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Page 6 of 15

External Trim Adjustment

Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a

module. This is accomplished by connecting an external resistor between the TRIM pin and either the +Vout or

-Vout pins. With an external resistor between the TRIM and +Vout pin, the output voltage set point decreases.

With an external resistor between the TRIM and -Vout pin, the output voltage set point increases.

Trim

Vo

–

1%

3.333V 385.071 kΩ

3.267V

116.719 kΩ

2%

3.366V 191.511 kΩ

3.234V

54.779 kΩ

3%

3.399V

126.99 kΩ

3.201V

34.133 kΩ

4%

3.432V

94.73 kΩ

3.168V

23.810 kΩ

5%

3.465V

75.374 kΩ

3.135V

17.616 kΩ

6%

3.498V

62.47 kΩ

3.102V

13.486 kΩ

7%

3.531V

53.253 kΩ

3.069V

10.537 kΩ

8%

3.564V

46.34 kΩ

3.036V

8.325 kΩ

9%

3.597V

40.963 kΩ

3.003V

6.604 kΩ

10%

3.63V

36.662 kΩ

2.97V

5.228 kΩ

(in Ω)

Table 3 Trim Resistor Values

(in Ω)

RT2

RT1

-Vout

Trim

+Vout

+Vin

-Vin

Figure 4

2050

8

.

0

5

.

2

5

.

2

5110

−

−

−

∗

=

+

o

up

V

R

2050

)

(

5110

)

5

.

2

(

−

−

∗

−

=

−

−

o

out

o

down

V

V

V

R