UEI-15 Ver la hoja de datos (PDF) - Murata Manufacturing
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UEI-15 Datasheet PDF : 13 Pages
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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
Trim Equations
Trim Up
<Connect trim
resistor between
Trim and −VOUT>
Trim Down
<Connect trim
resistor between
Trim and +VOUT>
UEI15-033-Q12, Q48
12775
RTUP (Ω) = VO – 3.3 – 2050
5110 (Vo - 2.5)
RTDOWN (Ω) = 3.3 – VO – 2050
UEI15-050-Q12, Q48
RTUP (Ω) =
12775
– 2050
VO – 5
5110 (Vo - 2.5)
RTDOWN (Ω) =
5 – VO
– 2050
UEI15-120-Q12, Q48
25000
RTUP (Ω) =
– 5110
VO – 12
RTDOWN
(Ω)
=
10000
12
(Vo-2.5)
– VO
–
5110
UEI15-150-Q12, Q48
25000
RTUP (Ω) = VO – 15 – 5110
10000 (Vo-2.5)
RTDOWN (Ω) =
– 5110
15 – VO
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.
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.
ON/OFF CONTROL
+ Vcc
CONTROL
-INPUT
Figure 7 – Driving the On/Off Control Pin (suggested circuit)
There are three CAUTIONs for the On/Off Control:
CAUTION: To retain full output circuit isolation, control the On/Off from the in-
put 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 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
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
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UEI15W.B21 Page 9 of 13
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