UCE-3.3/30-D48NL1-C [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, 99W, Hybrid, PACKAGE-8;
| 型号： | UCE-3.3/30-D48NL1-C |
| 厂家： | 
muRata |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 99W, Hybrid, PACKAGE-8 |
| 文件： | 总17页 (文件大小：930K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LAST TIME BUY: AUGUST 31, 2014. CLICK HERE FOR OBSOLESCENCE NOTICE OF FEBRUARY 2014.
UCE Series
s
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FEATURES
Industry standard eighth-brick pinout
and package
Typical unit
Low profile 0.4" height with 0.9" x 2.3"
outline dimensions
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).
36 to 75 Vdc input range (48V nominal)
NOT RECOMMENDED
Fully isolated, 2250 Vdc (BASIC)
insulation
PRODUCT OVERVIEW
Outstanding thermal performance
and derating
FOR NEW DESIGNS
Units are offered with fixed output voltages from
1.5 to 12 Volts and currents up to 30 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.
UCEs 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.
Extensive self-protection and short
circuit features with no output reverse
conduction
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.
On/Off control, trim and sense functions
Interleaved synchronous rectification
yields high efficiency over 90%
Fully protected against temperature and
voltage limits
RoHS-6 or RoHS-5 compliant
Certified to UL/EN/IEC 60950-1 and
CAN/CSA C22.2 No. 60950-1, 2nd Edition
safety approvals
SIMPLIFIED BLOCK DIAGRAM
+SENSE
(7)
+VIN
(1)
+VOUT
(8)
SWITCH
CONTROL
−VOUT
(4)
–VIN
(3)
−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/support
MDC_UCE.D01 Page 1 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Input
Ripple & Noise
IIN, no IIN, full
(mVp-p)
Regulation (max.)
Efficiency
Min. Typ.
Package
Case Pinout
VOUT
IOUT Power
VIN Nom. Range
(V) (V)
load
load
(A)
Model Family
(V) (A)
(W)
Typ.
Max.
Line
Load
(mA)
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
1.2
1.5
1.5
1.8
2.5
3.3
3.3
5
25
20
40
30
20
15
30
10
20
4.2
8.3
10
30
Please contact Murata Power Solutions for further information.
0.3% 48 36-75 50 0.72 85%
Please contact Murata Power Solutions for further information.
UCE-1.2/25-D48
UCE-1.5/20-D48
UCE-1.5/40-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
UCE-12/10-D48
*
*
*
*
*
*
*
30
50
30
100
0.15%
87%
C56 P32
60
54
45
50
1.28
1.14
1.15
2.27
1.15
2.25
1.14
2.31
2.78
87%
88%
86%
89%
88%
90%
88%
91%
80
50
0.125%
0.1%
0.25%
0.2%
49.5
99
90%
50
60
30
100
60
91%
50
48
36-75
90.5%
92.5%
92%
C56 P32
5
100
50.4
99.6
120
30
OBSOLETE
OBSOLETE
12
12
12
150
0.125%
0.25%
50
*
300
86%
200
90%
*
Please refer to the model number structure for additional ordering part numbers and options.
http://www.murata-ps.com/en/products/obsolete-and-not-recommended.html
LAST TIME BUY: AUGUST 31, 2014. CLICK HERE FOR OBSOLESCENCE NOTICE OF FEBRUARY 2014.
*
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
OBSOLETE
*
(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)*
Nominal Output Voltage
*Special quantity order is required;
no sample quantities available.
Conformal coating (optional)
Blank = no coating, standard
Maximum Rated Output
H = Coating added, optional, special quantity order
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 Logic
N = Negative logic, standard
P = Positive logic, optional
As of September 2014, ONLY the following part numbers will be available: UCE-5/10-D48N-C; UCE-5/10-D48NB-C;
UCE-5/20-D48N-C; UCE-5/20-D48NB-C; UCE-12/10-D48N-C; UCE-12/10-D48NB-C
Product Adaptations
Murata Power Solutions offers several variations of our core product family.
These products are available under scheduled quantity orders and may also
include separate manufacturing documentation from a mutually agreeable
Product Specification. Since these product adaptations largely share a common
parts list and similar specifications and test methods with their root products,
they are provided at excellent costs and delivery. Please contact Murata Power
Solutions for details.
