Application Notes

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Adjusting the Output Voltage of the PT6980

Dual-Output Voltage Regulators

Each output voltage from the PT6980 series of integrated

switching regulators (ISRs) can be independently adjusted

higher or lower than the factory trimmed pre-set voltage.

Refer to Figure 1 and Table 2 for both the placement and value of

the required resistor.

Notes:

possible.

Figure 1

C

1

+

C

2

+

C

3

+

R4

(R3)

(R1)

R2

L

O

A

D

L

O

A

D

Adj Down

Adjust Up

V

IN

COM

COM

Vo

2

Vo

1

PT6980

18 - 21

23

7 - 11

4,5,6

Vin

Vo

2

GND

Vo

Vo

1

16

Vo

12 - 15

Vo

1

Vo

22

STBY

3

Adjust Vo

1

Adjust Vo

2

respectively, a zero ohm link. Refer to the Table 1

footnotes for guidance.

pins will affect the stability of the respective regulated

output.

power dissipation in the regulator, and change the

maximum current available at either output. Consult

loading.

The adjust up and adjust down resistor values can also be

calculated using the following formulas. Be sure to select

the correct formula parameter from Table 1 for the output

and model being adjusted.

=

k

Ω

=

k

Ω

PT6980 Series