3

Application

Notes

PT6650 Series

More Application Notes

Adjusting the Output Voltage of the

PT6650 5Amp 24V Bus Converter Series

The output voltage of the Power Trends PT6650 Series ISRs

may be adjusted higher or lower than the factory trimmed pre-

set voltage with the addition of a single external resistor. Table 1

accordingly gives the allowable adjustment range for each model

Adjust Up:

An increase in the output voltage is obtained by

(GND).

Adjust Down:

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

Notes:

tion. Place the resistor as close to the ISR as possible.

3. If the Remote Sense feature is being used, connecting the

Sense) can benefit load regulation.

or 9V, whichever is higher.

5. For output voltages above 12.5Vdc, the maximum output

current must be limited to 4Adc.

also be calculated using the following formulae.

(R1)

=

R2

=

Figure 1

Table 1

PT6650 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt #

PT6652

PT6651

PT6653

PT6654

PT6656

PT6655

Vo (nom)

2.5V

3.3V

5.0V

9.0V

12.0V

15.0V

Va (min)

1.8V

2.2V

3.0V

6.0V

9.0V

10.0V

Va (max)

4.3V

4.7V

6.5V

10.2V

13.6V

17.0V

Ro (k

Ω

Ω

Ω

Ω

Ω)

4.99

4.22

2.49

2.0

2.0

2.0

Rs (k

Ω

Ω

Ω

Ω

Ω)

2.49

4.99

4.99

12.7

12.7

12.7

C

in

100

µF

+

C

out

330

µF

+

(R1)

Adj Down

R2

Adjust Up

Vo

COM

COM

Vin

L

O

A

D

PT6650

11,12,13

14

7,8,9,10

4,5,6

Vin

V o

G N D

Vo(adj)

STBY

3

Vsense

1