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UWR 26-40W Series
Single Output, High-Density, 3.3V
OUT
and 5 V
OUT
, 26-40 Watt, DC/DC Converters
FEATURES
Standard 2" x 2" packages/pinouts
Output voltages/currents:
•
•
PRODUCT OVERVIEW
The newest products in Murata Power Solutions' flagship A-Series are the UWR, 26-40
Watt isolated singles. Housed in standard 2" x 2" metal packages (which have tradition-
ally carried 15-20 Watt devices), these power converters supply up to 9 Amps @ 3.3V or
8 Amps at 5V. They exemplify Murata Power Solutions' relentless drive to bring designers
more power/current, in standard packages/pinouts, without compromising reliability or
resorting to thermal specmanship. Input voltage ranges are 10-18V (“D12” models), 18-
36V (“D24” models) or 36-75V (“D48”) models.
Employing an advanced, fully synchronous, high-frequency (300-360kHz) forward to-
pology, UWR 26-40W singles attain 88-90% efficiencies enabling full-power operation to
ambient temperatures as high as +55°C without supplemental air flow. Assembled using
fully automated, SMT-on-pcb techniques, these DC/DC’s additionally provide low noise
(75mVp-p), high accuracy (±1%), tight line/load regulation (±0.5%), quick step response
(200µsec), and stable no-load operation.
All models feature input pi filters, input undervoltage and overvoltage shutdown,
output overvoltage protection, current limiting, short-circuit protection, and thermal shut-
down. Each model has a VOUT trim pin as well as an on/off control function that may be
ordered with either positive or negative logic. These devices are fully isolated (1500Vdc)
and satisfy UL/EN/IEC60950-1 safety requirements. “D48” models (36-75V inputs) are CE
marked.
3.3 Volts @ 8/9 Amps
5 Volts @ 7/8 Amps
Choice of 3 input voltage ranges:
10-18V, 18-36V, 36-75V
synchronous forward topology
Fully
Outstanding performance:
•
•
•
•
±1% setpoint accuracy
Efficiencies to 90%
Noise as low as 75mVp-p
Stable no-load operation
On/off control and V
OUT
trim pins
isolated (1500Vdc); I/O protected
Fully
Thermal shutdown
Designed to meet UL/EN/IEC60950-1
certification; CE marked
FIGURE 1. SIMPLIFIED SCHEMATIC
+INPUT
(1)
+OUTPUT
(6)
SWITCH
CONTROL
–OUTPUT
(7)
–INPUT
(2)
THERMAL
SHUTDOWN
PWM
CONTROLLER
UVLO & OVLO
COMPARATORS
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT
TRIM
(8)
ON/OFF
CONTROL
(4)
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
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MDC_UWR26-40W.D01
Page 1 of 10
UWR 26-40W Series
Single Output, High-Density, 3.3V
OUT
and 5 V
OUT
, 26-40 Watt, DC/DC Converters
Performance Specifications and Ordering Guide
➀
Output
Input
Model
➄
UWR-3.3/8-D12A-C
UWR-3.3/9-D24A-C
UWR-3.3/9-D48AN-C
UWR-5/7-D12A-C
UWR-5/8-D24A-C
UWR-5/8-D48AN-C
V
OUT
(Volts)
3.3
3.3
3.3
5
5
5
I
OUT
(Amps)
8
9
9
7
8
8
R/N (mVp-p)
➁
Typ.
75
75
75
75
75
75
Regulation (Max.)
Line
±0.05%
±0.5%
±0.5%
±0.5%
±0.05%
±0.5%
Max.
110
110
110
110
110
110
Load
➂
±0.5%
±0.5%
±0.5%
±0.5%
±0.15%
±0.5%
V
IN
Nom.
(Volts)
12
24
48
12
24
48
Range
(Volts)
10-18
18-36
36-75
10-18
18-36
36-75
I
IN
➃
(mA/A)
145/2.97
50/1.4
25/0.7
160/3.26
90/1.82
25/0.93
Efficiency
Min.
88%
86%
86%
85.5%
90%
86%
Typ.
89%
88.5%
88.5%
89.5%
91.5%
90%
Package
(Case,
Pinout)
C4, P6
C4, P6
C4, P6
C4, P6
C4, P6
C4, P6
As of September 2014, ONLY the following part numbers will be available: UWR-3.3/8-D12A-C; UWR-5/8-D24A-C
➀
Typical at TA = +25°C under nominal line voltage and full-load conditions, unless noted.
➁
Ripple/Noise (R/N) is tested/speciifed over a 20MHz bandwidth. All models are specified with an external 0.47µF
multi-layer ceramic capacitor installed across their output pins. Using a 10µF multi-layer ceramic capacitor instead
(e.g. TDK part no. C3225X5R1C106M) will further reduce the R/N to 35mVp-p typical and 75mVp-p maximum.