As of this date, the following products are available:
UCE-3.3/30-D48NHL2-Y
OBSOLETE
UCE-12/4.2-D48NHL2-Y
*
These models are all negative On/Off logic, no baseplate, conformal coating
added, 3.68mm pin length, and RoHS-5 hazardous substance compliance (with
lead).
www.murata-ps.com/support
MDC_UCE.D01 Page 2 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Under- Reflected
Remote On/Off Control
Start-up
threshold
Min.
voltage (back)
Shut- Ripple
down Current
Internal Reverse
Input Filter Polarity
Output
Short
Circuit
(mA)
Model Family
Inrush
Transient
A2sec
Low Line Standby
(VIN=min.) Mode
Positive Logic Negative Logic
Current
(mA)
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
3.70
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
UCE-12/10-D48
34
L-C
OFF=Ground
pin to +1V max.
ON=open or
OFF=open or
+2.5V to
+15V max.
32
50-150,
model
dependent
10-30,
model
dependent
1-10,
model
dependent
32
0.05
None, install
external fuse
1.0
A2sec
34.5
34
32
Pi
Pi
+3.5 to +15V ON=Ground pin to
31.5
max.
+0.8V max.
34
32
L-C
500
OUTPUT CHARACTERISTICS
VOUT
Current Limit
Inception
98% of Vout,
after warmup
A
Capacitive
Remote
Sense
Ripple/
Noise
Accuracy Loading Max. Low
50% Load ESR <0.02Ω Max. 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
UCE-12/10-D48
% of VNOM
μF
Range
Coefficient
Loading
sation bandwidth) Regulation Efficiency
24.5
36
10,000
32
24
–10 to
+10% of
Vnom.
0.02% of
Vout range
per °C
35
No minimum
load
1%
+10%
See ordering guide
1000
15.
10,000
23 min.
5.5
1000
12
13
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
UCE-12/10-D48
Isolation Safety Rating
100
10
2250
1500
1500
1000
Basic Insulation
100
www.murata-ps.com/support
MDC_UCE.D01 Page 3 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL SPECIFICATIONS, CONTINUED
MISCELLANEOUS CHARACTERISTICS
Overvoltage
Protection12
(V) Via
Operating
Temperature Range
Operating
PCB
Storage
Thermal
Short
Temperature Protection/ Circuit magnetic Short Circuit
Relative
Calculated
MTBF4
with derating
(°C)
Temperature
(no derating)
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
(ºC)
(A)
(V)
Duration16 (non-condensing)
1.95
TBC
2.8 V. max
3
Current
Continuous,
output
1.8 M HRS
2.4 M HRS
120
5
limiting,
−40 to +110
(model
4.25
hiccup
shorted
−55 to
+125
−40 to +85
autorestart.
Remove
to
to +85°C/85%
2.6 M HRS
2.7 M HRS
TBC
ground.
No dam-
age.
dependent)
110
125
0.5
5
7 max.
UCE-5/20-D48
overload for
recovery.
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
14.5
2.4 M HRS
ABSOLUTE MAXIMUM RATINGS
DYNAMIC CHARACTERISTICS
Dynamic Load
Start-up Time
Remote On/
Input Voltage:
Response
(50-75-50%
load step) to 1%
of final value,
μSec
Continuous:
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
+15 Volts
On/Off Control
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
(See note 1)
mSec
Input Reverse Polarity Protection
Output Overvoltage Protection
None, install external fuse.
100
150
100
200
50
50
10
50
50
15
50
10
60
50
60
50
10
50
50
10
50
10
60
50
60
480
400
350
480
380
400
330
Magnetic feedback.
See specifications.
Output Current
Current-limited. Devices can
withstand sustained short circuit
without damage.
100
100 max.
30
Storage Temperature
Lead Temperature
–40 to +125°C.
UCE-5/20-D48
See soldering guidelines.
UCE-12/4.2-D48
UCE-12/8.3-D48
UCE-12/10-D48
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
200
50
www.murata-ps.com/support
MDC_UCE.D01 Page 4 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FUNCTIONAL 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 overvoltage is non-latching. When the overvoltage 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 bi-
ased and will conduct considerable current. To ensure reverse input protection with full output
load, always connect an external input fuse in series with the +VIN input.
(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, UCE-12/10-D48
0.81 ounces (23 grams)
Meets EN55022/CISPR22 (requires external filter)
Electromagnetic interference (external filter required)
Safety
Certified to UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1, 2nd Edition
SOLDERING GUIDELINES
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceed-
ing these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with
your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
115ºC.
270ºC.
7 seconds
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105ºC.
250ºC.
