MURATA-PS UEI-3.3/18-Q48NR-C

UEI Series
www.murata-ps.com
50-60W Isolated Wide-Range DC/DC Converters
Featuring a full 50-60 Watt output in 2.9 square inches of board area,
the UEI series isolated DC/DC converter family offers efficient
regulated DC power for printed circuit board mounting.
PRODUCT OVERVIEW
Typical unit
FEATURES
„
Small footprint DC/DC converter, ideal for high
current applications
„
Industry standard 1.50˝ x 1.90˝ x 0.38˝ open
frame package and pinout
„
Wide range input voltages 9-36 and 18-75Vdc
„
Assembly and attachment for RoHS standards
„
Isolation up to 2250 VDC (basic)
„
Up to 50-60W total output power with
overtemperature shutdown
„
High efficiency synchronous rectifier forward
topology
„
Stable no-load operation with no required
external components
Wide range 4:1 inputs on the 1.50" x 1.90" x
0.38" 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.
Fixed output voltages from 3.3 VDC to 15 VDC are
regulated to within ±0.05% and may be trimmed
within ±10% of nominal output. Applications
include small instruments, computer-based
systems, data communications equipment, remote
sensor systems, vehicle and portable electronics.
logic and FPGA’s. No minimum load is required.
For systems requiring controlled startup/shutdown, an external switch, transistor or digital logic
may be used to activate the remote On/Off control.
Remote Sense inputs compensate for resistive line
drops at high currents.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout, input overvoltage 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 synchronous rectifier forward topology offers
high efficiency for minimal heat buildup and “no
fan” operation.
The UEI 50-60W 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 and noise specifications assure compatibility to circuits using CPU’s, ASIC’s, programmable
„
–40 to +85°C temperature range with derating
„
Meets UL60950-1, CSA-C22.2 No. 234,
EN60950-1, 2nd Edition safety approvals
„
Extensive self-protection shut down features
„
RoHS-6 compliant
SIMPLIFIED SCHEMATIC
+VOUT
+VIN
GATE
DRIVE
–VIN
–VOUT
ISOLATION
BARRIER
+SENSE
On/Off
Control
Control
OPTO
ISOLATION
Reference, trim &
Error Amplifier
TRIM
–SENSE
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
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email: [email protected]
27 May 2010
MDC_UEI Series 50-60W.B31 Page 1 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Output
Power
R/N (mVp-p) Regulation (Max.)
VIN
VOUT IOUT
Nom.
(V)
(A)
(W)
Typ.
Max.
Line
Load
(V)
Root Modelc
Input
Range
(V)
IIN,
no load
(mA)
Package
Efficiency
IIN, full
load (A)
Min.
Typ.
Sense
Input
Case
Pinout
UEI-3.3/15-Q12PR-C
3.3
15.0
49.5
15
30
±0.05% ±0.06%
24
9-36
130
2.33
86.8%
88.5%
yes
C74
P52
UEI-3.3/18-Q48NR-C
3.3
18.0
59.4
60
125
±0.075% ±0.2%
48
18-75
130
1.38
87%
89.5%
yes
C74
P52
5
10.0
50.0
35
50
±0.1%
24
9-36
130
2.31
89%
90%
yes
C74
P52
UEI-5/12-Q48NR-C
5
12.0
60.0
70
100
±0.1% ±0.15%
48
18-75
130
1.37
89.5%
91%
yes
C74
P52
UEI-12/4.2-Q12P-C
12
4.2
50.4
50
120
±0.05% ±0.05%
24
9-36
130
2.35
87.8%
89.5%
no
C74
P51
UEI-12/5-Q48N-C
12
5.0
60.0
40
70
±0.05% ±0.05%
48
18-75
130
1.42
87%
89.8%
no
C74
P51
UEI-15/3.3-Q12P-C
15
3.3
49.5
30
100
±0.075% ±0.05%
24
9-36
130
2.29
88.3%
90%
no
C74
P51
UEI-15/4-Q48N-C
15
4.0
60.0
35
60
±0.075% ±0.05%
48
18-75
50
1.40
87.5%
89.3%
no
C74
P51
UEI-5/10-Q12PR-C
±0.1%
c These are partial model numbers. Please refer to the full model number structure for complete
ordering part numbers.
