PT6103C datasheet(3/8 Pages) TI1

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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

a (min)

and V

a (max).

Adjust Up:

An increase in the output voltage is obtained by

adding a resistor R2, between pin 12 (Vo adjust) and pins 5-8

(GND).

Adjust Down:

Add a resistor (R1), between pin 12 (Vo adjust)

and pins 9-11(Vout).

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

of the required resistor; either (R1) or R2 as appropriate.

Notes:

1. Use only a single 1% resistor in either the (R1) or R2

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

2. Never connect capacitors from V

o adjust to either GND or

out. Any capacitance added to the Vo adjust pin will affect

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.

in (max)

= (8 x V

a)V or

*30/38V,

whichever is less.

*Limit is 30V when inhibit function is active.

PT6x0x/PT6x1x series:

in (min)

= (V

a + 4)V or 9V,

whichever is greater.

PT6x2x series:

o <10V;

in (min)

= (V

a + 2.0)V or 7.0V,

whichever is greater.

≥10V;

in (min)

= (V

a + 2.5)V

Figure 1

The values of (R1) [adjust down], and R2 [adjust up], can

also be calculated using the following formulae.

Ro (Va – 1.25)

(R1)

Vo – Va

Ω

1.25 Ro

Ω

Va – Vo

Where: V

= Original output voltage

= Adjusted output voltage

= 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

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)

66.5

150.0

90.9

243.0

Adjust

µF Ceramic

(Optional)

100

µF

(Req’d)

COM

Vin

(R1)

Adj Down

PT6100/6200/6300

9,10,11

5,6,7,8

2,3,4

Vin

G N D

Vo(adj)

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