MURATA UEI-15

UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
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.
Typical unit
FEATURES
PRODUCT OVERVIEW
n
Small footprint DC/DC converter, ideal for
high current applications
Wide range 4:1 inputs on the 0.9" x 1.1" x 0.335"
converter are either 9 to 36 Volts DC (Q12 models)
or 18 to 75 Volts DC (Q48 models), ideal for batterypowered and telecom equipment. The industrystandard pinout fits larger 1" x 2" converters. Fixed
output voltages from 3.3 VDC to 15 VDC are regulated to within ±0.2% or less and may be trimmed
within ±10% of nominal output. Applications
include small instruments, area-limited microcontrollers, computer-based systems, data communications equipment, remote sensor systems, vehicle
and portable electronics.
The UEI 15W series includes full magnetic and
optical isolation up to 2250 Volts DC (basic insulation). For connection to digital systems, the outputs
offer fast settling to current step loads and tolerance of higher capacitive loads. Excellent ripple
n
Industry standard 0.9" x 1.1" X 0.335"
open frame package and pinout
n
Wide range input voltages 9-36 and
18-75 Vdc
n
Double lead-free assembly and attachment
for RoHS standards
n
Isolation up to 2250 VDC (basic)
n
Up to 15 Watts or greater total output
power with overtemperature shutdown
n
High efficiency synchronous rectifier
forward topology
n
Stable no-load operation with no required
external components
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, transistor 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 overtemperature 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.
The high efficiency offers minimal heat buildup
and “no fan” operation.
n
Usable -40 to 85°C temperature range
(with derating)
n
Designed to meet UL 60950-1, CAN/CSAC22.2 No. 60950-1, IEC60950-1,
EN60950-1 safety approvals
SIMPLIFIED SCHEMATIC
+VOUT
+VIN
n
Extensive self-protection shut down
features
–VOUT
On/Off
Control
Control
GATE DRIVE
ISOLATION BARRIER
−VIN
ISOLATION
Reference, Trim &
Error Amplifier
TRIM
3.3V and 5Vout models only.
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 1 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE ➀
Output
Input
R/N (mVp-p) ➁ Regulation (Max.)
Root Models ➀
Vout Iout Power
(V) (A) (W)
Typ.
Max.
Line
Load
Iin =
Vin
no
Nom. Range load
(V)
(V) (mA)
Efficiency
Iin =
full
load
(A)
Min.
Typ.
89%
UEI15-033-Q12P-C
3.3
4.5
14.85
60
90
±0.05%
±0.1%
24
9-36
43
0.71
86.5%
UEI15-033-Q48N-C
3.3
5
16.5
60
90
±0.2%
±0.2%
48
18-75
24
0.4
86.5% 88.8%
UEI15-050-Q12P-C
5
3
15
70
125
±0.05% ±0.075%
24
9-36
41
0.72
86.3% 87.3%
UEI15-050-Q48N-C
5
3
15
60
95
±0.05% ±0.06%
48
18-75
28
0.36
84.3% 86.0%
UEI15-120-Q12P-C
12
1.3
15.6
110
150
±0.05% ±0.05%
24
9-36
15
0.77
82.3% 84.5%
UEI15-120-Q48N-C
12
1.3
15.6
85
120
±0.075% ±0.05%
48
18-75
15
0.76
83.3%
85%
UEI15-150-Q12P-C
15
1.1
16.5
130
175
±0.05% ±0.05%
24
9-36
18
0.81
83.5%
85%
UEI15-150-Q48N-C
15
1.1
16.5
80
120
±0.05% ±0.05%
48
18-75
14
0.4
83.3% 85.3%
➀ Please refer to the part number structure for additional options and complete ordering part
numbers.
➁ All specifications are typical at nominal line voltage and full load, +25 deg.C. unless otherwise
noted. See detailed specifications.
Package – C75
(inches)
(mm)
1.1×0.9×0.335 27.94×22.86×8.51
Case
Pinout
P22
 Minimum output load for UEI15-033-Q12, UEI15-120-Q12 and UEI15-050-Q12 is 10% of
maximum current.
PART NUMBER STRUCTURE
UEI15 - 033 - Q12
Unipolar Wide Input
15-Watt Series
Nominal Output Voltage
in Tenths of a Volt
P-C
RoHS-6 Hazardous
Substance Compliance
On/Off Control Polarity:
P = Positive
N = Negative
Input Voltage Range
Q12 = 9-36V
Q48 = 18-75V
www.murata-ps.com
Note:
Some model number combinations
may not be available.