6 seconds
www.murata-ps.com/support
MDC_UCE.D01 Page 5 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
TYPICAL PERFORMANCE DATA
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
20
16
12
8
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Vin = 75V
80
Vin = 48V
Vin = 36V
75
4
70
65
60
0
30
35
40
45
50
55
60
65
70
75
80
85
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
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
0
30
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (ºC)
3
5
7
9
11 13 15 17 19 21 23 25 27 29
Load Current (A)
UCE-2.5/20-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
UCE-2.5/20-D48 Maximum Current Temperature Derating
(Vin = 48V, with baseplate, longitudinal airflow at sea level)
95
90
85
80
75
70
20
18
16
14
12
10
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
Vin = 75V
Vin = 48V
Vin = 36V
1.5 m/s (300 LFM)
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)
www.murata-ps.com/support
MDC_UCE.D01 Page 6 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
TYPICAL PERFORMANCE DATA
UCE-3.3/15-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
UCE-3.3/15-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
95
90
15
12
9
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Vin = 75V
Vin = 48V
Vin = 36V
85
80
75
70
6
3
0
30
35
40
45
50
55
60
65
70
75
80
85
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
95
90
85
80
75
70
65
60
55
50
45
40
22
20
18
16
14
12
10
8
Vin = 75V
Vin = 48V
Vin = 36V
Power Dissipation
Vin = 48V
6
4
2
0
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)
UCE-3.3/30-D48 Maximum Current Temperature Derating
(Vin=48V, no baseplate, longitudinal airflow at sea level)
UCE-3.3/30-D48 Maximum Current Temperature Derating
(Vin=48V, no baseplate, transverse airflow at sea level)
35
35
30
25
20
15
10
5
30
25
20
15
10
5
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
0
0
30
40
50
60
70
80
30
40
50
60
70
80
Ambient Temperature (ºC)
Ambient Temperature (ºC)
www.murata-ps.com/support
MDC_UCE.D01 Page 7 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
TYPICAL PERFORMANCE DATA
UCE-5/10-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
UCE-5/10-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, transverse airflow, no baseplate)
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
3.5
3
11
10
9
2.5
2
8
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Vin = 75V
Vin = 48V
Vin = 36V
7
1.5
1
6
5
Power Dissipation (Vin = 48V)
4
0.5
0
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
1
2
3
4
5
6
7
8
9
10
Load Current (A)
UCE-5/20-D48 Efficiency Efficiency and Power Dissipation @ Ta = +25ºC
UCE-5/20-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, transverse airflow, no baseplate)
96
16
14
12
10
8
25
20
15
10
5
94
92
90
88
86
84
82
80
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
Vin = 75V
Vin = 48V
Vin = 36V
6
4
0
Power Dissipation (Vin = 48V)
2
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
0
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Load Current (A)
Thermal image with hot spot at full load current with 25 °C ambient; air is flowing at
100 LFM. Air is flowing across the converter from V– to V+ at 48V input. Identifiable
and recommended maximum value to be verified in application.
UCE-12/4.2-D48 Efficiency Vs. Line Voltage & Load Current @ +25ºC
T5 & Q7, max temp = 120 °C / IPC9592 guidelines.
95
90
85
80
75
70
65
60
Vin = 75V
Vin = 48V
Vin = 36V
0.6
1.2
1.8
2.4
3.0
3.6
4.2
Load Current (A)
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MDC_UCE.D01 Page 8 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
TYPICAL PERFORMANCE DATA
UCE-12/4.2-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
UCE-12/8.3-D48 Efficiency vs Line Voltage & Load Current @ 25ºC
95
90
85
80
75
70
4.25
4
Vin = 75V
Vin = 48V
Vin = 36V
1.0 to 2.0 m/s (200 to 400 LFM)
3.75
0.5 m/s (100 LFM)
3.5
3.25
3
3
4
5
6
7
8
30
40
50
60
70
80
Load Current (A)
Ambient Temperature (ºC)
UCE-12/8.3-D48 Maximum Current Temperature Derating
(Vin = 48V, no baseplate, longitudinal airflow at sea level)
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
9
8
7
6
5
4
3
2
1
0
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Ambient Temperature (ºC)
UCE-12/10-D48 Efficiency and Power Dissipation @ Ta = +25ºC
UCE-12/10-D48 Maximum Current Temperature Derating at sea level
(Vin = 48V, no baseplate, airflow direction from Vin to Vout)
100
95
90
85
80
75
70
65
60
55
50
45
40
12
10
8
28
24
20
16
12
8
Vin = 75V
Vin = 48V
Vin = 36V
6
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
4
2
0
Power Dissipation (Vin = 48V)
4
30
35
40
45
50
55
60
65
70
75
80
85
0
Ambient Temperature (ºC)
3
4
5
6
7
8
9
10
Load Current (A)
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MDC_UCE.D01 Page 9 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
MECHANICAL SPECIFICATIONS
Dimensions are in inches (mm shown for ref. only).
