UEL15-150-Q48NL2C [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, 16.5W, Hybrid, ROHS COMPLIANT PACKAGE-6;
| 型号： | UEL15-150-Q48NL2C |
| 厂家： | 
muRata |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 16.5W, Hybrid, ROHS COMPLIANT PACKAGE-6 |
| 文件： | 总14页 (文件大小：396K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UEI15 Series
s
Isolated Wide Input Range 15-Watt DC/DC Converters
Typical unit
Featuring a full 15 Watt or greater output in one square inch of board area, the UEI
series isolated DC/DC converter family offers efficient regulated DC power for printed
circuit board mounting.
PRODUCT OVERVIEW
Wide range 4:1 inputs on the 0.96" x 1.1" x 0.32"
converter are either 9 to 36 Volts DC (Q12 models)
or 18 to 75 Volts DC (Q48 models), ideal for battery-
powered and telecom equipment. The industry-
standard pinout fits larger 1" x 2" converters. Fixed
output voltages from 3.3 VDC to 15 VDC are regu-
lated to within 0.2ꢀ or less and may be trimmed
within 10ꢀ of nominal output. Applications
include small instruments, area-limited microcon-
trollers, computer-based systems, data communi-
cations equipment, remote sensor systems, vehicle
and portable electronics.
The UEI 15W series includes full magnetic and
optical isolation up to 2250 Volts DC (basic insula-
tion). For connection to digital systems, the outputs
offer fast settling to current step loads and toler-
ance of higher capacitive loads. Excellent ripple
and noise specifications assure compatibility to
circuits using CPU’s, ASIC’s, programmable logic
and FPGA’s. For systems requiring controlled
startup/shutdown, an external switch, transis-
tor or digital logic may be used to activate the
remote On/Off control.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout and overtem-
perature shutdown. The outputs current limit using
the “hiccup” autorestart technique and the outputs
may be short-circuited indefinitely. Additional
features include output overvoltage and reverse
conduction elimination.
FEATURES
ꢀSmall footprint DC/DC converter, ideal for
high current applications
ꢀIndustry standard 0.96" x 1.1" X 0.32" open
frame package and pinout
ꢀWide range input voltages 9-36 and 18-75 Vdc
ꢀAssembly and attachment for RoHS standards
ꢀIsolation up to 2250 VDC (basic)
ꢀUp to 15 Watts or greater total output power
with overtemperature shutdown
ꢀHigh efficiency synchronous rectifier forward
topology
The high efficiency offers minimal heat buildup
and “no fan” operation.
ꢀStable operation with no required external
components
ꢀUsable -40 to 85°C temperature range (with
derating)
Contents
Page
Description, Photograph, Connection Diagram
Ordering Guide, Model Numbering
Mechanical Specifications, Input/Output Pinout
1
2
3
ꢀMeets UL 60950-1, CAN/CSA-C22.2 No. 60950-
1, IEC60950-1, EN60950-1 safety approvals
Detailed Electrical Specifications
Application Notes
6
8
ꢀExtensive self-protection shut down features
Soldering Guidelines
Performance Data
11
12
SIMPLIFIED SCHEMATIC
+VOUT
+VIN
–VOUT
On/Off
Control
Control
GATE DRIVE
ISOLATION BARRIER
Reference, Trim &
Error Amplifier
−VIN
TRIM
ISOLATION
3.3V and 5VOUT models only.
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
email: sales@murata-ps.com
20 Apr 2010 MDC_UEI15W.B37 Page 1 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
➀
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Output
Input
IIN =
no
Open Frame
Package – C75
R/N (mVp-p) ➁ Regulation (Max.)
IIN =
full
Efficiency
VIN
VOUT
IOUT Power
Nom. Range load load
Case
Root Models ➀
(V) (A)ꢁ (W)
Typ. Max.
Line
Load
0.1ꢀ
0.2ꢀ
(V)
(V) (mA) (A)
Min.
Typ.
