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t − Time − 20 ms/div

(1 V/div)

Output Voltage Trim Adjustment

PTMA403033

PTMA402050

PTMA401120

SLTS259A – FEBRUARY 2006 – REVISED MARCH 2006

APPLICATION INFORMATION (continued)

Figure 13. Power-up Waveforms

An external resistor is required to increase or decrease the output voltage set point of the module by

± 10 %. The

The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or better). Place the resistor close to the

converter and connect it using dedicated PCB traces (see Figure 14). Table 1 gives the nearest standard value

of external resistor for the common voltages within each model's adjust range.

PTMA403033

PTMA402050

PTMA401120

(required)

(required)

(required)

down

up

down

up

down

up

3.0 V

118

—

4.5 V

18.7

—

10.8 V

64.9

—

3.1 V

187

—

4.6 V

24.9

—

11.0 V

80.6

—

3.2 V

392

—

4.7 V

35.7

—

11.2 V

105

—

3.3 V

open

open

4.8 V

57.6

—

11.4 V

143

—

3.4 V

—

249

4.9 V

121

—

11.6 V

221

—

3.5 V

—

124

5.0 V

open

open

11.8 V

464

—

3.6 V

—

82.5

5.1 V

—

124

12.0 V

open

open

—

—

—

5.2 V

—

61.9

12.2 V

—

118

—

—

—

5.3 V

—

40.2

12.4 V

—

57.6

—

—

—

5.4 V

—

29.4

12.6 V

—

36.5

—

—

—

5.5 V

—

23.2

12.8 V

—

26.1

—

—

—

—

—

—

13.0 V

—

19.6

—

—

—

—

—

—

13.2 V

—

15.8

11

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