www.ti.com

APPLICATION INFORMATION

Adjusting the Output Voltage of the PTH04000W Wide-Output Adjust Power Modules

R

SET

= 10 k

x

W

0.891 V

V

- 0.9 V

O

- 3.24 kW

VI

GND

GND

1

5

6

3

4

2

Track

GND

Inhibit

V Adj

O

C

47 F

(Required)

I

µ

PTH04000W

C

47 F

(Optional)

O

µ

R

0.05 W

1%

SET

PTH04000W

SLTS247A – JUNE 2005 – REVISED JULY 2005

number of common bus voltages, along with the actual voltage the resistance produces.

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 9 shows the placement of the required

resistor.

Voltages

(Required)

(Standard Value)

(Actual)

475

Ω

3.298 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

(1)

greater.

(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 5 and 1

using dedicated PCB traces.

(2)

stability of the regulator.

7