d Sense input is not included for 12 VOUT and higher models. Sense is optional for 5 VOUT and lower.
e All specifications are typical at nominal line voltage and full load, +25 deg.C. unless otherwise
noted. See detailed specifications.
f Output capacitors are 1 μF ceramic || 10 μF electrolytic. Input cap is 22 μF, low ESR.
g I/O caps are necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
UEI - 3.3 / 15 - Q12 P R - C
RoHS-6 Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
Nominal Output Voltage
Sense Inputs (5 VOUT and lower):
R = Sense included as standard (for 5 VOUT
and lower models only. 12 VOUT and higher
models do not offer the sense option.)
Blank = Sense not installed for 5 VOUT and
lower models. Pins 5 and 8 omitted.
Maximum Rated Output
Current in Amps
Input Voltage Range:
Q12 = 9-36V
Q48 = 18-75V
On/Off Control Polarity:
P = Positive
N = Negative
Positive “P” polarity is standard for Q12 models and optional special
order for Q48 models. Negative “N” polarity is standard for Q48
models and optional special order for Q12 models.
Note:
Not all model number combinations are
available. Contact Murata Power Solutions.
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
For Sn/Pb based solders:
Maximum Preheat Temperature
115° C.
Maximum Preheat Temperature
105° C.
Maximum Pot Temperature
270° C.
Maximum Pot Temperature
250° C.
Maximum Solder Dwell Time
7 seconds
Maximum Solder Dwell Time
6 seconds
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email: [email protected]
27 May 2010
MDC_UEI Series 50-60W.B31 Page 2 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS, WITH SENSE
Pin
1
2
3
4
Function P52
Positive Input
Negative Input
No pin
On/Off Control In
Pin
5
6
7
8
9
INPUT/OUTPUT CONNECTIONS, WITHOUT SENSE
Function P52
+Sense In
Positive Output
No pin
Negative Output
–Sense In
Trim
Pin
1
2
3
4
Function P51
Pin
5
6
Positive Input
Negative Input
No pin
On/Off Control In
Function P51
No pin
Positive Output
No pin
Negative Output
No pin
Trim
7
8
9
Pins 5 and 8 are omitted for models without sense inputs.
Important: If sense inputs are not connected to a remote load, connect them
to their respective VOUT pins at the converter.
PHYSICAL CHARACTERISTICS
Outline dimensions
Pin diameter
See mechanical specs
Copper alloy with gold plate over
nickel underplate
0.04" (1mm)
Pin Finish
Gold plate
Weight
1 oz (28.5g)
Meets class B, EN55022 (requires
external filter)
UL 94V-0
Meets IEC/EN/UL/cUL 60950-1, CSAC22.2 No. 60950-1, 2nd Edition
Pin material
Electromagnetic interference
Flammability Rating
Safety
TOP VIEW
1.90
(48.3)
9
4
8
7
2
1
1.50 (38.1)
6
5
SIDE VIEW
.188
4.78
0.38 (9.7)
Dimensions are in inches (mm shown for ref. only).
