Datasheet

VNOM is the nominal, untrimmed output voltage.
V
OUT is the desired new output voltage.
Do not exceed the specified trim range or maximum power ratings
when adjusting trim. Use 1% precision resistors mounted close
to the converter on short leads.
Trim Down
Connect trim resistor between
trim pin and −Sense

1
R
TrimDn
(kΩ) =
− 2
Where,
VNOMINAL − VOUT
VNOMINAL
Trim Up
Connect trim resistor between
trim pin and +Sense
1.225 × 
V
NOMINAL × (1 + )
R
TrimUp
(kΩ) =
− 2−
1

Where,
VOUT − VNOMINAL
VNOMINAL
Figure 5. Trim Connections Using A Trimpot
Figure 7. Trim Connections to Decrease Output VoltagesFigure 6. Trim Connections to Increase Output Voltages
LOAD
+OUT
+IN
–IN
ON/OFF
TRIM
+SENSE
–OUT
–SENSE
LOAD
R
TRIM DOWN
+OUT
+IN
–IN
ON/OFF
TRIM
+SENSE
–OUT
–SENSE
LOAD
R
TRIM UP
+OUT
+IN
–IN
ON/OFF
TRIM
+SENSE
–OUT
–SENSE
Trim Equations
Trim Circuits
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Single Output UCH Models
Isolated, “Half-Brick”
1.8−15V Output DC/DC Converters
MDC_UCH Models.C01 Page 17 of 18