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UWE-100-120W Series
Wide Input, Isolated Eighth-Brick DC-DC Converters
Trim Equations
+VIN
+VOUT
+SENSE
Trim Up
3.3 Volt Output
Trim Down
ON/OFF
CONTROL
TRIM
–SENSE
1MΩ
5-20
TURNS
LOAD
R T UP (k ? ) =
13.3(V O – 1.226)
V O – 3.3
– 10.2
R T DOWN (k ? ) =
16.31
3.3 – V O
– 10.2
5 Volt Output
–VIN
–VOUT
Figure 6. Trim Connections Using a Trimpot
R T UP (k ? ) =
20.4(V O – 1.226)
V O – 5
– 10.2
R T DOWN (k ? ) =
25.01
5 – V O
– 10.2
12 Volt Output
+VIN
+VOUT
R T UP (k ? ) =
49.6(V O – 1.226)
V O – 12
– 10.2
R T DOWN (k ? ) =
60.45
12 – V O
– 10.2
+SENSE
ON/OFF
CONTROL
–VIN
TRIM
–SENSE
–VOUT
R1
LOAD
A single resistor connected from the Trim to the +Output, or +Sense where
applicable, will increase the output voltage in this con?guration. A resistor con-
nected from the Trim to the –Output, or –Sense where applicable, will decrease
the output voltage in this con?guration.
Trim adjustments greater than the speci?ed range can have an adverse
Figure 7. Trim Connections to Increase Output Voltages Using a Fixed Resistor
affect on the converter's performance and are not recommended. Excessive
voltage differences between V OUT and Sense, in conjunction with trim adjust-
ment of the output voltage, can cause the overvoltage protection circuitry to
activate (see Performance Speci?cations for overvoltage limits). Power derating
+VIN
+VOUT
+SENSE
is based on maximum output current and voltage at the converter’s output
pins. Use of trim and sense functions can cause output voltages to increase,
thereby increasing output power beyond the converter's speci?ed rating or
ON/OFF
CONTROL
TRIM
R2
LOAD
cause output voltages to climb into the output overvoltage region. Therefore:
(V OUT at pins) x (I OUT ) <= rated output power
–SENSE
Note: Resistor values are in k ? . Adjustment accuracy is subject to resistor
–VIN
–VOUT
tolerances and factory-adjusted output accuracy. V O = desired output voltage.
Figure 8. Trim Connections to Decrease Output Voltages
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MDC_UWE-100-120W.B07 Page 24 of 27
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