BOTTOM VIEW
CL
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
.010 MIN
0.25 MIN
CLEARANCE
.040±.002 PINS
1.02±0.05
Third Angle Projection
.900
22.86
.100
2.54
.200
5.08
.100
2.54
5
CL
.500
12.70
.400
10.16
6
1
.400
10.16
7
2
8
4
9
.600
15.24
CL
.200
5.08
CL
0.05 (1.3)
1.800
45.72
0.05 (1.3)
UEI50 Open Frame
50-60W
Case C74
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27 May 2010
MDC_UEI Series 50-60W.B31 Page 3 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
INPUT CHARACTERISTICS
Model Family
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
*At 50% load
VIN
V
24
48
24
48
24
48
24
48
Remote On/Off Control
Input Current
Under- Reflected
Recom- Internal
Reverse
Start-up voltage (back)
mended Input
Polarity On/Off
threshold ShutRipple Inrush Output Low Standby Fuse
Filter
Short
Negative Logic
2 TranProtection Current Positive Logic
down Current
Line Mode
Type
sient Circuit
V
V
mA pk-pk A2sec mA
A
mA
A
mA “P” model suffix “N” model suffix
9.5
8.5
6.25
12
17.3
16.0
3.71
6
OFF=Gnd pin or
OFF=open pin
9.5
8.5
6.21
12
30
–0.7
to
+1.2V
or
+10 to +15V
None
17.3
16.0*
3.70
6
0.05
50
1
L-C
- see
1
max. ON=open
max. ON=Gnd
9.5
8.5
6.31
10
notes
pin or +10 to
pin or –0.7 to
17.5
16.7
3.88
6
+15V max.
+1.2V max.
9.5
8.5
45
6.15
9
17.2
16.3
30
3.77
6
% of VNOM
±2
±1
ABSOLUTE MAXIMUM RATINGS
Volts, max. continuous
Q12 models
Volts, transient, 100 mSec
Input Voltage
Volts, max. continuous
Q48 models
Volts, transient, 100 mSec
On/Off control, referred to –Vin
Input Reverse Polarity Protection
Output Overvoltage
Output Current
Overtemperature Protection
Storage Temperature
Lead Temperature
Not Available
0-36 VDC to rated specifications
50 VDC, no damage
0-75 VDC to rated specifications
100 VDC, no damage
-0.7 V. min to +15V max.
See fuse section
VOUT nom. +20% max.
Current-limited. Devices can
withstand sustained short circuit
without damage. The outputs are
not intended to accept appreciable reverse current.
Device includes electronic overtemperature shutdown protection
under normal operation.
-55 to +125° C.
See soldering specifications
Efficiency
Overvoltage
protection
Hiccup auto-start
after fault removal
V
3.9
3.9
5.9
6.4
16.5
16
24
21.5
Line/Load
Regulation
A
15
18
10
12
4.2
5
3.3
4
50% Load
Capacitive Loading Max.
Adjustment Temperature Remote Sense
Range
Coefficient Compensation Low ESR <0.02Ω Max,
resistive load
% of VNOM % of VOUT /ºC % of VOUT max.
μF
+5
+5
+5
+5
±10
±0.02
2,000
Ripple/Noise
(20 MHz
bandwidth)8
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
VOUT
Accuracy
OV
protection
method
Model Family
IOUT
Max.
Minimum
loading
OUTPUT CHARACTERISTICS
No
mini- Magnetic
See ordering guide
mum feedback
load
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 Table is not implied nor
recommended.
Maximum Ratings Notes
The UEI-50/60W series does not include electronic Input Overvoltage
Protection. Therefore it is possible for the input to exceed the continuous ratings listed above and still operate. However, units are not
routinely Production-tested above the continuous ratings. Therefore,
the rated specifications do not apply at excessive input voltage and
performance is undetermined.
The transient specifications indicate that sample lots were successfully tested for 100 mS at the transient stress voltage and were
not damaged. As a practical matter in your application, it is often
difficult to determine how long an input overvoltage was applied.
Therefore, do not exceed the continuous voltage rating.
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email: [email protected]
27 May 2010
MDC_UEI Series 50-60W.B31 Page 4 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
ISOLATION CHARACTERISTICS
DYNAMIC CHARACTERISTICS
Input to
Output.
Isolation
Resistance
Min
Min
Model Family
Isolation
Capacitance Isolation Safety
Rating
Model Family
pF
Start-up Time
Dynamic Load
Response
VIN to VOUT Remote On/Off Switching
Frequency
(50-75-50% regulated
to VOUT
load step)
(Max.) regulated (Max.)
