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ADJUSTING THE OUTPUT VOLTAGE OF THE PTH04040W WIDE-OUTPUT ADJUST POWER

Rset + 10 kW

0.8 V

Vout * 0.8 V

* 2.49 kW

(1)

RSET

1%

0.05 W

PTH04040W

12

15

9

10 13

16

11

14

18

+Sense

−Sense

GND

Track

Adjust

17

GND

GND

PTH04040W

SLTS238A – SEPTEMBER 2005 – REVISED FEBRUARY 2006

MODULE

preferred value of the external resistor for a 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 is calculated using the following formula, or by

selecting from the range of values given in Table 3. Figure 9 shows the placement of the required resistor.

2.5 V

2.21

Ω

2.502 V

2 V

4.12

Ω

2.010 V

1.8 V

5.49

Ω

1.803 V

1.5 V

8.87

Ω

1.504 V

1.2 V

17.4

Ω

1.202 V

1 V

36.5

Ω

1.005 V

0.8 V

Open

0.8 V

(1)

The nominal input voltage must be at least 2

× V

11

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