(inches)
(mm)
Pinout
UEI15-033-Q12 3.3
UEI15-033-Q48 3.3
4.5 14.85
60
60
90
90
0.05ꢀ
0.2ꢀ
24
9-36 43
0.71 86.5ꢀ 89ꢀ
0.4 86.5ꢀ 88.8ꢀ
0.72 86.3ꢀ 87.3ꢀ
0.36 84.3ꢀ 86.0ꢀ
0.77 82.3ꢀ 84.5ꢀ
0.38 83.3ꢀ 85ꢀ
0.81 83.5ꢀ 85ꢀ
0.4 83.3ꢀ 85.3ꢀ
5
3
3
16.5
15
48 18-75 24
9-36 41
48 18-75 28
24 9-36 15
48 18-75 15
24 9-36 18
48 18-75 14
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
5
70
125
95
0.05ꢀ
0.05ꢀ
0.05ꢀ
0.075ꢀ 24
5
15
60
0.06ꢀ
0.05ꢀ
1.1×0.96×0.32
27.9×24.4×8.1
P85
12
12
15
15
1.3 15.6
1.3 15.6
1.1 16.5
1.1 16.5
110
85
150
120
175
120
0.0 75ꢀ 0.05ꢀ
130
80
0.05ꢀ
0.05ꢀ
0.05ꢀ
0.05ꢀ
➀ Please refer to the part number structure for additional options and complete
ordering part numbers.
➂ Minimum output load for UEI15-033-Q12, UEI15-120-Q12 and UEI15-050-Q12 is
10ꢀ of maximum current.
➁ All specifications are typical at nominal line voltage and full load, +25 deg.C. unless
otherwise noted. See detailed specifications.
➃ RoHS-6 compliance does not claim EU RoHS exemption 7b (lead in solder).
PART NUMBER STRUCTURE
UEI15 - 033 - Q12 P M Lx - C
RoHS-6 Hazardous
Substance Compliance (note 4)
Unipolar Wide Input
15-Watt Series
Pin Length Option
Blank = Std. pin length 0.25˝ (6.3mm)
Nominal Output Voltage
in Tenths of a Volt
L1 = 0.110˝ (2.79mm)
L2 = 0.145˝ (3.68mm)
Alternate pin lengths
require quantity order.
}
Surface Mount Option
Blank = Standard through-hole pin mount version
Input Voltage Range
Q12 = 9-36V
M = SMT version (Preliminary – contact Murata Power Solutions for availability.)
Q48 = 18-75V
On/Off Control Polarity:
P = Positive
Note:
Some model number combinations
N = Negative
may not be available.
Contact Murata Power Solutions.
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email: sales@murata-ps.com
20 Apr 2010 MDC_UEI15W.B37 Page 2 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MECHANICAL SPECIFICATIONS, OPEN FRAME
TOP VIEW
PHYSICAL CHARACTERISTICS
27.9
1.10
Pin Material
Pin Diameter
Pin Finish
Weight
Copper alloy
Case 75
0.04˝ (1.016mm)
Gold plate
PIN #1
0.352 oz./10 grams
EN55022/CISPR22 (see note 1)
(Requires external filter)
UL 94V-0
Electromagnetic Interference
Flammability Rating
Safety
24.4
0.96
UL/cUL 60950-1, CAN/CSA-
C22.2-60950-1, IEC/EN 60950-1
Dimensions are in inches (mm shown for ref. only).
INPUT/OUTPUT CONNECTIONS
Pin
1
Function P85
Positive Vin
Third Angle Projection
2
Negative Vin
Positive Vout
Output Trim
3
SIDE VIEW
MOUNTING
PLANE
4
5
Negative Vout
On/Off Control*
8.1
0.32 MAX
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1ꢁ
6
*The Remote On/Off can be provided
with either positive (P suffix) or nega-
tive (N suffix) polarity
Components are shown for reference only.
