Application Notes

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Adjusting the Output Voltage of the PTH05000W

Wide-Output Adjust Power Modules

the PTH05000Wproduct. The adjustment range is

from 0.9 V to 3.6 V. The adjustment method requires

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

can either be calculated using the following formula, or

simply selected from the range of values given in Table 2-2.

Figure 2-1 shows the placement of the required resistor.

= 10 k

Ω ·

0.891 V

– 3.24 k

Ω

Figure 2-1; V

o

Adjust Resistor Placement

Notes:

1. Use a 0.1 W resistor. The tolerance should be 1 %,

with a temperature stability of 100 ppm/°C (or better).

Place the resistor as close to the regulator as possible.

Connect the resistor directly between pins 4 and 1

using dedicated PCB traces.

the stability of the regulator.

0.900

Open

0.925

353 k

Ω

0.950

175 k

Ω

0.975

116 k

Ω

1.000

85.9 k

Ω

1.025

68.0 k

Ω

1.050

56.2 k

Ω

1.075

47.7 k

Ω

1.100

41.3 k

Ω

1.125

36.4 k

Ω

1.150

32.4 k

Ω

1.175

29.2 k

Ω

1.200

26.5 k

Ω

1.225

24.2 k

Ω

1.250

22.2 k

Ω

1.275

20.5 k

Ω

1.300

19.0 k

Ω

1.325

17.7 k

Ω

1.350

16.6 k

Ω

1.375

15.5 k

Ω

1.400

14.6 k

Ω

1.425

13.7 k

Ω

1.450

13.0 k

Ω

1.475

12.3 k

Ω

1.50

11.6 k

Ω

1.55

10.5 k

Ω

1.60

9.49 k

Ω

1.65

8.64 k

Ω

1.70

7.90 k

Ω

1.75

7.24 k

Ω

1.80

6.66 k

Ω

1.85

6.14 k

Ω

1.90

5.67 k

Ω

1.95

5.25 k

Ω

3.3 V

475

Ω

3.298V

2.5 V

2.32 k

Ω

2.502 V

2 V

4.87 k

Ω

1.999 V

1.8 V

6.65 k

Ω

1.801 V

1.5 V

11.5 k

Ω

1.504 V

1.2 V

26.1 k

Ω

1.204 V

1 V

84.5 k

Ω

1.001 V

0.9 V

Open

0.9 V

Table 2-1; Preferred Values of R

set

for Standard Output Voltages

Table 2-2; Output Voltage Set-Point Resistor Values

2.00

4.86 k

Ω

2.05

4.51 k

Ω

2.10

4.19 k

Ω

2.15

3.89 k

Ω

2.20

3.61 k

Ω

2.25

3.36 k

Ω

2.30

3.12 k

Ω

2.35

2.90 k

Ω

2.40

2.70 k

Ω

2.45

2.51 k

Ω

2.50

2.33 k

Ω

2.55

2.16 k

Ω

2.60

2.00 k

Ω

2.65

1.85 k

Ω

2.70

1.71 k

Ω

2.75

1.58 k

Ω

2.80

1.45 k

Ω

2.85

1.33 k

Ω

2.90

1.22 k

Ω

2.95

1.11 k

Ω

3.00

1.00 k

Ω

3.05

904

Ω

3.10

810

Ω

3.15

720

Ω

3.20

634

Ω

3.25

551

Ω

3.30

473

Ω

3.35

397

Ω

3.40

324

Ω

3.45

254

Ω

3.50

187

Ω

3.55

122

Ω

3.60

60

Ω

PTH05000W

V

IN

1

4

5

2

3

C

IN

330µF

(Required)

C

OUT

100µF

(Optional)

Inhibit

GND

GND

V

OUT

R

SET

0.1 W, 1 %

V

GND

Inhibit

V

IN

V

O

PTH05000W