Datasheet

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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. Specifi cations are subject to change without
notice. © 2014 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
MDC_UEI Series 50-60W.C10 Page 14 of 14
Figure 7. Trim adjustments to increase Output Voltage using a Fixed Resistor;
if sense is omitted, connect trim pin to -output.
+VOUT
+SENSE
TRIM
− SENSE
− VOUT
+ VIN
ON/OFF
CONTROL
− VIN
LOAD
R TRIM UP
UP
VO – 5
R
T () =
– 2050
12775
5 – V
O
RT () =
– 2050
5110 (Vo - 2.5)
DOWN
UP
VO – 12
R
T () =
– 5110
25000
12 – V
O
RT () =
–5110
10000 (Vo-2.5)
DOWN
UP
DOWN
UEI-5/10-Q12, -5/12-Q48
UEI-12/4.2-Q12, -12/5-Q48
UP
VO – 3.3
R
T () =
– 2050
12775
3.3 – V
O
RT () =
– 2050
5110 (Vo - 2.5)
DOWN
UEI-3.3/15-Q12, -3.3/18-Q48
VO – 15
R
T () =
– 5110
25000
15 – V
O
RT () =
–5110
10000 (Vo-2.5)
UEI-15/3.3-Q12, UEI-15/4-Q48
Trim Equations
Trim Up Trim Down
<Connect trim resistor
between Trim and –Sense>
<Connect trim resistor
between Trim and +Sense>
Where Vo = Desired output voltage. Adjustment accuracy is subject to resis-
tor tolerances and factory-adjusted output accuracy. Mount trim resistor close
to converter. Use short leads.
Negative: Optional negative-logic devices are on (enabled) when the On/Off
is grounded or brought to within a low voltage (see Specifi cations) with respect
to –V
IN. The device is off (disabled) when the On/Off is left open or is pulled
high to +15V
DC 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 fi nite time in milliseconds (see
Specifi cations) 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.
There are two CAUTIONs for the On/Off Control:
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.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either logic type.
Positive: Standard models are enabled when the On/Off pin is left open or
is pulled high to +15V with respect to –V
IN. An internal bias current causes the
open pin to rise to +15V. Some models will also turn on at lower intermediate
voltages (see Specifi cations). Positive-logic devices are disabled when the On/
Off is grounded or brought to within a low voltage (see Specifi cations) with
respect to –V
IN.
Figure 8. Driving the On/Off Control Pin (suggested circuit)
ON/OFF
CONTROL
-VIN
+ Vcc
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations 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