VDC
MΩ
UEI-3.3/15-Q12
2000
10
UEI-3.3/15-Q12
100 to 2% VOUT
275
UEI-3.3/18-Q48
2250
10
UEI-3.3/18-Q48
180 to 2% VOUT
280
UEI-5/10-Q12
2000
10
UEI-5/10-Q12
200 to 2% VOUT
UEI-5/12-Q48
2250
10
UEI-5/12-Q48
100 to 2% VOUT
UEI-12/4.2-Q12
2000
10
UEI-12/4.2-Q12
200 to 1% VOUT
UEI-12/5-Q48
2250
10
UEI-12/5-Q48
400 to 1% VOUT
250
UEI-15/3.3-Q12
2000
10
UEI-15/3.3-Q12
150 to 1% VOUT
265
UEI-15/4-Q48
2250
10
UEI-15/4-Q48
150 to 1% VOUT
255
1000
μsec
Basic
insulation
mSec
mSec
50
KHz
275
50
MISCELLANEOUS CHARACTERISTICS
Output Current
Limit Inception
Model Family
Output
Short
Circuit
98% of VOUT,
after warmup Protection
Method
A
UEI-3.3/15-Q12
20
UEI-3.3/18-Q48
23
UEI-5/10-Q12
13
UEI-5/12-Q48
15.5
UEI-12/4.2-Q12
6
UEI-12/5-Q48
6.1
UEI-15/3.3-Q12
5.3
UEI-15/4-Q48
5.8
Current
limiting,
hiccup
auto
restart
Output
Short
Circuit
Current
A
0.5
Output
Calculated
Short Circuit
Pre-biased
MTBF
Duration
setup
(output shorted
to ground)
Hours
Continuous
Monotonic
(external 2,000,000
VOUT < VSET)
Specification Notes:
(1) All models are tested and specified with external 1||10 μF output capacitors and a 22 μF external
input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate
our test equipment and may not be required to achieve specified performance in your applications. All
models are stable and regulate within spec under no-load conditions.
All specifications are typical unless noted. General conditions for Specifications are +25 deg.C,
Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied for extended testing under
power.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering
is Cin=33 μF, 100V, Cbus=220 μF, 100V, Lbus=12 μH.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage.
At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current
outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves
are presented at sea level altitude. Be aware of reduced power dissipation with increasing density
altitude.
(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.
(5) The On/Off Control is normally selected by a switch or an open collector or open drain transistor.
But it may also be driven with external logic or by applying appropriate external voltages which are
referenced to Input Common and do not exceed the On/Off voltage specifications.
(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.
(8) Output noise may be further reduced by adding an external filter. Low voltage logic circuits may
have a small voltage margin between logic ZERO and logic ONE, requiring noise suppression. Use only
Operating Temperature
Range
–40 to +85ºC;
with Derating
(see Notes)
Relative
Storage
Thermal
Humidity,
temperature protection/
nonrange
shutdown
condensing
ºC
ºC
ºC
–55 to 125ºC
115
To +85ºC/
85%
as much output filtering as needed to achieve your noise requirements. Excessive output capacitance
can retard transient response or possibly cause instability. Low ESR ceramic capacitors may degrade
dynamic performance. Be sure to thoroughly test your system under full load with all components
installed.
(9) All models are fully operational and meet published specifications, including “cold start” at –40°C.
(10) Regulation specifications describe the deviation as the line input voltage or output load current is
varied from a nominal midpoint value to either extreme.
(11) The output overvoltage protection is automatic recovery. The overvoltage may occur either from
internal failure or from an external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is
removed, the converter will immediately recover. After an output overcurrent or short circuit, “hiccup”
operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current
pulse prevents overheating and damaging the converter. Once the fault is removed, the converter
immediately resumes normal operation.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) At zero output current, the output may contain low frequency components which exceed the
ripple specification. The output may be operated indefinitely with no load.