PIN Shoulder 1-3, 5-7:
ij0.078 0.003 (1.98 0.076)
Third Angle Projection
PIN Shoulder 4,8:
ij0.100 0.003 (2.54 0.076)
Open Frame
Without Baseplate
2.30 (58.4)
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
0.37 max
(9.4)
.XXX 0.010 (0.25)
Angles 2ꢀ
0.18
(4.6)
Components are shown for reference only.
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:
0.062 0.001 (1.575 0.025) dia.
3
4
0.300
(7.62)
0.300
0.15
(3.81)
0.900
(22.9)
2
(7.62)
1
DOSA-Compliant
INPUT/OUTPUT CONNECTIONS
Pin 8
Bottom view
Pin
1
2
3
4
Function P32
+Vin
On/Off Control
–Vin
Standard pin length is shown. Please refer to the Part Number Structure
for special order pin lengths.
–Vout
5
6
–Sense
Trim
7
8
+Sense
+Vout
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MDC_UCE.D01 Page 10 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
MECHANICAL SPECIFICATIONS
Dimensions are in inches (mm shown for ref. only).
With Baseplate
Third Angle Projection
Screw length must not
go through baseplate.
PIN Shoulder 1-3, 5-7:
ij0.078 0.003 (1.98 0.076)
PIN Shoulder 4,8:
ij0.100 0.003 (2.54 0.076)
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 2ꢀ
0.50
(12.7)
Components are shown for reference only.
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:
0.062 0.001 (1.575 0.025) dia.
3
4
0.300
(7.62)
0.300
0.15
(3.81)
0.900
(22.9)
2
(7.62)
1
Pin 8
DOSA-Compliant
INPUT/OUTPUT CONNECTIONS
Bottom view
2.00 (50.8)
Pin
1
Function P32
+Vin
2
3
4
5
On/Off Control
–Vin
–Vout
–Sense
Trim
M3 threaded insert 2
places, See notes 1&2
0.600
(15.24)
0.900
(22.9)
6
7
8
+Sense
+Vout
2.30 (58.4)
1. M3 screw used to bolt unit's baseplate to other surfaces (such as heatsink)
must not exceed 0.118'' (3mm) depth below the surface of baseplate
2. Applied torque per screw should not exceed 5.3 In-lb (0.6 Nm)
Standard pin length is shown. Please refer to the Part Number Struc-
ture for special order pin lengths.
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MDC_UCE.D01 Page 11 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
Input Source Impedance
TECHNICAL NOTES
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. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line with a value which is approximately twice the maximum line
current, calculated 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.
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.
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 rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as
capacitor inputs), the converter shuts off and then restarts as the external
capacitor recharges. Such situations could oscillate. To prevent this, make
sure the operating input voltage is well above the UV Shutdown voltage AT ALL
TIMES.
TO
CURRENT
PROBE
OSCILLOSCOPE
+VIN
−VIN
L
BUS
+
–
+
–
V
IN
CBUS
CIN
Start-Up Delay
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 rising input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and final value of the input voltage
as it appears at the converter.
C
IN = 33μF, ESR < 700mΩ @ 100kHz
BUS = 220μF, ESR < 100mΩ @ 100kHz
C
L
BUS = 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 the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified regulation
band. The specification assumes that the output is fully loaded at maximum
rated current.
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MDC_UCE.D01 Page 12 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile 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
RLOAD
SCOPE
C1
C2
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.
−VOUT
−SENSE
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Figure 3. Measuring Output Ripple and Noise (PARD)
Floating Outputs
Output Overvoltage Protection (OVP)
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.
Minimum Output Loading Requirements
Output Fusing
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.
The converter is extensively protected against current, voltage and temperature
extremes. However your application circuit may need additional protection. In
the extremely unlikely event of output circuit failure, excessive voltage could be
applied to your circuit. Consider using appropriate external protection.
Thermal Shutdown
To protect against thermal overstress, 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 adja-
cent 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
Output Short Circuit Condition
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.
