Suffix
(A)
(V)
(mA)②
(A)
(mA)
32
32.5
32
0.97
1.72
1.53
1.54
3.06
1.53
3.00
1.52
3.07
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
34
L-C
OFF=Ground
pin to +1V max.
ON=open or
OFF=open or
+2.5V to
+15V max.
32
10-30,
model
dependent
50-150,
model
dependent
1-10,
model
dependent
0.05
32
See notes
1.0
A2sec
+3.5 to +15V ON=Ground pin to
34.5
34
32
Pi
Pi
max.
+0.8V max.
31.5
32
34
L-C
32
OUTPUT CHARACTERISTICS
VOUT
Capacitive
Loading Max. Low
Current Limit
Inception
98% of Vout,
after warmup
A
Remote
Sense
Ripple/
Noise
Accuracy ESR <0.02Ω Max.
50% Load
% of VNOM
resistive load
μF
Adjustment Temperature Minimum Compen- (20 MHz
Line/Load
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
Range
Coefficient
Loading
sation bandwidth) Regulation Efficiency
10,000
10,000
10,000
10,000
10,000
1000
24.5
36
32
24
–10 to
+10% of
Vnom.
0.02% of
Vout range
per °C
No minimum
load
1%
+10%
See ordering guide
35
15.
10,000
1000
23 min.
5.5
1000
12
ISOLATION CHARACTERISTICS
Input to Output
Input to
baseplate
Min.
V
Baseplate to output
Isolation
Resistance
MΩ
Isolation
Capacitance
pF
Min.
V
Min.
V
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
Isolation Safety Rating
100
10
2250
1500
1500
1000
Basic Insulation
100
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 3 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
SPECIFICATIONS, CONTINUED
MISCELLANEOUS CHARACTERISTICS
Overvoltage
Protection12
(V) Via
Operating
Operating
PCB
Temperature
(no derating)
Storage
Thermal
Short
Temperature Range
with derating
(°C)
Temperature Protection/ Circuit magnetic Short Circuit
Relative
Calculated
MTBF4
Range
(°C)
Shutdown Current feedback
Protection Short Circuit
Method
Humidity
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
(ºC)
(A)
(V)
Duration16 (non-condensing)
1.95
TBC
1.8 M HRS
TBC
2.8 V. max
3
Current
limiting,
hiccup
120
5
Continuous,
output
4.25
7 max.
14.5
−55 to
+125
−40 to +85
−40 to +120
autorestart. shorted to
to +85°C/85%
Remove
overload for
recovery.
ground. No
damage.
2.6 M HRS
2.7 M HRS
TBC
110
125
0.5
5
2.4 M HRS
ABSOLUTE MAXIMUM RATINGS
DYNAMIC CHARACTERISTICS
Dynamic Load
Start-up Time
Remote On/
Input Voltage:
Continuous:
Response
(50-75-50%
load step) to 1%
of final value,
μSec
48 Volt input models
Transient (100 mSec. Max.)
48 Volt input models
75 Volts
VIN to VOUT
regulated
(Max.)
Off to VOUT
regulated
(Max.)
Switching
Frequency
KHz
100 Volts
On/Off Control
+15 Volts
Model Family
UCE-1.5/20-D48
UCE-1.8/30-D48
UCE-2.5/20-D48
UCE-3.3/15-D48
UCE-3.3/30-D48
UCE-5/10-D48
UCE-5/20-D48
UCE-12/4.2-D48
UCE-12/8.3-D48
mSec
Input Reverse Polarity Protection
Output Overvoltage Protection
5 Amps, 10 sec. max.
100
150
50
10
50
50
15
50
10
60
50
50
10
50
50
10
50
10
60
50
480
400
350
480
380
400
330
Magnetic feedback.
See specifications.
100
Output Current
Current-limited. Devices can
withstand sustained short circuit
without damage.
200
50
100
Storage Temperature
Lead Temperature
–40 to +125°C.
100 max.
30
See soldering guidelines.
