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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

R

=10k

x

SET

W

0.69

V

-0.69

O

-1.43kW

(1)

5

3

4

6

7

GND

GND

8

GND

+Sense

−Sense

V Adj

O

PTH08T240W/241W

1%

0.05W

+Sense

−Sense

PTH08T240W, PTH08T241W

SLTS264E – NOVEMBER 2005 – REVISED FEBRUARY 2007

number of standard voltages, along with the actual output voltage that this resistance value provides.

For other output voltages, the value of the required resistor can either be calculated using the following formula,

or simply selected from the range of values given in Table 2. Figure 11 shows the placement of the required

resistor.

0.169

5.005

3.3

1.21

3.304

2.5

2.37

2.506

1.8

4.75

1.807

1.5

6.98

1.510

12.1

1.200

20.5

1.004

681

0.700

(1)

(2)

voltage is a function of switching frequency and may increase or decrease when the Smart Sync

feature is utilized. Please review the Smart Sync application section for further guidance.

(1)

resistor directly between pins 8 and 7, as close to the regulator as possible, using dedicated PCB traces.

(2)

affects the stability of the regulator.

11

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