SLTS027B datasheet(3/6 Pages) TI

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Application Notes

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

PT5060 Series

Adjusting the Output Voltage of the PT5060

Dual-Output Boost Converter Series

The dual output voltage of the PT5060 series modules

can be adjusted higher or lower than the factory pre-set

voltage with the addition of a single external resistor.

Table 1 gives the applicable adjustment range for each

model in the series as Va (min) and Va (max).

Adjust Up:

An increase in the output voltage is obtained

by adding a resistor R2, between pin 11 (Vo adj) and pins

2, 6, or 7 (GND).

Adjust Down:

Add a resistor (R1), between pin 11 (Vo adj)

and pins 8, 9 or 10 (Vo1).

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. Both the positive and negative voltage outputs from the

ISR are adjusted simultaneously.

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

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

3. Never connect capacitors from Vo adj to either GND or

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

the stability of the ISR.

4. An increase in the output voltage must be accompanied by

a corresponding reduction in the specified maximum

current at each output. For Vo1 and –Vo2, the revised

maximum output current must be reduced to the

equivalent of 6 watts and 3 watts respectively. i.e.

Io1 (max)

Adc

and

Io2 (max)

Adc,

where Va is the adjusted output voltage.

5. Adjustments to the output voltage will also limit the

maximum input voltage that can be applied to the ISR.

The maximum input voltage that may be applied is limited

to (Vo – 1)Vdc or 14Vdc, whichever is less.

Table 1

PT5060 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt #

PT5061

PT5062

Vo (nom)

±12.0V

±15.0V

Va (min)

± 7.5V

Va (max)

±14.0V

±20.0V

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

also be calculated using the following formulas.

3.65 (Va – 2.5 )

(R1)

(Vo – Va)

- 0.1

kΩ

9.125

- 0.1

kΩ

Va - Vo

Where:

Vo = Original output voltage

Va = Adjusted output voltage

Figure 1

Table 2

PT5060 ADJUSTMENT RESISTOR VALUES

Series Pt #

PT5061

PT5062

Current

0.5/0.25Adc

0.4/0.2Adc

Vo(nom)

±12.0Vdc

±15.0Vdc

Va(req’d)

7.0

7.5

(4.0)k

Ω

(2.3)k

Ω

8.0

(4.9)k

Ω

(2.8)k

Ω

8.5

(6.2)k

Ω

(3.3)k

Ω

9.0

(7.8)k

Ω

(3.9)k

Ω

9.5

(10.1)k

Ω

(4.6)k

Ω

10.0

(13.6)k

Ω

(5.4)k

Ω

10.5

(19.4)k

Ω

(6.4)k

Ω

11.0

(30.9)k

Ω

(7.7)k

Ω

11.5

(65.6)k

Ω

(9.3)k

Ω

12.0

(11.5)k

Ω

12.5

18.2k

Ω

(14.5)k

Ω

13.0

9.0k

Ω

(19.1)k

Ω

13.5

6.0k

Ω

(26.7)k

Ω

14.0

4.5k

Ω

(41.9)k

Ω

14.5

(87.5)k

Ω

15.0

15.5

18.2k

Ω

16.0

9.0k

Ω

16.5

6.0k

Ω

17.0

4.5k

Ω

17.5

3.6k

Ω

18.0

2.9k

Ω

18.5

2.5k

Ω

19.0

2.2k

Ω

19.5

1.9k

Ω

20.0

1.7k

Ω

R1 = (Blue)

R2 = Black

out

100

µF

Adjust Up

Adj Down

– Vo

COM

+Vo

PT5060

2,6,7

3,4,5

Vin

– Vo

GND

Vo(adj)

8,9,10

+Vo

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