200
Absolute maximums are stress ratings. Exposure of devices to greater than any of these
conditions may adversely affect long-term reliability. Proper operation under conditions
other than those listed in the Performance/Functional Specifications Table is not implied
or recommended.
50
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 4 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
SPECIFICATIONS, CONTINUED
PERFORMANCE SPECIFICATION NOTES
(1) All models are tested and specified with external 1||10 μF ceramic/tantalum output capaci-
tors 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.
(7) The outputs are not intended to sink appreciable reverse current. This may damage the
outputs.
(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
–40ºC.
General conditions for Specifications are +25 deg.C, VIN = nominal, VOUT = nominal, full load.
Adequate airflow must be supplied for extended testing under power.
(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.
(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.
(11) Alternate pin length and/or other output voltages are available under special quantity order.
(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 density altitude.
(12) Output current limit 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.
(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.
(15) If reverse polarity is accidentally applied to the input, a body diode will become forward
biased and will conduct considerable current. To ensure reverse input protection with full out-
put 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.
(5) The On/Off Control is normally controlled by a switch. But it may also be driven with exter-
nal logic or by applying appropriate external voltages which are referenced to Input Common.
The On/Off Control Input should use either an open collector or open drain transistor.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from
the selected setting.
PHYSICAL CHARACTERISTICS
Outline dimensions
Pin material
See mechanical specs (below)
Copper alloy
Pin diameter
Pin finish
0.04/0.062" (1.016/1.524mm)
Nickel underplate with gold overplate
0.67 ounces (19 grams)
UCE-1.5/20-D48
UCE-1.8/30-D48,
UCE-2.5/20-D48
UCE-5/10-D48
0.71 ounces (20 grams)
Weight
UCE-5/20-D48
UCE-12/4.2-D48
UCE-3.3/15-D48
1 ounce (28 grams)
UCE-3.3/30-D48, UCE-12/8.3-D48
0.81 ounces (23 grams)
FCC part 15, class B, EN55022
Electromagnetic interference (conducted and radiated)
(external filter required)
Safety
Designed to meet UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1
SOLDERING GUIDELINES
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type.
Exceeding these specifications may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild
pre-bake (100ºC. for 30 minutes). 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
Maximum Pot Temperature
Maximum Solder Dwell Time
115ºC.
270ºC.
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105ºC.
250ºC.
6 seconds
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 5 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
MECHANICAL SPECIFICATIONS
Without Baseplate
2.30 (58.4)
0.40 max
(10.2)
0.18
(4.6)
0.015 minimum clearance
between standoffs and
highest component
2.00 (50.8)
PINS 1-3, 5-7:
0.040 0.001 (1.016 0.025) dia.
PINS 4, 8:
0.060 0.001 (1.524 0.025) dia.
Dimensions are in inches (mm shown for ref. only).
1
4
0.300
(7.62)
0.300
Third Angle Projection
0.15
(3.81)
0.900
(22.9)
2
(7.62)
3
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 2ꢀ
Pin 8
Bottom view
Components are shown for reference only.
With Baseplate
PINS 1-3, 5-7:
0.040 0.001 (1.016 0.025) dia.
Please note that some
Screw length must not
go through baseplate.
competitive units may use
different pin numbering or
alternate outline views. However
all units are plug-compatible.
PINS 4, 8:
0.060 0.001 (1.524 0.025) dia.
0.50
(12.7)
0.18
(4.6)
0.015 minimum clearance
between standoffs and
highest component
2.00 (50.8)
INPUT/OUTPUT CONNECTIONS
Pin
1
2
3
4
Function P32
−Input
On/Off Control
+Input
−Output
−Sense
1
4
0.300
(7.62)
0.15
(3.81)
0.900
(22.9)
2
0.300
(7.62)
5
6
7
Output Trim
+Sense
3
8
+Output
Pin 8
Bottom view
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UCE.A18 Page 6 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
APPLICATION NOTES
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 imped-
ance, performance is improved by adding external filter components. Some-
times 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.
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. We
recommend a time delay fuse installed in the ungrounded input supply line
with a value which is approximately twice the maximum line current, calcu-
lated at the lowest input voltage.
