SLTS030B datasheet(3/8 Pages) TI

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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 Va (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).

Figure 1

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

also be calculated using the following formulas. Refer to

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

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

Ro (Va – 1.25)

(R1)

Vo – Va

kΩ

1.25 Ro

kΩ

Va – Vo

Where: Vo = Original output voltage

Va = Adjusted output voltage

Ro = The resistance value fromTable 1

Table 1

ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS

1Adc Rated

PT6102

PT6101

PT6103

2Adc Rated

PT6216

PT6213

PT6212

PT6214

3Adc Rated

PT6314

PT6303

PT6302

PT6304

Vo (nom)

1.5

3.3

5.0

12.0

Va (min)

1.3

1.8

1.88

2.18

2.43

Va (max)

1.9

6.07

11.25

8.5

22.12

Ro (k

Ω

Ω)

8.25

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)

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 Vo adjust to either GND

or Vout. 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. The limits are model dependant.

PT6216/PT6314:

Vin (max) = (10 x Va)V or 17V, whichever is less.

Vin (min) = 9.0V

All other models:

Vin (max) = (8 x Va)V or as specified.

Vin (min) = (Va + 4)V or 9V, whichever is greater.

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