GE Industrial Solutions Zephyr Non-Isolated SMT - Manual (Page 18)

Zephyr Non-Isolated SMT DC-DC Power Module:
0.8V to 3.5V @ 20A Output, 5V to 12V Input
LINEAGE POWER 18
Data Sheet
March 31, 2010
Trim
T
RIM pin is provided to margin high/low the output voltage by certain percentages independent of the output
voltage. The equation to margin low by connecting a resistor, R
LOW
, from T
RIM
pin to O
UTSENSE
+ pin is:
OUT NOM
NOM OUT
LOW
V V
V V
R
⋅ − ⋅
⋅ − ⋅
=
2 2
621 654
[k
Ω
] (6)
To margin low by 2.5%, R
LOW
= 332.0 k
Ω. Shorting T
RIM
pin to O
UTSENSE
+ pin provides the maximum
negative adjustment of 5.0%.
The equation to margin high by connecting a resistor, R
HIGH , from T RIM pin to O UTSENSE – pin is:
NOM OUT
OUT NOM
HIGH
V V
V V
R
⋅ − ⋅
⋅ − ⋅
=
2 2
588 621
[k
Ω
] (7)
To margin high by 2.5%, R
HIGH = 365.0 k
Ω. Shorting T
RIM pin to O UTSENSE – pin provides the maximum
positive adjustment of 5.0%.
If T RIM is not connected to O UTSENSE + or O UTSENSE
−
, V OUT = V NOM .