UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL A-Series
UWR 14-20 Watt DC/DC Converters, you should use slow-blow type fuses
with values no greater than the following:
V
IN
Range
D5A
D12A
D48A/D48E
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250μA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70μA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(–Input). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
Output Trimming
V
OUT
may be trimmed ±5% via a single external trimpot or fixed resistor.
The trimpot should be connected as shown in Figure 2a with its wiper
connected to pin 8 (Trim). A trimpot can be used to determine the value
of a single fixed resistor which should be connected as shown in Figure
2b. Connect the resistor between pin 8 (Trim) and pin 6 (+Output) to trim
"down" the output voltage. Connect the resistor between pins 8 and 7
(Common) to trim "up" the output voltage. Fixed resistors should be metal-
film types with absolute TCR’s less than 100ppm/°C to ensure stability.
Fuse Value
6A
4A
2A
+OUTPUT
1
+INPUT
TRIM
2
–INPUT
COMMON
7
8
20k
5-10
TURNS
LOAD
6
Figure 2a. Trim Connections Using a Trimpot
+OUTPUT
1
+INPUT
TRIM
2
–INPUT
COMMON
6
Trim
Down
8
LOAD
Trim Up
7
Custom Capabilities
DATEL’s world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for
your demanding, large volume, OEM applications. More importantly . . .
we’ll do it on time and within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effec-
tive power converters available.
Figure 2b. Trim Connections Using Fixed Resistors
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 atmo-
spheric 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
Maximum Pot Temperature
Maximum Solder Dwell Time
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105° C.
250° C.
6 seconds
115° C.
270° C.
7 seconds
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_UWR14-20 Series.B02
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MURATA [ MURATA MANUFACTURING CO., LTD. ]
