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Rset + 10 kW

0.8 V

Vout * Vmin

* Rs kW

(1)

PTV12020

10, 11

7

3, 4

GND

GN D

1, 2

GND

330 mF

(Optional)

8

1%, 0.05W

PTV12020W/L

SLTS231A – NOVEMBER 2004 – REVISED FEBRUARY 2005

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 4. Equation 1 may be used for calculating the adjust resistor value. Select the

Table 3. Adjust Formula Parameters

Pt. No.

PTV12020W

PTV12020L

1.2 V

0.8 V

5.5 V

1.8 V

1.82 k

Ω

7.87 k

Ω

(1)

A 0.05-W rated resistor may be used. The tolerance should be 1%, with temperature stability of 100 ppm/

°C (or

better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pin 8 and pins 1

or 2, using dedicated PCB traces.

(2)

of the regulator.

11