(15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection with full
output load, always connect an external input fuse in series with the +Vin input. Use approximately
twice the full input current rating with nominal input voltage.
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.
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27 May 2010
MDC_UEI Series 50-60W.B31 Page 5 of 13
UEI Series
50-60W Isolated Wide-Range 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 StartUp 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,
TO
OSCILLOSCOPE
VIN
+
–
+
–
CURRENT
PROBE
1
+INPUT
LBUS
CBUS
CIN
2
−INPUT
CIN = 33μF, ESR < 700mΩ @ 100kHz
CBUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
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27 May 2010
MDC_UEI Series 50-60W.B31 Page 6 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
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.
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.
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. Our
Application Engineers can recommend potential solutions.
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.
In the figure, the two copper strips simulate real-world printed circuit
impedances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one half
inch and soldered directly to the fixture.
+SENSE
+OUTPUT
5
COPPER STRIP
6
C1
−OUTPUT
−SENSE
C2
RLOAD
SCOPE
7
8
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).
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF LOW ES
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.
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.
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
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MDC_UEI Series 50-60W.B31 Page 7 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
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.
Remote Sense Input
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting voltage drops along the output wiring such as moderate IR drops and the current carrying capacity of PC board etch. Sense inputs
also improve the stability of the converter and load system by optimizing the
control loop phase margin.
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.
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protection circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must insure:
(VOUT at pins) x (IOUT) ≤ (Max. rated output power)
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage over
the rated trim range (please refer to the Specifications). In the trim equations and
circuit diagrams that follow, trim adjustments use either a trimpot or a single
fixed resistor connected between the Trim input and either the +Sense or –Sense
terminals. (On some converters, an external user-supplied precision DC voltage
may also be used for trimming). Trimming resistors should have a low temperature coefficient (±100 ppm/deg.C or less) and be mounted close to the converter.
Keep leads short. If the trim function is not used, leave the trim unconnected.
With no trim, the converter will exhibit its specified output voltage accuracy.
There are two CAUTION’s 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
2
+SENSE
4
2
−INPUT
+OUTPUT
+SENSE
Contact and PCB resistance
losses due to IR drops
6
5
+OUTPUT
−INPUT
ON/OFF
CONTROL
1
+INPUT
5
9
TRIM
−SENSE
I OUT
6
−OUTPUT
7 5-22
TURNS
LOAD
8
7
Sense Current
4
ON/OFF
CONTROL
TRIM
9
LOAD
Figure 5 – Trim adjustments using a trimpot
Sense Return
−SENSE
1
8
I OUT Return
+INPUT
-OUTPUT
7
+OUTPUT
2
6
−INPUT
Contact and PCB resistance
losses due to IR drops
5
+SENSE
Figure 4 – Remote Sense Circuit Configuration
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.
4
ON/OFF
CONTROL
TRIM
+INPUT
LOAD
R TRIM DOWN
−SENSE
1
9
−OUTPUT
8
7
Please observe Sense inputs tolerance to avoid improper operation:
[VOUT(+) –VOUT(-)] – [ Sense(+) – Sense(-)] ≤ 10% of VOUT
Figure 6 – Trim adjustments to decrease Output Voltage using a Fixed Resistor
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MDC_UEI Series 50-60W.B31 Page 8 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
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.
+OUTPUT
−INPUT
+SENSE
4
ON/OFF
CONTROL
TRIM
5
9
LOAD
R TRIM UP
−SENSE
1
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.
6
2
Positive: Standard models are enabled when the On/Off pin is left open or
is pulled high to +15V with respect to –VIN. An internal bias current causes the
open pin to rise to +15V. Some models will also turn on at lower intermediate
voltages (see Specifications). Positive-polarity devices are disabled when the
On/Off is grounded or brought to within a low voltage (see Specifications) with
respect to –VIN.
