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UEI30-050-Q12NL1-C Datasheet(PDF) 8 Page - Murata Manufacturing Co., Ltd.

Part # UEI30-050-Q12NL1-C
Description  30W Isolated Wide-Range DC/DC Converters
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Manufacturer  MURATA [Murata Manufacturing Co., Ltd.]
Direct Link  http://www.murata.com
Logo MURATA - Murata Manufacturing Co., Ltd.

UEI30-050-Q12NL1-C Datasheet(HTML) 8 Page - Murata Manufacturing Co., Ltd.

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UEI30 Series
30W Isolated Wide-Range DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
03 Feb 2011
MDC_UEI Series 30W.A14 Page 8 of 16
may also be used for trimming). Trimming resistors should have a low tempera-
ture 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 CAUTIONs to observe 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 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 overtempera-
ture 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.
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.
Remote On/Off Control
On the input side, a remote On/Off Control can be specified with either positive
or negative logic as follows:
Positive: Models equipped with Positive Logic 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.
Figure 4 – Trim adjustments using a trimpot
LOAD
7 5-22
TURNS
+OUTPUT
TRIM
−OUTPUT
−INPUT
ON/OFF
CONTROL
+INPUT
Figure 5 – Trim adjustments to decrease Output Voltage using a Fixed Resistor
LOAD
RTRIM DOWN
+OUTPUT
TRIM
ON/OFF
CONTROL
+INPUT
−OUTPUT
−INPUT
UP
VO – 5
RT (:) =
2050
12775
5 – VO
RT
(:) =
2050
5110 (Vo - 2.5)
DOWN
UP
VO – 12
RT (:) =
5110
25000
12 – VO
RT
(:) =
5110
10000 (Vo-2.5)
DOWN
UP
DOWN
UEI30-050-Q12/-Q48
UEI30-120-Q12/-Q48
UP
VO – 3.3
RT (:) =
2050
12775
3.3 – VO
RT
(:) =
2050
5110 (Vo - 2.5)
DOWN
UEI30-033-Q12/-Q48
VO – 15
RT (:) =
5110
25000
15 – VO
RT
(:) =
5110
10000 (Vo-2.5)
UEI30-150-Q12/-Q48
Figure 6 – Trim adjustments to increase Output Voltage using a Fixed Resistor
+OUTPUT
TRIM
ON/OFF
CONTROL
+INPUT
LOAD
R TRIM UP
−OUTPUT
−INPUT


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