.040 .002
.071 .002 SHOULDER
6X AT PINS 1-6
BOTTOM VIEW
END VIEW
C
L
#6
10.16
0.400
0.475
REF
#5
.30
#2
#1
#4
5.08
0.200
10.16
0.400
C
C
L
L
#3
10.16
0.400
0.41
2.54
0.100
0.15 TYP
6.3
0.25
RECOMMENDED
PRI-SEC BARRIER
0.58
20.32
0.800
Standard pin length is shown. Please refer to
the Ordering Guide for alternate pin lengths.
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20 Apr 2010 MDC_UEI15W.B37 Page 3 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MECHANICAL SPECIFICATIONS, SURFACE MOUNT PACKAGE
TOP VIEW
27.9
1.10
Dimensions are in inches (mm shown for ref. only).
INPUT/OUTPUT CONNECTIONS
Pin
1
Function P85
Positive Vin
Third Angle Projection
2
Negative Vin
Positive Vout
Output Trim
PIN #1
3
4
5
Negative Vout
On/Off Control*
24.4
0.96
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1ꢁ
6
*The Remote On/Off can be provided
with either positive (P suffix) or nega-
tive (N suffix) polarity
Components are shown for reference only.
SIDE VIEW
MOUNTING
PLANE
.093 TYP
BOTTOM VIEW
END VIEW
0.34
MAX
C
L
#6
10.16
0.400
#5
#2
#1
2.54
0.100
#4
10.16
0.400
C
C
L
L
#3
10.16
0.400
.093
2.54
0.100
20.32
0.800
0.13
REF
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20 Apr 2010 MDC_UEI15W.B37 Page 4 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MECHANICAL SPECIFICATIONS, SURFACE MOUNT PACKAGE
29.0
1.14
C
L
2.54
0.100
3
10.16
0.400
25.4
1.00
1
2
C
L
4
5
10.16
0.400
2.54
0.100
6
2.60 0.25
6X
.102 .010
20.32
0.800
RECOMMENDED SMT PAD LAYOUT
PACKAGING CONFORMS TO EIA-481
CONVERTERS SHIPPING IN QUANTITIES
OF 100 PER REEL
3.00
0.118
5.0mm PICK &
PLACE LOCATION
2.00
0.079
23.10
0.909
56.0
2.20
32.00
1.260
DIRECTION OF FEED
13.0
COVER TAPE
R.256
9.27
0.365
Dimensions in inches [mm]
SURFACE MOUNT TAPE AND REEL
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20 Apr 2010 MDC_UEI15W.B37 Page 5 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
INPUT CHARACTERISTICS
Under- Reflected
Recom-
mended
Standby Fast-blow
Input Current
Remote On/Off Control
Start-up voltage
threshold Shut-
(back)
Ripple
Internal Reverse
Negative Logic
"N" model
suffix
Inrush
Min. Output Short
Input
Filter
Type
Polarity On/Off Positive Logic
Protec- Current blank model
down
V
Current Transient Load
mA pk-pk
Circuit
mA
Low Line Mode
Fuse
A
Model Family
V
A2sec
mA
A
mA
tion
mA
suffix
18
9.1
8.6
15.6
8.5
100
30
1.86
1.04
1.90
0.96
2.04
1.02
2.13
1.06
4
2
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
16.7
9.5
C
L
OFF=open pin
or +10 to +
15V max.
ON=Gnd pin
or –0.7 to
None.
Install
external
fuse. See
note 15.
OFF=Gnd pin
or –0.7 to +0.8V
max. ON=open
pin or +10 to
+15V max.
105
130
110
15
4
16.7
9.5
15.6
8.4
2
30
0.05
50
1
1
4
16.7
9.5
15.6
8.4
1.5
4
C
+0.8V max.