+INPUT
−OUTPUT
8
+ Vcc
7
3
Figure 7 – Trim adjustments to increase Output Voltage using a Fixed Resistor
ON/OFF
CONTROL
Trim Equations
1
Trim Up
Trim Down
<Connect trim resistor
between Trim and –Sense>
<Connect trim resistor
between Trim and +Sense>
UEI-3.3/15-Q12, -3.3/18-Q48
RT UP (:) =
12775
VO – 3.3
– 2050
RTDOWN (:) =
Figure 8 – Driving the On/Off Control Pin (suggested circuit)
5110 (Vo - 2.5)
3.3 – VO
– 2050
There are two CAUTIONs for the On/Off Control:
UEI-5/10-Q12, -5/12-Q48
RT UP (:) =
12775
VO – 5
– 2050
5110 (Vo - 2.5)
– 2050
RTDOWN (:) =
5 – VO
UEI-12/4.2-Q12, -12/5-Q48
RT UP (:) =
25000
VO – 12
– 5110
RTDOWN (:) =
-INPUT
10000 (Vo-2.5)
–5110
12 – VO
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 or a relay (which can thereupon be controlled by
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.
UEI-15/3.3-Q12, UEI-15/4-Q48
RT UP (:) =
25000
VO – 15
– 5110
RTDOWN (:) =
10000 (Vo-2.5)
–5110
15 – VO
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.
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MDC_UEI Series 50-60W.B31 Page 9 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
Typical Performance Curves
UEI-3.3/15-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
UEI-3.3/15-Q12N Maximum Current Temperature Derating at Sea Level
(VIN = 24V, air flow is from pin 2 to pin 1)
90
15.5
15.0
85
VIN = 12V
80
Efficiency (%)
Output Current (Amps)
VIN = 10V
VIN = 24V
75
VIN = 36V
70
14.5
Natural Convection
14.0
100 LFM
13.5
200 LFM
13.0
65
12.5
60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
12.0
20
15
25
30
35
40
Load Current (Amps)
55
60
65
70
75
80
85
90
UEI-3.3/18-Q48N Maximum Current Temperature Derating at Sea Level
(VIN = 48V air flow direction is transverse)
18.0
90
17.5
88
86
Output Current (Amps)
VIN = 18V
VIN = 24V
84
Efficiency (%)
50
Ambient Temperature (°C)
UEI-3.3/18-Q48
Efficiency vs. Line Voltage and Load Current @ 25ºC
VIN = 36V
82
80
VIN = 48V
78
VIN = 60V
76
74
17.0
16.5
16.0
Natural Convection
15.5
100 LFM
15.0
200 LFM
14.5
VIN = 75V
300 LFM
72
14.0
70
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
400 LFM
13.5
18
20
25
30
35
Load Current (Amps)
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
UEI-5/10-Q12N Maximum Current Temperature Derating at Sea Level
(VIN = 24V, airflow is from pin 2 to pin 1)
UEI-5-10-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
100
10.5
90
Output Current (Amps)
10.0
80
Efficiency (%)
45
VIN = 10V
70
VIN = 24V
60
VIN = 36V
50
40
9.5
Natural Convection
9.0
8.5
8.0
7.5
30
7.0
1
2
3
4
5
6
7
8
9
10
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
Load Current (Amps)
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MDC_UEI Series 50-60W.B31 Page 10 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
Typical Performance Curves
UEI-5/12-Q48N Maximum Current Temperature Derating at Sea Level
(VIN = 48V, air flow is from pin 1 to pin 2)
UEI-5/12-Q48
Efficiency vs. Line Voltage and Load Current @ 25ºC
92
12
90
11.5
88
84
Output Current (Amps)
Efficiency (%)
86
VIN = 18V
VIN = 24V
82
VIN = 36V
80
VIN = 48V
78
VIN = 60V
11
10.5
Natural Convection
