Application Notes

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Adjusting the Output Voltage of the PTH12000x

Wide-Output Adjust Power Modules

the PTH12000 product. The adjustment range is from

1.2 V to 5.5 V for the W-suffix modules, and 0.8 V to

1.8 V for L-suffix modules. The adjustment method

external resistor for a number of standard voltages, along

with the actual output voltage that this resistance value

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

resistor.

Notes:

1. A 0.05-W rated resistor may be used. 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.

PTH12000W

PTH12000L

5 V

280

Ω

5.009 V

N/A

N/A

3.3 V

2.0 k

Ω

3.294 V

N/A

N/A

2.5 V

4.32 k

Ω

2.503 V

N/A

N/A

2 V

8.06 k

Ω

2.010 V

N/A

N/A

1.8 V

11.5 k

Ω

1.801 V

130

Ω

1.800 V

1.5 V

24.3 k

Ω

1.506 V

3.57 k

Ω

1.499 V

1.2 V

Open

1.200 V

12.1 k

Ω

1.201 V

1.1 V

N/A

N/A

18.7 k

Ω

1.101 V

1.0 V

N/A

N/A

32.4 k

Ω

0.999 V

0.9 V

N/A

N/A

71.5 k

Ω

0.901 V

0.8 V

N/A

N/A

Open

0.800 V

PTH12000 Series

PTH12000x

1

4

5

2

3

100µF

(Required)

100µF

(Optional)

Inhibit

GND

GND

GND

Inhibit

For other output voltages the value of the required resistor

can either be calculated, or simply selected from the range

of values given in Table 2-3. The following formula may

be used for calculating the adjust resistor value. Select

from Table 2.2.

= 10 k

Ω ·

0.8 V

k

Ω

Table 2.2; Adjust Formula Parameters

Pt. No.

PTH12000W

PTH12000L

1.2 V

0.8 V

5.5 V

1.8 V

1.82 k

Ω

7.87 k

Ω