3

Application

Notes

PT6500/PT6600 Series

More Application Notes

Adjusting the Output Voltage of the PT6500 and

PT6600 5V Bus Converters

The output voltage of the Power Trends PT6500/PT6600

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

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.

4. The minimum input voltage required by the part is

Figure 1

C

in

330

µF

+

C

out

330

µF

+

(R1)

Adj Down

R2

Adjust Up

Vo

COM

Vin

COM

PT6500/6600

11,12,13

14

7,8,9,10

4,5,6

Vin

Vo

G N D

Vo(adj)

STBY

3

V o(sense)

1

L

O

A

D

also be calculated using the following formulae.

(R1)

=

R2

=

Table 1

PT6500/6600 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt #

PT6505

PT6507

PT6502

PT6508

PT6506

PT6503

PT6501

PT6504

PT6605

PT6607

PT6602

PT6608

PT6606

PT6603

PT6601

PT6604

Vo (nom)

1.2

1.3

1.5

1.7

1.8

2.5

3.3

3.6

Va (min)

1.14

1.19

1.27

1.36

1.4

1.8

2.25

2.5

Va (max)

2.35

2.45

2.65

2.85

2.95

3.5

4.2

4.3

Ro (k

Ω

Ω

Ω

Ω

Ω)

2.49

2.49

2.49

2.49

2.49

4.99

12.1

10.0

Rs (k

Ω

Ω

Ω

Ω

Ω)

2.0

2.0

2.0

2.0

2.0

4.22

12.1

12.1