100 LFM
10
200 LFM
9.5
300 LFM
76
VIN = 75V
9
400 LFM
74
72
8.5
1
2
3
4
5
6
7
8
9
10
11
12
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
Load Current (Amps)
UEI-12/4.2-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
UEI-12/4.2-Q12 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, airflow is from pin 1 to pin 2)
92.5
4.25
90.0
4.20
87.5
85.0
Efficiency (%)
Output Current (Amps)
VIN = 9V
82.5
VIN = 24V
80.0
VIN = 36V
77.5
75.0
72.5
70.0
67.5
65.0
4.15
Natural Convection
4.10
100 LFM
4.05
200 LFM
4.00
300 LFM
3.95
3.90
62.5
3.85
60.0
0.31
0.69
1.13
1.48
1.87
2.25
2.64
3.01
3.42
3.81
4.20
3.80
40
45
50
55
Load Current (Amps)
60
65
70
75
80
85
90
Ambient Temperature (°C)
UEI-12/5-Q48
Efficiency vs. Line Voltage and Load Current @ 25ºC
UEI-12/5-Q48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, air flow is from pin 2 to pin 1)
92
5.2
90
88
4.95
86
Efficiency (%)
84
Output Current (Amps)
VIN = 18V
VIN = 24V
82
VIN = 36V
80
VIN = 48V
78
VIN = 75V
76
74
4.7
4.45
Natural Convection
4.2
100 LFM
3.95
200 LFM
3.7
300 LFM
3.45
400 LFM
72
70
68
66
0.5
3.2
1
1.75
2.5
3
3.5
4
4.5
5
2.95
20
Load Current (Amps)
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (°C)
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MDC_UEI Series 50-60W.B31 Page 11 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
Typical Performance Curves
UEI-15/3.3-Q12 Maximum Current Temperature Derating at Sea Level
(VIN = 12V, open frame, air flow is from pin 1 to pin 2)
UEI-15/3.3-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
92.0
3.3
3.2
Output Current (Amps)
Efficiency (%)
89.5
87.0
VIN = 9V
84.5
VIN = 12V
VIN = 24V
82.0
VIN = 36V
3.1
Natural Convection
3.0
100 LFM
2.9
200 LFM
300 LFM
2.8
2.7
79.5
2.6
2.5
77.0
0.82
1.06
1.32
1.57
1.82
2.07
2.32
2.57
2.82
3.07
70
3.32
75
UEI-15/3.3-Q12 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, open frame, air flow is from pin 1 to pin 2)
UEI-15/4-Q48N-C
Efficiency vs. Line Voltage and Load Current @ 25ºC
3.3
Natural Convection
100 LFM
2.9
200 LFM
Efficiency (%)
Output Current (Amps)
3.2
3.0
300 LFM
2.8
2.7
2.6
2.5
70
75
80
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
1.5
85
1.7
2.0
2.2
2.7
3.0
3.2
3.5
3.7
4.0
UEI-15/4-Q48 Maximum Current Temperature Derating at Sea Level
(VIN = 48V, transverse airflow)
4.0
4.0
3.5
3.5
Output Current (Amps)
Output Current (Amps)
UEI-15/4-Q48 Maximum Current Temperature Derating at Sea Level
(VIN = 24V, transverse airflow)
Natural Convection
100 LFM
200 LFM
300 LFM
2.5
2.5
Load Current (Amps)
Ambient Temperature (°C)
3.0
85
Ambient Temperature (°C)
Load Current (Amps)
3.1
80
Natural Convection
3.0
100 LFM
200 LFM
300 LFM
2.5
400 LFM
400 LFM
2.0
25
2.0
30
35
40
45
50
55
60
65
70
75
80
85
25
Ambient Temperature (°C)
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
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MDC_UEI Series 50-60W.B31 Page 12 of 13
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
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.
www.murata-ps.com/locations
27 May 2010
email: [email protected]
MDC_UEI Series 50-60W.B31 Page 13 of 13