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
coupled voltage used to develop the PWM bias voltage will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin rising to its appropriate value.
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MDC_UCE.D01 Page 13 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
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.
Contact and PCB resistance
losses due to IR drops
+VOUT
1
+VIN
IOUT
+SENSE
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 Current
ON/OFF
CONTROL
2
3
TRIM
SENSE
-VOUT
LOAD
Sense Return
IOUT Return
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 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.
−VIN
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 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 observe 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.
Please observe Sense inputs tolerance to avoid improper operation:
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 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
ensure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
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MDC_UCE.D01 Page 14 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
Trimming by Using an External Voltage Source
+VOUT
1. The easiest way to trim the output using an external voltage source is to
drive the Trim pin directly from a variable source. The following equation can
be used to calculate the voltage at the Trim pin.
+VIN
External
+SENSE
source
+
–
Vo
ON/OFF
CONTROL
TRIM
–SENSE
–VOUT
LOAD
Vtrim = 2 x 1.225 x
− 1.225
Vonominal
Vo is the output voltage you want; Vonominal is the nominal output voltage;
Vtrim is the voltage that should appear at the trim pin.
–VIN
2. If the purpose of trimming is to compensate voltage drop of power path
from converter to the Load, you may separately connect the sense pin directly
to the load. It’s much easier than real time adjusting trim voltage.
Figure 5.Trimming with an external source
3. CAUTION: To avoid unplanned power down cycles, do not exceed EITHER
the maximum output voltage OR the maximum output power when setting
the trim. If the output voltage is excessive, the OVP circuit may 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. Be careful of external
electrical noise. The Trim input is a sensitive input to the converter’s feedback
control loop. Excessive electrical noise may cause instability or oscillation.
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+Δ)
1.225 × Δ
− 5.11
5.11
Δ
RTrimDn (k Ω) =
RTrimUp (k Ω) =
− 10.22
− 10.22
Δ
Where,
Δ = | (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.
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MDC_UCE.D01 Page 15 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
Trim Circuits
+VOUT
+SENSE
TRIM
+VIN
+VCC
ON/OFF
CONTROL
ON/OFF
CONTROL
LOAD
–SENSE
–VOUT
-VIN
–VIN
Figure 6.Trim Connections Using A Trimpot
Figure 8. Driving the On/Off Control Pin (suggested circuit)
+VOUT
+SENSE
TRIM
+VOUT
+SENSE
TRIM
+VIN
+VIN
RTRIM DOWN
ON/OFF
CONTROL
ON/OFF
CONTROL
LOAD
LOAD
RTRIM UP
–SENSE
–VOUT
–SENSE
–VOUT
–VIN
–VIN
Figure 7.Trim Connections To Increase Output Voltages
Figure 9.Trim Connections To Decrease Output Voltages
Connect sense to its respective VOUT pin if sense is not used with a remote load.
Remote On/Off Control
There are two CAUTIONs for the On/Off Control:
On the input side, a remote On/Off Control can be specified with either positive
or negative logic logic.
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: Models equipped with positive logic 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.
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
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.
Negative: Models with negative logic are on (enabled) when the On/Off is
grounded or brought to within a low voltage (see Specifications) with respect to
–Vin. The device is off (disabled) when the On/Off is left open or is pulled high
to approximately +15V with respect to –Vin.
Dynamic control of the On/Off function should be able to sink the speci-
fied 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.D01 Page 16 of 17
UCE Series
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products.
The system includes a precision low flow-rate anemometer,
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
IR Video
Camera
Both through-hole and surface mount converters are
soldered down to a 10"x 10" host carrier board for realistic
heat absorption and spreading. Both longitudinal and trans-
verse airflow studies are possible by rotation of this carrier
board since there are often significant differences in the heat
dissipation in the two airflow directions. The combination of
adjustable airflow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
Heating
element
Precision
low-rate
anemometer
3” below UUT
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbu-
lence influences the effective heat transfer characteristics
and gives false readings. Excess turbulence removes more
heat from some surfaces and less heat from others, possibly
causing uneven overheating.
Ambient
temperature
sensor
Airflow
collimator
Both sides of the UUT are studied since there are different
thermal gradients on each side. The adjustable heating element
and fan, built-in temperature gauges, and no-contact IR camera mean
that power supplies are tested in real-world conditions.
Figure 10. Vertical Wind Tunnel
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_UCE.D01 Page 17 of 17
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