130
20
16.7
16.2
2
OUTPUT CHARACTERISTICS
VOUT
IOUT
Accuracy Adjustment Temperature Capacitive Loading Max. Overvoltage protection
Max.
mA
50% Load
% of VNOM % of VNOM % of VOUT /ºC
Range
Coefficient
Low ESR <0.02Ω Max,
μF
Model Family
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
V
4.5
3.9
5.9
5.9
14.1
15
1,000
470
See
Ordering
Guide
1017
0.02
See ordering guide
Magnetic
feedback
1
18
20
ISOLATION CHARACTERISTICS
DYNAMIC CHARACTERISTICS
Dynamic Load
Isolation
Resistance
Min.
Start-up Time
VIN to VOUT regulated Remote On/Off to VOUT
Peak
Deviation
mV
Response
Input to
Output Min.
Isolation
Capacitance
pF
Isolation
Safety
Rating
Switching
Frequency
KHz
(50-75-50%
load step) μSec
to 1% VOUT ➀
(Max.) mSec
regulated max.) mSec
Model Family
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
Vdc
MΩ
Model Family
2000
2250
2000
2250
2000
2250
2000
2250
10
10
10
10
10
10
10
10
1000
1500
1500
1000
1000
1000
1500
1000
150
100
150
100
125
35
350
350
350
375
340
350
340
380
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
60
30
Basic
insulation
50
50
150
200
125
175
MISCELLANEOUS CHARACTERISTICS
Operating Temperature Range
Short Circuit
Duration
(output shorted
Current Limit
Inception 98% of
Vout, after warmup Protection Current
Short
Circuit
Short
Circuit
Storage
Temperature
Range
Thermal
Calculated
MTBF
Hours ④
Pre-
biased
setup
See
Derating
Curves
protection/
shutdown
ºC
Model Family
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
A
Method
A
to ground)➀
ºC
6.0
7.2
4.6
4.5
2.0
1.8
1.6
1.7
2 x 106
3.49 x 106
115
Current
limiting,
hiccup
2 x 106
0.3
Continuous
Monotonic
–40 to +85ºC
–55 to +125 ºC
autorestart
4.1 x 106
2.1 x 106
2 x 106
135
115
ꢀꢂRemove overload for recovery.
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20 Apr 2010 MDC_UEI15W.B37 Page 6 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
(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 load,
natural air convection.
ABSOLUTE MAXIMUM RATINGS
36 VDC
Volts Max. continuous
Volts, transient 100mS
Volts Max. continuous
Volts, transient 100mS
Volts, Min.
Q12 models
50 VDC
Input
Voltage
(5) The On/Off Control is normally controlled by a switch. But it may also be
driven with external 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.
75 VDC
Q48 models
100 VDC
–0.3
On/Off control,
referred to –VIN
15
See fuse section
VOUT nom. +20ꢀ
Current-limited, see specs
-55
Volts, Max.
(6) Output current limiting begins when the output voltage degrades
approximately 2ꢀ from the selected setting.
Input Reverse Polarity Protection
Output Overvoltage, Volts Max.
(7) The outputs are not intended to sink appreciable reverse current. This
may damage the outputs.
Output Current, sustained short circuit
Range, Min. ºC
Max. ºC
Storage Temperature
(8) Output noise may be further reduced by adding an external filter. See
I/O Filtering and Noise Reduction.
+125
(9) All models are fully operational and meet published specifications,
including “cold start” at –400 C.
Absolute Maximum Ratings
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 Specifi-
cations is neither implied nor recommended.
(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 after fault
removal. The overvoltage may occur either from internal failure or from an
external forcing voltage as in a shared power system.
SPECIFICATION NOTES
(1) All models are tested and specified with external capacitors listed in the
table below. The external capacitors listed below are ONLY for establishing test
specifications. They are required for our test fixtures and equipment. Your applica-
tion may not need them. The converter is stable with no external capacitors but
Murata Power Solutions strongly recommends external caps. All caps are low-ESR
types. Where two or more capacitors are listed, these are connected in parallel. All
caps should mount close to the DC/DC using short leads.
(12) Output current limit and short circuit protection is non-latching. When
the overcurrent fault is removed, the converter will immediately recover.
(13) Do not exceed maximum power specifications when adjusting the
output trim.