Contact Murata Power Solutions.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 2 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS
Top View
Case 75
Pin
Function P22
1
Positive Input
2
Negative Input
3
On/Off Control In
1.10 (27.9)
Pin # 1
0.96
(24.4)
Pin
4
Function P22
Positive Output
5
Trim
6
Negative Output
PHYSICAL CHARACTERISTICS
Pin Material
Pin Diameter
Pin Finish
Weight
Electromagnetic Interference
Flammability Rating
Side View
Safety (designed to meet)
0.36
(9.1)
Copper alloy
0.04" (1.016mm)
Gold plate
0.352 oz./10 grams
FCC part 15, class B, EN55022
UL 94V-0
UL/cUL 60950-1, CAN/CSAC22.2-60950-1, IEC/EN 60950-1
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Ø 0.40±0.002 Pin with
Ø 0.062±0.002 shoulder
6x at pins 1-6
Bottom View
0.400 (10.16)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
End View
#3
#6
0.300
(7.62)
#5
Components are shown for reference only.
0.200
(5.08)
CL
#4
#2
#1
0.400
(10.16)
0.15
(3.8)
0.800
(20.32)
www.murata-ps.com
0.19
(4.8)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 3 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
INPUT CHARACTERISTICS
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
UnderStart-up voltage
threshold Shutdown
V
V
Reflected
(back)
Ripple
Current mA pk-pk
Input Current
Inrush
Transient
A2sec
Output Short
Standby
Circuit
Low Line Mode
mA
A
mA
9.5
8.6
1.86
4
16.7
15.6
1.04
2
9.5
8.5
1.90
4
16.7
15.6
9.5
16.7
9.5
16.7
8.4
15.6
8.4
16.2
30
0.05
50
0.96
1
2.04
1.02
2.13
1.06
Remote On/Off Control
Internal Reverse
Input
Polarity On/Off Positive Logic Negative Logic
"N" model
Filter
Protec- Current blank model
Type
tion
mA
suffix
suffix
Recommended
Fuse
A
C
2
L
4
1.5
4
2
C
None see note
15
1
OFF=Gnd pin
or –0.7 to +1.2V
max. ON=open
pin or +5.8 to
+15V max.
OFF=open pin
or +5.8 to +
15V max.
ON=Gnd pin
or –0.7 to
+1.2V max.
Model Family
Efficiency
Line/Load
Regulation
Ripple/Noise
(20 MHz
bandwidth)8
V
4.5
1,000
3.9
5.9
See
Ordering
Guide
±1
±10
17
5.9
±0.02
14.1
470
Magnetic
feedback
See ordering guide
15
18
20
ISOLATION CHARACTERISTICS
UEI15-033-Q12
UEI15-033-Q48
UEI15-050-Q12
UEI15-050-Q48
UEI15-120-Q12
UEI15-120-Q48
UEI15-150-Q12
UEI15-150-Q48
Overvoltage protection
Voltage Output Range
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
Vout
Capacitive Loading Max.
Accuracy Adjustment Temperature Low ESR <0.02Ω Max,
50% Load
Range
Coefficient
resistive load
% of Vnom % of Vnom % of Vout /ºC
µF
Iout
Max.
mA
OV
protection
method
OUTPUT CHARACTERISTICS
DYNAMIC CHARACTERISTICS
Input to
Output Min.
Vdc
Isolation
Resistance
Min.
MΩ
Isolation
Capacitance
pF
2000
10
1000
2250
10
1500
2000
10
1500
2250
10
1000
2000
10
1000
2250
10
1000
2000
10
1500
2250
10
1000
Isolation
Safety
Rating
Basic
insulation
Dynamic Load
Response
(50-75-50% load
step) µSec
to 1% Vout
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
Start-up Time
Switching
Vin to Vout regulated Remote On/Off to Vout Frequency
(Max.) mSec
regulated max.) mSec
KHz
350
350
100
150
350
50
50
375
340
350
100
340
380
MISCELLANEOUS CHARACTERISTICS
Model Family
Current Limit
Short
Inception 98% of
Circuit
Vout, after warmup Protection
A
Method
Short
Circuit
Current
A
Short Circuit
Duration
(output shorted
to ground)➀
Operating Temperature Range
Prebiased
setup
Calculated
MTBF
Hours ④
UEI15-033-Q12
6.0
2 x 106
UEI15-033-Q48
7.2
3.49 x 106
UEI15-050-Q12
4.6
UEI15-050-Q48
4.5
UEI15-120-Q12
2.0
UEI15-120-Q48
1.8
UEI15-150-Q12
1.6
2.1 x 10
UEI15-150-Q48
1.7
2 x 106
Current
limiting,
hiccup
autorestart
See
Derating
Curves
Storage
Temperature
Range
ºC
Thermal
protection/
shutdown
ºC
115
0.3
Continuous
Monotonic
2 x 106
–40 to +85ºC
with derating
4.1 x 106
–55 to +125 ºC
135
6
115
Remove overload for recovery.