➂
Load regulation is specified over 0-100% load conditions. All models are stable and regulate within spec under
no-load conditions, with perhaps a slight increase in output ripple/noise.
➃
Nominal line voltage, no-load/full-load conditions.
➄
Please refer to the part number structure when ordering.
P A R T
N U M B E R
S T R U C T U R E
M E C H A N I C A L
S P E C I F I C A T I O N S
U WR
-
3.3
/
9
-
D48 A N
-
C
Output Configuration:
U
= Unipolar
Wide Range Input
Nominal Output Voltage:
3.3 or 5 Volts
Maximum Output Current
in Amps
RoHS-6 hazardous
substance compliant
On/Off Logic, see below
0.20 MIN
(5.1)
2.00
(50.8)
METAL CASE
0.45
(11.4)
Case C4
INSULATED BASE
0.040 ± 0.002 DIA.
(1.02 ± 0.05)
A-Series
High Reliability
Input Voltage Range:
D12
= 10-18 Volts (12V nominal)
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
1.800
(45.72)
0.10
(2.5)
0.200
(5.08)
5
6
1
2
7
4
8
0.100
(2.54)
BOTTOM VIEW
Part Number Suffixes
UWR 26-40W DC/DC's are designed so the On/Off Control function on pin 4 can be ordered with
either positive (open or "high" = on) or negative (open = off, pull low = on) logic. The standard part
number with no suffix denotes positive logic. Add an "N" suffix to select negative logic.
No Suffix
On/Off Control function (positive logic) on pin 4. Standard for D12, D24.
"N" Suffix
On/Off Control function (negative logic) on pin 4. Standard for D48.
0.400
(10.16)
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
2.00
(50.8)
0.40
(10.2)
I/O Connections
Pin
Function P6
1
+Vin
2
–Vin
3
No Pin
4
On/Off Control
5
No Pin
6
+Vout
7
–Vout
8
Trim
Dimensions are in inches (mm shown for ref. only).
Note
For D12A and D24A models,
the case is connected to
Pin 2 (–Input).
For D48A models, the case is
connected to Pin 1 (+Input).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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MDC_UWR26-40W.D01
Page 2 of 10
UWR 26-40W Series
Single Output, High-Density, 3.3V
OUT
and 5 V
OUT
, 26-40 Watt, DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀➁
Input
Dynamic Characteristics
Input Voltage Range:
D12 Models
D24 Models
D48 Models
Overvoltage Shutdown:
D12 Models
D24 Models
D48 Models
Start-Up Threshold:
➂
D12 Models
D24 Models
D48 Models
Undervoltage Shutdown:
➂
D12 Models
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode (Off, OV, UV)
Input Reflected Ripple Current
Input Filter Type
D12 Models
D24 Models
D48 Models
Reverse-Polarity Protection
On/Off Control:
➃ ➄
"N" Models
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
19-23 Volts (21V typical)
37-43 Volts (40V typical)
76.5-82 Volts (78V typical)
8.5-10 Volts (9V typical)
16-18 Volts (17V typical)
33.5-36 Volts (35V typical)
7.5-9 Volts (8V typical)
15-17 Volts (16V typical)
31-33.5 Volts (32V typical)
See Ordering Guide
5mA
250mAp-p
Dynamic Load Response:
(50-100% load step to 1% V
OUT
)
Start-Up Time:
V
IN to
V
OUT
On/Off
to
V
OUT
Switching Frequency:
UWR-3.3/8-D12A
UWR-3.3/9-D24A, -D48A
UWR-5/7-D12A
UWR-5/8-D24A, -D48A
MTBF
➅
UWR-5/8-D24A
Operating Temperature
➁
Thermal Shutdown
Storage Temperature
Flammability
200µsec maximum
10ms
10ms
360kHz (±36kHz)
300kHz (±30kHz)
360kHz (±36kHz)
310kHz (±30kHz)
Environmental
Bellcore, ground fixed, full power
25°C ambient
1.6 million hours
-40 to +85°C, with derating
+110°C case
–40 to +120°C
UL94V-0
Physical
Capacitive (13.2µF)
Pi (0.01µF-1µH-6.6µF)
Pi (0.01µF-2.2µH-2µF)
Brief duration, 5A maximum
On = open or 13V - +V
IN
, I
IN
= 1.6mA max.
Off = 0-0.8V, I
IN
= 2.6mA max.
On = 0-0.8V, I
IN
= 1mA max.
Off = open or 3.3-+V
IN
, I
IN
= 1mA max.