(14) At zero output current, the output may contain low frequency com-
ponents which exceed the ripple specification. The output may be operated
indefinitely with no load.
All specifications are typical unless noted. General conditions for Specifica-
tions are +25 deg.C, VIN=nominal, VOUT=nominal, full load. Adequate airflow
must be supplied for extended testing under power.
(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.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz band-
width. Input filtering is CIN=33 μF, 100V tantalum, CBUS=220 μF, 100V elec-
trolytic, LBUS=12 μH.
(16) “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 con-
verter immediately recovers normal operation.
(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.
(17) On model UEI15-050-Q48, if VIN <20V, output trim may only be adjusted
downwards from +5.0V (more negative).
INPUT/OUTPUT EXTERNAL TEST CAPACITORS
Model
Input Capacitor
100 μF
Output Capacitor(s)
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
1 μF & 10 μF
(18) Shown at Vin = 10V.
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
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. See fuse
information.
4.7 μF ceramic
100 μF
4.7 μF ceramic
100 μF
4.7 μF ceramic
100 μF
4.7 μF ceramic
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20 Apr 2010 MDC_UEI15W.B37 Page 7 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
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.
APPLICATION 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.
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
I/O Filtering, Input Ripple Current and Output Noise
If the input voltage polarity is reversed, an internal diode will become forward
biased and likely draw excessive current from the power source. If this source
is not current-limited or the circuit appropriately fused, it could cause perma-
nent damage to the converter.
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.
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.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capaci-
tor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the oper-
ating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
TO
CURRENT
PROBE
OSCILLOSCOPE
+INPUT
Start-Up Time
L
BUS
+
–
+
–
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.
VIN
CBUS
CIN
-INPUT
C
IN = 33μF, ESR < 700mΩ @ 100kHz
BUS = 220μF, ESR < 100mΩ @ 100kHz
C
LBUS = 12μH
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.
Figure 2. Measuring Input Ripple 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 figure 3, the two copper strips simulate real-world printed circuit imped-
ances 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.
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).
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable in-
put voltage regulation. Since real-world voltage sources have finite impedance, These leakages consist of both an AC stray capacitance coupling component
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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MPS 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 diffi-
cult to insert an anemometer to precisely measure airflow in most applications.
Sometimes it is possible to estimate the effective airflow if you thoroughly un-
derstand the enclosure geometry, entry/exit orifice areas and the fan flowrate
specifications. If in doubt, contact MPS to discuss placement and measurement
techniques of suggested temperature sensors.
COPPER STRIP
RLOAD
SCOPE
C1
C2
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.
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Output Overvoltage Protection
Figure 3 – Measuring Output Ripple and Noise (PARD)
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. The signal is optically coupled to the pri-
mary side PWM controller. 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 volt-
age to ramp up to its rated value. It is not necessary to power down and reset
the converter for the this automatic OVP-recovery restart.
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
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 damag-
ing the converter.
These converters employ a synchronous rectifier design topology. Models
UEI15-033-Q12, UEI15-120-Q12, and UEI15-050-Q12 require 10ꢀ minimum
load to meet specifications. Operation under less than 10ꢀ load may slightly
increase regulation, ripple, and noise.
Output Fusing
Thermal Shutdown
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.
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.
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.
Output Current Limiting
As soon as the output current increases to approximately 125ꢀ to 150ꢀ 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 com-
monly referred to as power limiting.
Temperature Derating Curves
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. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
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 temperature and/or current or reduced airflow as long as the aver-
age 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, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller. Following a time-out period,
the PWM will restart, causing the output voltage to begin ramping up to its ap-
propriate value. If the short-circuit condition persists, another shutdown cycle
will initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling
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 “natural convection” is defined as very flow rates which are not
using fan-forced airflow. Depending on the application, “natural convection” is
usually about 30-65 LFM but is not equal to still air (0 LFM).
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20 Apr 2010 MDC_UEI15W.B37 Page 9 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
reduces the average output current, thereby preventing excessive internal
temperatures. A short circuit can be tolerated indefinitely.