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 4 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
ABSOLUTE MAXIMUM RATINGS
Q12 models
Input
Voltage
Q48 models
Volts Max. continuous
36 VDC
Volts, transient 100mS
50 VDC
Volts Max. continuous
75 VDC
Volts, transient 100mS
100 VDC
Volts, Min.
–0.3
On/Off control,
referred to –Vin
Volts, Max.
15
Input Reverse Polarity Protection
See fuse section
Output Overvoltage, Volts Max.
Vout nom. +20%
Output Current, sustained short circuit
Storage Temperature
Current-limited, see specs
Range, Min. ºC
-55
Max. ºC
+125
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 Specifications is neither implied nor recommended.
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 application 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.
All specifications are typical unless noted. General conditions for Specifications are +25 deg.C, Vin=nominal, Vout=nominal, full load. Adequate airflow
must be supplied for extended testing under power.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=33 µF, 100V tantalum, Cbus=220 µF, 100V electrolytic, Lbus=12 µH.
(3) Note that Maximum Power Derating curves indicate an average current at
nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC
converter will tolerate brief full current outputs if the total RMS current over time
does not exceed the Derating curve. All Derating curves are presented at sea level
altitude. Be aware of reduced power dissipation with increasing density altitude.
INPUT/OUTPUT EXTERNAL TEST CAPACITORS
Model
Input Capacitor
Output Capacitor(s)
UEI15-033-Q12
100 µF
1 µF & 10 µF
UEI15-033-Q48
4.7 µF ceramic
1 µF & 10 µF
UEI15-050-Q12
100 µF
1 µF & 10 µF
UEI15-050-Q48
4.7 µF ceramic
1 µF & 10 µF
UEI15-120-Q12
100 µF
1 µF & 10 µF
UEI15-120-Q48
4.7 µF ceramic
1 µF & 10 µF
UEI15-150-Q12
100 µF
1 µF & 10 µF
UEI15-150-Q48
4.7 µF ceramic
1 µF & 10 µF
www.murata-ps.com
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25 deg.C, full load,
natural air convection.
(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.
(6) Output current limiting begins when the output voltage degrades
approximately 2% from the selected setting.
(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 –400 C. At full power, the package temperature of all
on-board components must not exceed +128°C.
(10) Regulation specifications describe the deviation as the line input voltage
or output load current is varied from a nominal midpoint value to either extreme.
(11) The output overvoltage protection is automatic recovery after fault
removal. The overvoltage may occur either from internal failure or from an
external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When
the overcurrent fault is removed, the converter will immediately recover.
(13) Do not exceed maximum power specifications when adjusting the
output trim.
(14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated
indefinitely with no load.
(15) 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 output load, always connect an external input
fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage.
(16) “Hiccup” operation repeatedly attempts to restart the converter with
a brief, full-current output. If the overcurrent condition still exists, the restart
current will be removed and then tried again. This short current pulse prevents
overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation.
(17) On model UEI15-050-Q48, if Vin <20V, output trim may only be adjusted
downwards from +5.0V (more negative).
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.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 5 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
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. We
recommend a time delay 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.
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 diode will become forward
biased and likely draw excessive current from the power source. If this source
is not current-limited or the circuit appropriately fused, it could cause permanent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). Once operating, converters will not
turn off until the input voltage drops below the Under-Voltage Shutdown Limit.
Subsequent restart will not occur until the input voltage rises again above the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the VIN to VOUT
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final value of the input voltage as it
appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to VOUT regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to VOUT regulated specification
such as external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance,
performance is improved by adding external filter components. Sometimes only
a small ceramic capacitor is sufficient. Since it is difficult to totally characterize
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
Because of the switching nature of DC/DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifies that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (Cin in the figure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the figure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Your specific
system configuration may require additional considerations. Please note that the
values of Cin, Lbus and Cbus will vary according to the specific converter model.
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.