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.
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 properly-
rated external input fuse (see Specifications).
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 compo-
nents, circuits and layout as shown in the figures below. External input capaci-
tors (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.
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 opera-
tion 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.
TO
CURRENT
PROBE
OSCILLOSCOPE
4
+INPUT
−INPUT
L
BUS
+
–
+
V
IN
CBUS
CIN
–
Start-Up Time
1
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.
C
IN = 33μF, ESR < 700mΩ @ 100kHz
BUS = 220μF, ESR < 100mΩ @ 100kHz
C
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 tempera-
ture rise from reflected AC current dissipated inside capacitor ESR.
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.
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_UCE.A18 Page 7 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W 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.
6
5
COPPER STRIP
+SENSE
+OUTPUT
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.
RLOAD
SCOPE
C1
C2
9
8
−OUTPUT
−SENSE
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
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.
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Floating Outputs
Output Overvoltage Protection
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.
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.
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.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protec-
tion. 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.
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.
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.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the next section 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.
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 (approxi-
mately 98% of nominal output voltage for most models), the magnetically
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MDC_UCE.A18 Page 8 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W 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.
Contact and PCB resistance
losses due to IR drops
5
+OUTPUT
1
−
INPUT
IOUT
6
+SENSE
Sense Current
7
ON/OFF
CONTROL
3
4
TRIM
LOAD
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 condi-
tion is removed.
Sense Return
IOUT Return
8
9
−
SENSE
+INPUT
-OUTPUT
Remote Sense Input
Contact and PCB resistance
losses due to IR drops
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.
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 equa-
tions 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.
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.
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.
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.
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. Also consider adding a small value ceramic
capacitor between the Trim and –Vout to bypass RF and electrical noise.
Please observe Sense inputs tolerance to avoid improper operation:
[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 protec-
tion 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_UCE.A18 Page 9 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Trim Equations
Trim Down
Trim Up
Connect trim resistor between
Connect trim resistor between
trim pin and −Sense
trim pin and +Sense
5.11 × VNOM × (1+ꢀ)
1.225 × ꢀ
− 5.11
5.11
ꢀ
RTrimDn (k Ω) =
RTrimUp (k Ω) =
− 10.22
− 10.22
ꢀ
Where,
ꢀ = | (VNOM − VOUT) / VNOM |
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
+OUTPUT
+SENSE
TRIM
–INPUT
+VCC
3
1
ON/OFF
ON/OFF
CONTROL
LOAD
CONTROL
–SENSE
–OUTPUT
-INPUT
+INPUT
Figure 5.Trim Connections Using A Trimpot
Figure 7. Driving the On/Off Control Pin (suggested circuit)
+OUTPUT
+SENSE
TRIM
+OUTPUT
–INPUT
–INPUT
ON/OFF
+SENSE
RTRIM DOWN
ON/OFF
TRIM
LOAD
LOAD
CONTROL
CONTROL
RTRIM UP
–SENSE
–SENSE
+INPUT
+INPUT
–OUTPUT
–OUTPUT
Figure 6.Trim Connections To Increase Output Voltages
Figure 8.Trim Connections To Decrease Output Voltages
Connect sense to its respective VOUT pin if sense is not used with a remote load.
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MDC_UCE.A18 Page 10 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Remote On/Off Control
There are several CAUTIONs for the On/Off Control:
On the input side, a remote On/Off Control can be ordered with either polarity.
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.
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-polarity devices are
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifications) with respect to –Vin.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
Output Capacitive Load
Negative: Optional negative-polarity 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.
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce switch-
ing noise and/or to handle spike current step loads. Install only enough capaci-
tance 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.
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.
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.