+OUTPUT
−INPUT
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 positive
or negative output 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.
ON/OFF
CONTROL
TRIM
LOAD
R TRIM UP
+INPUT
−OUTPUT
Figure 6 – Trim adjustments to increase Output Voltage using a Fixed Resistor
+OUTPUT
−INPUT
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.
5-22
TURNS
ON/OFF
CONTROL
Trim Equations
LOAD
TRIM
Trim Up
Trim Down
<Connect trim
resistor between
Trim and +VOUT>
<Connect trim
resistor between
Trim and −VOUT>
+INPUT
−OUTPUT
UEI15-033-Q12, Q48
UEI15-050-Q12, Q48
Figure 4 – Trim adjustments using a trimpot
12775
5110 (Vo - 2.5)
– 2050
– 2050
– 2050
RTUP (ꢀ) =
RTDOWN (ꢀ) =
VO – 3.3
3.3 – VO
+OUTPUT
12775
5110 (Vo - 2.5)
−INPUT
– 2050
UEI15-120-Q12, Q48
– 5110
UEI15-150-Q12, Q48
RTDOWN (ꢀ) =
RTDOWN (ꢀ) =
RTUP (ꢀ) =
VO – 5
5 – VO
10000 (Vo-2.5)
25000
ON/OFF
TRIM
LOAD
– 5110
– 5110
RTUP (ꢀ) =
RTUP (ꢀ) =
RTDOWN (ꢀ) =
12 – VO
CONTROL
R
TRIM DOWN
VO – 12
10000 (Vo-2.5)
25000
– 5110
15 – VO
VO – 15
−OUTPUT
+INPUT
Figure 5 – Trim adjustments to decrease Output Voltage using a Fixed Resistor
Where Vo = Desired output voltage. Adjustment accuracy is subject to resis-
tor tolerances and factory-adjusted output accuracy. Mount trim resistor close
to converter. Use short leads.
There are two CAUTIONs to be aware 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 overtem-
perature shut down.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Positive-polarity models are enabled when the On/Off pin is left open or is
pulled high to +15V max. with respect to –VIN. Some models will also turn on at
lower intermediate voltages (see Specifications). Positive-polarity devices are
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20 Apr 2010 MDC_UEI15W.B37 Page 10 of 14
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
disabled when the On/Off is grounded or brought to within a low voltage (see
Specifications) with respect to –VIN.
+ Vcc
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 +15VDC
max. with respect to –VIN.
ON/OFF CONTROL
CONTROL
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.
-INPUT
Figure 7 – Driving the On/Off Control Pin (suggested circuit)
There are three CAUTIONs for the On/Off Control:
CAUTION: To retain full output circuit isolation, control the On/Off from the in-
put side ONLY. If you must control it from circuits in the output, use some form
of optoisolation to the On/Off Control. This latter condition is unlikely because
the device controlling the On/Off would have to remain powered on and not be
powered from the converter.
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 dif-
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).
fer; 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:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
270° C.
7 seconds
On/Off Enable Control Ground Bounce Protection
105° C.
To improve reliability, if you use a small signal transistor or other external
circuit to select the Remote On/Off control, make sure to return the LO side
directly to the –Vin power input on the DC/DC converter. To avoid ground
bounce errors, do not connect the On/Off return to a distant ground plane or
current-carrying bus. If necessary, run a separate small return wire directly to
the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off
control however, large current changes on a return ground plane or ground bus
can accidentally trigger the converter on or off. If possible, mount the On/Off
transistor or other control circuit adjacent to the converter.
250° C.