TO
OSCILLOSCOPE
VIN
+
–
+
–
CURRENT
PROBE
+INPUT
LBUS
CBUS
CIN
-INPUT
CIN = 33µF, ESR < 700mΩ @ 100kHz
CBUS = 220µF, ESR < 100mΩ @ 100kHz
LBUS = 12µH
Figure 2. Measuring Input Ripple Current
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 6 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
In figure 3, 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.
COPPER STRIP
C1
C2
SCOPE
RLOAD
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in 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 average is not exceeded.
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.
COPPER STRIP
C1 = 0.1µF CERAMIC
C2 = 10µF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3 – Measuring Output Ripple and Noise (PARD)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifications).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed specifications. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
Minimum Output Loading Requirements
These converters employ a synchronous rectifier design topology. All models
regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple
and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling. The temperature sensor is typically
located adjacent to the switching controller, approximately in the center of the
unit. See the Performance and Functional Specifications.
www.murata-ps.com
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 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. If in doubt, contact MPS to discuss placement and measurement
techniques of suggested temperature sensors.
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Output Overvoltage Protection
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. The signal is optically coupled to the primary 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 voltage 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.
If the fault condition persists and the output voltage climbs to excessive levels,
the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred
to as “hiccup” mode. It safely tests full current rated output voltage without damaging the converter.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 7 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
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 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. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as
the output current demand increases. If the output voltage drops too low, 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 appropriate value. If the short-circuit condition persists, another shutdown cycle
will initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling
reduces the average output current, thereby preventing excessive internal
temperatures. A short circuit can be tolerated indefinitely.
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage
over the rated trim range (please refer to the Specifications). In the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or
a single fixed resistor connected between the Trim input and either the 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.
−INPUT
ON/OFF
CONTROL
+INPUT
+OUTPUT
7 5-22
TURNS
TRIM
LOAD
−OUTPUT
Figure 4 – Trim adjustments using a trimpot
−INPUT
ON/OFF
CONTROL
+INPUT
+OUTPUT
TRIM
RTRIM DOWN
LOAD
−OUTPUT
Figure 5 – Trim adjustments to decrease Output Voltage using a Fixed Resistor
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 overtemperature shut down.
CAUTION: Be careful of external electrical noise. The Trim input is a senstive
input to the converter’s feedback control loop. Excessive electrical noise may
cause instability or oscillation. Keep external connections short to the Trim
input. Use shielding if needed.
−INPUT
ON/OFF
CONTROL
+INPUT
+OUTPUT
TRIM
R TRIM UP
LOAD
−OUTPUT
Figure 6 – Trim adjustments to increase Output Voltage using a Fixed Resistor
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 8 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
Trim Equations
Trim Up
Trim Down
<Connect trim
resistor between
Trim and −VOUT>
<Connect trim
resistor between
Trim and +VOUT>
+ Vcc
ON/OFF CONTROL
CONTROL
UEI15-033-Q12, Q48
RTUP (Ω) =
12775
VO – 3.3
– 2050
RTDOWN (Ω) =
5110 (Vo - 2.5)
3.3 – VO
– 2050
-INPUT
UEI15-050-Q12, Q48
RTUP (Ω) =
12775
VO – 5
– 2050
RTDOWN (Ω) =
5110 (Vo - 2.5)
5 – VO
– 2050
Figure 7 – Driving the On/Off Control Pin (suggested circuit)
UEI15-120-Q12, Q48
RTUP (Ω) =
25000
VO – 12
– 5110
RTDOWN (Ω) =
10000 (Vo-2.5)
12 – VO
– 5110
UEI15-150-Q12, Q48
RTUP (Ω) =
25000
VO – 15
– 5110
RTDOWN (Ω) =
10000 (Vo-2.5)
15 – VO
– 5110
Where Vo = Desired output voltage. Adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. Mount trim resistor close
to converter. Use short leads.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
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 +VIN. 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.
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 +15Vdc max. with respect to –VIN.
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.
www.murata-ps.com
There are three CAUTIONs for the On/Off Control:
CAUTION: To retain full output circuit isolation, control the On/Off from the input 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.
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). The On/Off prefers to be set at +VIN (open pin) for the
ON state, assuming positive logic.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
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 (100° C. 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
115° C.
Maximum Pot Temperature
270° C.