Output
Dimensions
Case Material
See mechanical specifications
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
RoHS: Gold plate over copper alloy
Non-RoHS: Pure tin over copper alloy
2.7 ounces (76.5 grams)
Pin Material
Weight:
Primary to Secondary Insulation Level
Functional (D12, D24 models)
Basic (D48 models)
V
OUT
Accuracy
(50% load):
Minimum Loading for Stability:
➆
Ripple/Noise
(20MHz BW)
➀ ➅
Line/Load Regulation
Efficiency
Trim Range
➁
Isolation Voltage:
Input-to-Output
Output to Case
Isolation Capacitance
Isolation Resistance
Current Limit Inception
(@98%V
OUT
):
3.3V
OUT
Models
5V
OUT
Models
Short Circuit Current:
(Average)
3.3V
OUT
Models
5V
OUT
Models
Overvoltage Protection:
3.3V
OUT
Models
5V
OUT
Models
Temperature Coefficient
±1.0%, maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide
±5%
1500Vdc minimum
1500Vdc minimum
470pF
100MΩ
10.5-11.5 Amps
8.5-9.5 Amps
3 Amps maximum
4 Amps maximum
Output voltage comparator
3.7-4.1 Volts
5.6-7.1 Volts
±0.02% per °C.
➀
All models are specified with external 0.47µF ceramic output capacitor.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter
can cause permanent damage.
➃
Output noise may be further reduced with the addition of additional external output
capacitors. See Technical Notes. Use only as much output filtering as needed
and no more.
Larger caps (especially low-ESR ceramic types) may slow transient response or degrade
dynamic performance.
➄
The On/Off Control is designed to be driven with open-collector logic or the application
of appropriate voltage levels. Voltages may be referenced to the –Input (pin 2).
➅
Demonstrated MTBF available on request.
Minimum Loading for Specification:
➁
10% of I
OUT
maximum
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MDC_UWR26-40W.D01
Page 3 of 10
UWR 26-40W Series
Single Output, High-Density, 3.3V
OUT
and 5 V
OUT
, 26-40 Watt, DC/DC Converters
Absolute Maximum Ratings
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For Murata Power Solutions A-Series UWR 26-40 Watt DC/
DC Converters, you should use slow-blow type fuses with values no greater
than the following.
Model
UWR-3.3/8-D12
UWR-3.3/9-D24
UWR-3.3/9-D48
UWR-5/7-D12
UWR-5/8-D24
UWR-5/8-D48
Fuse Value
7 Amps
4 Amps
2 Amps
8 Amps
5 Amps
3 Amps
Input Voltage:
Continuous:
D12A Models
D24A Models
D48A Models
Transient (100msec):
D12A Models
D24A Models
D48A Models
On/Off Control (pin 4) Max. Voltages
Referenced to –Input (pin 2)
No Suffix
"N" Suffix
Input Reverse-Polarity Protection
Output Current
18 Volts
36 Volts
75 Volts
25 Volts
50 Volts
100 Volts
+V
IN
+V
IN
Current must be <5 Amps. Brief
duration only. Fusing recommended.
Current limited. Devices can
withstand sustained output short
circuits without damage.
+100°C
–40 to +120°C
See soldering guidelines
Case Temperature
Storage Temperature
Lead Temperature
Start-Up and Undervoltage Shutdown
Under normal start-up conditions, UWR 26-40W converters will not begin
to regulate properly until the ramping input voltage exceeds the Start-Up
Threshold. Once operating, devices will turn off when the applied voltage
droops below the Undervoltage Shutdown point. Devices will remain off as
long as the undervoltage condition continues. Units will automatically restart
when the applied voltage is brought back above the Start-Up Threshold.. The
hysteris is built into the function avoids an indeterminate on/off condition at
a single input voltage . See Performance/Functional Specifications table for
actual limits.
On/Off Control
The input-side, remote On/Off Control function (pin 4) can be ordered to
operate with either logic. Positive-logic devices (standard, no part-number
suffix) are enabled when pin 4 is left open or is pulled high (+13V to V
IN
applied with respect to –Input, pin 2, (see Figure 2). Positive-logic devices
are disabled when pin 4 is pulled low (0-0.8V with respect to –Input).
Negative-logic devices are off when pin 4 open or pulled high (3.3V to +V
IN
),
and on when pin 4 is pulled low (0-0.8V). See Figure 3.
These 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.
T E C H N I C A L
N O T E S
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating,"
with respect to the input. Designers will normally use the –Output (pin 7)
as the ground/return of the load circuit. You can, however, use the +Output
(pin 6) as ground/return to effectively reverse the output polarity.
Minimum Output Loading Requirements
UWR 26-40 Watt converters employ a synchronous-rectifier design topology.
All models regulate within spec and are stable under no-load conditions.