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MDC_UCE.A18 Page 11 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Typical Performance Curves
UCE-1.5/20-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
UCE-1.5/20-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
90
85
80
75
70
65
60
20
18
16
14
12
10
400 LFM
Vin = 75V
Vin = 48V
Vin = 36V
300 LFM
200 LFM
100 LFM
30
40
50
60
70
80
Ambient Temperature (ºC)
3
6
9
12
15
18
Load Current (A)
UCE-1.8/30-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
UCE-1.8/30-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
Vin = 75V
Vin = 48V
Vin = 36V
400 LFM
300 LFM
200 LFM
100 LFM
0
30
35
40
45
50
55
60
65
70
75
80
3
5
7
9
11 13 15 17 19 21 23 25 27 29
Load Current (A)
Ambient Temperature (ºC)
UCE-2.5/20-D48 Maximum Current Temperature Derating
(Vin = 48V, with baseplate, longitudinal airflow at sea level)
UCE-2.5/20-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
20
18
16
14
12
10
95
90
85
80
75
70
300 LFM
200 LFM
100 LFM
Vin = 75V
Vin = 48V
Vin = 36V
Natural Convection
30
40
50
60
70
80
Ambient Temperature (ºC)
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Load Current (A)
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MDC_UCE.A18 Page 12 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Typical Performance Curves
UCE-3.3/15-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
UCE-3.3/15-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
95
90
85
80
75
70
16
14
12
10
8
Vin = 75V
Vin = 48V
Vin = 36V
400 LFM
300 LFM
200 LFM
100 LFM
6
4
2
0
30
40
50
60
70
80
Ambient Temperature (ºC)
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Current (A)
UCE-3.3/30-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
UCE-3.3/30-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
95
90
85
80
75
70
65
60
55
50
45
40
35
Vin = 75V
Vin = 48V
Vin = 36V
30
25
20
15
10
5
400 LFM
300 LFM
200 LFM
100 LFM
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Load Current (A)
0
30
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (ºC)
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MDC_UCE.A18 Page 13 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Typical Performance Curves
UCE-5/10-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, transverse airflow, no baseplate)
UCE-5/10-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
3.5
11
10
9
3
2.5
2
8
Natural Convection
Vin = 75V
Vin = 48V
Vin = 36V
7
100 LFM
200 LFM
300 LFM
400 LFM
1.5
1
6
5
Power Dissipation (Vin = 48V)
4
30
35
40
45
50
55
60
65
70
75
80
85
0.5
Ambient Temperature (ºC)
0
10
1
2
3
4
5
6
7
8
9
Load Current (A)
UCE-5/20-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, transverse airflow, no baseplate)
UCE-5/20-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
96
94
92
90
88
86
84
82
80
16
14
12
10
8
25
20
15
10
5
Vin = 75V
Vin = 48V
Vin = 36V
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
6
4
0
Power Dissipation (Vin = 48V)
2
30
35
40
45
50
55
60
65
70
75
80
85
0
Ambient Temperature (ºC)
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Load Current (A)
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MDC_UCE.A18 Page 14 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
Typical Performance Curves
UCE-12/4.2-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
UCE-12/4.2-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
95
90
85
80
75
70
65
60
4.25
4
Vin = 75V
Vin = 48V
Vin = 36V
200 to 400 LFM
100 LFM
3.75
3.5
3.25
3
0.6
1.2
1.8
2.4
3.0
3.6
4.2
30
40
50
60
70
80
Load Current (A)
Ambient Temperature (ºC)
UCE-12/8.3-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
UCE-12/8.3-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
95
90
85
80
75
70
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
400 LFM
300 LFM
200 LFM
100 LFM
Vin = 75V
Vin = 48V
Vin = 36V
30
35
40
45
50
55
60
65
70
75
80
85
3
4
5
6
7
8
Ambient Temperature (ºC)
Load Current (A)
UCE-12/8.3-D48 Maximum Current Temperature Derating at sea level
(Vin = 48V, with baseplate, airflow is from -Vin to +Vin)
9
8
7
6
5
4
3
2
1
0
400 LFM
300 LFM
200 LFM
100 LFM
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
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MDC_UCE.A18 Page 15 of 16
UCE Series
Isolated, High-Density, Eighth-Brick
100W DC/DC Converters
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Canada:
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Murata Power Solutions, Inc.
France:
Germany:
Japan:
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
03/27/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
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MDC_UCE.A18 Page 16 of 16
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