Maximum Solder Dwell Time
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
6 seconds
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 9 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ 25°C
UEI15-033-Q12
90
5.5
85
5.0
80
Output Current (Amps)
Efficiency (%)
4.5
Vin = 36 V
75
Vin = 24 V
70
Vin = 18 V
Vin = 9 V
65
Maximum Current Temperature Derating @sea level
(Vin = 12V or 24V, airflow from input to output)
60
Natural Convection
4.0
3.5
3.0
2.5
55
50
0
0.5
1
1.5
2
2.5
3
3.5
2.0
4
40
45
50
55
60
Efficiency vs. Line Voltage and Load Current @ 25°C
UEI15-033-Q48
90
5.10
85
4.90
Output Current (Amps)
Vin = 48 V
Vin = 18 V
65
80
85
80
85
4.30
4.10
3.90
60
3.70
55
3.50
50
75
Natural Convection
100 LFM
200 LFM
300 LFM
4.50
40
45
50
55
60
65
70
75
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
Output Current (Amps)
Efficiency (%)
Vin = 75 V
70
70
Maximum Current Temperature Derating @sea level
(Vin = 24V, airflow from input to output)
4.70
80
75
65
Ambient temperature (°C)
Load Current (Amps)
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
4.80
4.60
4.40
4.20
4.00
3.80
40
45
50
55
60
65
70
75
80
85
Ambient temperature (°C)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 10 of 13
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
100
Maximum Current Temperature Derating @sea level
(Vin = 12 or 24V, airflow from input to output)
3.2
90
3.0
Natural Convection
70
60
Output Current (Amps)
Vin = 36 V
Vin = 24 V
50
Vin = 18 V
40
Vin = 9 V
30
20
2.8
2.6
2.4
2.2
10
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
2.75
3
2.0
40
Load Current (Amps)
45
50
55
60
65
70
75
80
85
Ambient temperature (°C)
UEI15-050-Q48
Efficiency vs. Line Voltage and Load Current @ 25°C
100
90
80
70
60
50
40
30
20
10
0
Maximum Current Temperature Derating @Sea Level
(Vin = 24V or 48V, airflow is from input to output)
3.20
Output Current (Amps)
Efficiency (%)
3.10
Vin = 75 V
Vin = 36 V
Vin = 24 V
Vin = 18 V
3.00
Natural Convection
2.90
2.80
2.70
2.60
2.50
0
0.5
1
1.5
2
2.5
40
3
45
50
55
60
65
70
75
80
85
80
85
Ambient Temperature (°C)
Load Current (Amps)
Efficiency vs. Line Voltage and Load Current @ 25°C
UEI15-120-Q12
90
70
65
Vin = 36 V
Vin = 24 V
Vin = 18 V
Vin = 9 V
Output Current (Amps)
1.20
80
75
Maximum Current Temperature Derating @Sea Level
(Vin = 12V or 24V, airflow is from pin 2 to pin 1)
1.30
85
Efficiency (%)
Efficiency (%)
80
Natural Convection
1.10
1.00
0.90
0.80
0.70
0.60
0.50
60
40
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
45
50
55
60
65
70
75
Ambient Temperature (°C)
Load Current (Amps)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 11 of 13
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
1.3
86
Vin = 75 V
Vin = 48 V
Vin = 24 V
Vin = 18 V
82
80
1.1
Output Current (Amps)
Efficiency (%)
Natural Convection
1.2
84
78
76
1.0
0.9
0.8
0.7
0.6
74
0.5
72
40
45
50
70
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
55
60
65
70
75
80
85
Ambient Temperature (°C)
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
1.15
86
1.10
Output Current (Amps)
88
Efficiency (%)
84
82
Vin = 36 V
Vin = 24 V
Vin = 9 V
80
78
76
Natural Convection
1.05
1.00
0.95
0.90
0.85
74
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0.80
1.1
40
45
50
Load Current (Amps)
55
60
65
70
75
80
85
80
85
Ambient Temperature (°C)
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
1.15
90
Output Current (Amps)
1.10
Efficiency (%)
85
80
75
Vin = 75 V
Vin = 48 V
Vin = 24 V
Vin = 18 V
70
65
0.18
0.28
0.38
0.49
0.59
0.69
0.80
1.00
0.95
0.90
0.85
60
0.07
Natural Convection
1.05
0.90
1.00
1.10
Load Current (Amps)
0.80
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 12 of 13
UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
Murata Power Solutions, Inc.
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: [email protected] ISO 9001 and 14001 REGISTERED
11/17/08
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. © 2008 Murata Power Solutions, Inc.
www.murata-ps.com
USA:
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada:
Toronto, Tel: (866) 740-1232, email: [email protected]
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany:
München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
China: Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Singapore: Parkway Centre, Tel: +65 6348 9096, email: [email protected]
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UEI15W.B21 Page 13 of 13