1
+VIN
Filtering and Noise Reduction
All UWR 26-40 Watt DC/DC Converters achieve their rated ripple and noise
specifications using the external output capacitor specified in the Perfor-
mance/Functional Specifications table. In critical applications, input/output
noise may be further reduced by installing additional external I/O caps.
Input capacitors should be selected for bulk capacitance, low ESR and high
rms-ripple-current ratings. Input capacitors serve as energy-storage devices
to minimize variations in line voltage caused by transient IR drops in PCB
conductors from backplane to the DC/DC. Output capacitors should be
selected for low ESR and appropriate frequency response. All caps should
have appropriate voltage ratings and be mounted as close to the converters
as possible. The most effective combination of external I/O capacitors will be
a function of your particular load and layout conditions.
13V CIRCUIT
4
ON/OFF
CONTROL
5V CIRCUIT
2
–VIN
Figure 2. Driving the Positive Logic On/Off Control Pin
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MDC_UWR26-40W.D01
Page 4 of 10
UWR 26-40W Series
Single Output, High-Density, 3.3V
OUT
and 5 V
OUT
, 26-40 Watt, DC/DC Converters
Current Limiting
When output power increases above the rated output current, (see Cur-
rent Limit in Performance/Functional Specifications) the DC/DC converter
will go into a current limiting mode. In this condition the output voltage
will decrease proportionately with increases in output current, thereby
maintaining a somewhat constant power dissipation. This is commonly
referred to as power limiting. Current limit inception is defined as the point
where the full-power output voltage falls below the specified tolerance.
See Performance/Functional Specifications. If the load current being drawn
from the converter is significant enough, the unit will go into a short circuit
condition. See "Short Circuit Condition."
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop
as the output current demand increases. If the output voltage drops too
low, the magnetically coupled voltage used to develop primary side volt-
ages will also drop, thereby shutting down the PWM controller.
Following a time-out period the PWM will restart causing the output volt-
ages to begin ramping to their appropriate values. If the short-circuit condi-
tion persists, another shutdown cycle will be initiated. This on/off cycling
is referred to as "hiccup" mode. The hiccup cycling reduces the average
output current, thereby preventing internal temperatures from rising to
excessive levels. The UWR 26-40 Watt A-Series is capable of enduring an
indefinite short circuit output condition.
Thermal Shutdown
These A-Series converters are equipped with Thermal Shutdown
Circuitry. If environmental conditions cause the internal temperature of
the DC/DC converter to rise above the designed operating temperature, a
precision temperature sensor will power down the unit. When the internal
temperature decreases below the threshold of the temperature sensor the
unit will self start. See Performance/Functional Specifications.
Output Overvoltage Protection
The output voltage is monitored for an overvoltage condition via
magnetic coupling to the primary side. If the output voltage rises to a fault
condition, which could be damaging to the load circuitry (see Performance
Specifications), the sensing circuitry will power down the PWM controller
causing the output voltage to decrease. Following a time-out period the
PWM will restart, causing the output voltage to ramp to its appropriate
value. If the fault condition persists, and the output voltages again climb
to excessive levels, the overvoltage circuitry will initiate another shutdown
cycle. This on/off cycling is referred to as "hiccup" mode.
1
+VIN
4
ON/OFF
CONTROL
2
–VIN
Figure 3. Driving the Negative Logic On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should be able to sink appropriate
current (see Performance Specs) when activated and withstand appropriate
voltage when deactivated.
Applying an external voltage to pin 4 when no input power is applied to
the converter can cause permanent damage to the converter.
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval of time where the input volt-
age crosses the turn-on threshold point, and the fully loaded output voltage
enters and remains within its specified accuracy band. Actual measured
times will vary with input source impedance, external input/output capaci-
tance, and load. The UWR 26-40 Watt implements a soft start circuit that
limits the duty cycle of the PWM controller at power up, thereby limiting the
Input Inrush current.
The On/Off Control to V
OUT
start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin.
The specification defines the interval between the time at which the con-
verter is turned on and the fully loaded output voltage enters and remains
within its specified accuracy band. Similar to the V
IN
to V
OUT
start-up, the
On/Off Control to V
OUT
start-up time is also governed by the internal soft
start circuitry and external load capacitance.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage
(35V for "D48" models). Once operating, devices will not turn off until the
input voltage drops below the Undervoltage Shutdown limit (34V for "D48"
models). Subsequent re-start will not occur until the input is brought back
up to the Start-Up Threshold. This built in hysteresis prevents any unstable
on/off situations from occurring at a single input voltage.
Input voltages exceeding the input overvoltage shutdown specification
listed in the Performance/Functional Specifications will cause the device
to shutdown. A built-in hysteresis of 0.6 to 1.6 Volts for all models will not
allow the converter to restart until the input voltage is sufficiently reduced.
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MDC_UWR26-40W.D01
Page 5 of 10
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