6 seconds
DC/DC Converter
+ Vin
Preferred location
of On/Off control
adjacent to -Vin
terminal
On/Off Enable
-Vin return
On/Off
Control
Transistor
Ground plane or power return bus
Install separate
return wire for
On/Off control
with remote
transistor
Do not connect
control transistor
through remote
power bus
Figure 8 – On/Off Enable Control Ground Bounce Protection
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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE DATA
UEI15-033-Q12
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @sea level
(VIN = 12V or 24V, airflow from input to output)
90
85
80
75
70
65
60
55
50
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
Vin = 36 V
Vin = 24 V
Vin = 18 V
Vin = 9 V
Natural Convection
0
0.5
1
1.5
2
2.5
3
3.5
4
40
45
50
55
60
65
70
75
80
85
Ambient temperature (°C)
Load Current (Amps)
UEI15-033-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @sea level
(VIN = 24V, airflow from input to output)
90
85
80
75
70
65
60
55
50
5 10
4 90
4 70
4 50
4 30
4 10
3 90
3 70
3.50
Natural Convection
100 LFM
200 LFM
300 LFM
Vin = 75 V
Vin = 48 V
Vin = 18 V
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
1
2
3
4
5
Load Current (Amps)
UEI15-033-Q48
Maximum Current Temperature Derating @sea level
(VIN = 48V, airflow from input to output)
5 20
5.00
4.80
4.60
4.40
4 20
4.00
3 80
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
40
45
50
55
60
65
70
75
80
85
Ambient temperature (°C)
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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE DATA
UEI15-050-Q12
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 24V, airflow is from pin 1 to pin 3)
100
90
80
70
60
50
40
30
20
10
4
3
2
1
0
65 LFM
Vin = 36 V
Vin = 24 V
Vin = 18 V
Vin = 9 V
20 25 30 35 40 45 50 55 60 65 70 75 80 85
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
3
Ambient Temperature (°C)
Load Current (Amps)
UEI15-050-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 24V or 48V, airflow is from input to output)
100
3.20
3.10
3.00
90
80
70
60
50
40
30
20
10
0
Natural Convection
2.90
Vin = 75 V
Vin = 36 V
Vin = 24 V
Vin = 18 V
2.80
2.70
2.60
2.50
40
45
50
55
60
65
70
75
80
85
0
0.5
1
1.5
2
2.5
3
Ambient Temperature (°C)
Load Current (Amps)
UEI15-120-Q12
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 24V, airflow is from pin 1 to pin 3)
90
85
80
75
70
65
60
1.5
1
65 LFM
Vin = 36 V
Vin = 24 V
Vin = 18 V
Vin = 9 V
0.5
0
20 25 30 35 40 45 50 55 60 65 70 75 80 85
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1 1.1 1.2 1.3
Ambient Temperature (°C)
Load Current (Amps)
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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE DATA
UEI15-120-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 24V or 48V, airflow is from pin 2 to pin 1)
90
88
86
84
82
80
78
76
74
72
70
1.3
Natural Convection
1.2
Vin = 75 V
Vin = 48 V
Vin = 24 V
Vin = 18 V
1.1
1.0
0.9
0.8
0.7
0.6
0.5
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
Load Current (Amps)
UEI15-150-Q12
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 12V and 24V, airflow is from input to output)
90
88
86
84
82
80
78
76
74
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
Natural Convection
Vin = 36 V
Vin = 24 V
Vin = 9 V
40
45
50
55
60
65
70
75
80
85
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Ambient Temperature (°C)
Load Current (Amps)
UEI15-150-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
Maximum Current Temperature Derating @Sea Level
(VIN = 24V and 48V, airflow is from input to output)
95
90
85
80
75
70
65
60
1.15
1.10
1.05
1.00
0.95
0.90
0.85
Natural Convection
Vin = 75 V
Vin = 48 V
Vin = 24 V
Vin = 18 V
0.80
0.07
0.18
0.28
0.38
0.49
0.59
0.69
0.80
0.90
1.00
1.10
40
45
50
55
60
65
70
75
80
85
Load Current (Amps)
Ambient Temperature (°C)
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.
© 2010 Murata Power Solutions, Inc.
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email: sales@murata-ps.com
20 Apr 2010 MDC_UEI15W.B37 Page 14 of 14
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