PTH05050WAST datasheet(6/22 Pages) TI

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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

Rset + 10 kW

0.8 V

Vout * 0.8 V

*2.49 kW

(1)

VIN

CIN

100

µF

(Required)

COUT

100

µF

(Optional)

GND

VOUT

RSET

1 %

0.1 W

PTH05050W

Track

V IN

GND

Inhibit

PTH05050W

SLTS213D – MAY 2003 – REVISED JUNE 2007

The Vo Adjust control (pin 5) sets the output voltage to value higher than 0.8 V. The adjustment range of the

PTH05050W is from 0.8 V to 3.6 V. The adjustment method requires the addition of a single external resistor,

RSET, that must be connected directly between the VOAdjust and GND pins. Table 1 gives the standard 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 can either be calculated using the following formula,

or simply selected from the range of values given in Table 2. Figure 5 shows the placement of the required

resistor.

Table 1. Values of RSET for Standard Output Voltages

VO (Standard) (V)

RSET (Standard Value) (kΩ)

VO (Actual) (V)

3.3

0.698

3.309

2.5

2.21

2.502

4.12

2.010

1.8

5.49

1.803

1.5

8.87

1.504

1.2

17.4

1.202

36.5

1.005

0.8

Open

0.8

Figure 5. VO Adjust Resistor Placement

NOTES:

1. A 0.05-W 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 pins

5 and 1 using dedicated PCB traces.

2. Never connect capacitors from VOAdjust to either GND or VO. Any capacitance added to the VOAdjust pin

will affect the stability of the regulator.

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