Application Notes

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

PT6100/6210/6300 Series

Adjusting the Output Voltage of Power Trends’

Wide Input Range Bus ISRs

The output voltage of the Power Trends’ Wide Input

Range 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 for either series as V

and V

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:

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

2. Never connect capacitors from V

V

the stability of the ISR.

3. Adjustments to the output voltage may place additional

limits on the maximum and minimum input voltage for the

part. The revised maximum and minimum input voltage

limits must comply with the following requirements. Note

that the minimum input voltage limits are also model

dependant.

V

= (8 x V

whichever is less.

V

= (V

whichever is greater.

V

V

= (V

whichever is greater.

V

o

≥10V;

V

= (V

Figure 1

also be calculated using the following formulae.

(R1)

=

k

Ω

k

Ω

R2

=

Where: V

o

= Original output voltage

V

a

= Adjusted output voltage

R

o

= The resistance value fromTable 1

Table 1

ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS

1Adc Rated

PT6102

PT6101

PT6103

2Adc Rated

PT6213

PT6212

PT6214

3Adc Rated

PT6303

PT6302

PT6304

Vo (nom)

3.3

5.0

5.0

12.0

Va (min)

1.89

1.88

2.18

2.43

Va (max)

6.07

11.25

8.5

22.12

Ro (k

Ω

Ω

Ω

Ω

Ω)

66.5

150.0

90.9

243.0

R2

Adjust

Up

C1

1

µF Ceramic

(Optional)

C2

100

µF

(Req’d)

Vo

COM

COM

Vin

+

(R1)

Adj Down

PT6100/6200/6300

9,10,11

12

5,6,7,8

2,3,4

Vin

Vo

G N D

Vo(adj)