PTH12050LAH datasheet(9/26 Pages) TI1

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Equation 1. Output Voltage Adjust

Rset + 10 kW

0.8 V

Vout * Vmin

* RS kW

PTH12050W/L

SLTS214H – MAY 2003 – REVISED OCTOBER 2007

Use Equation 1 to calculate the adjust resistor value. See Table 2 for parameters, Rs and Vmin.

Table 2. Adjust Formula Parameters

OUTPUT VOLTAGE ADJUST EQUATION

Parameter

PTH12050W

PTH12050L

V(MIN)

1.2 V

0.8 V

V(MAX)

5.5 V

1.8 V

1.82 k

Ω

7.87 k

Ω

(1)

Table 3. Output Voltage Set-Point Resistor Values

PTH12050W

PTH12050L

VO(V)

RSET (kΩ)

VO (V)

RSET (kΩ)

VO(V)

RSET (kΩ)

1.200

Open

2.7

3.51

0.8

Open

1.225

318

2.75

3.34

0.825

312

1.250

158

2.8

3.18

0.85

152

1.275

105

2.85

3.03

0.875

98.8

1.300

78.2

2.9

2.89

0.9

72.1

1.325

62.2

2.95

2.75

0.925

56.1

1.350

51.1

3.0

2.62

0.95

45.5

1.375

43.9

3.05

2.49

0.975

37.8

1.400

38.2

3.1

2.39

1.0

32.1

1.425

33.7

3.15

2.27

1.025

27.7

1.450

30.2

3.2

2.18

1.05

24.1

1.475

27.3

3.25

2.08

1.075

21.2

1.50

24.8

3.3

1.99

1.1

18.8

1.55

3.35

1.91

1.125

16.7

1.60

18.2

3.4

1.82

1.15

1.65

3.5

1.66

1.175

13.5

1.70

14.2

3.6

1.51

1.2

12.1

1.75

12.7

3.7

1.38

1.225

1.80

11.5

3.8

1.26

1.25

9.91

1.85

10.5

3.9

1.14

1.275

8.97

1.90

9.61

4.0

1.04

1.3

8.13

1.95

8.85

4.1

0.939

1.325

7.37

2.00

8.18

4.2

0.847

1.35

6.68

2.05

7.59

4.3

0.761

1.375

6.04

2.10

7.07

4.4

0.680

1.4

5.46

2.15

6.6

4.5

0.604

1.425

4.93

2.20

6.18

4.6

0.533

1.45

4.44

2.25

5.8

4.7

0.466

1.475

3.98

2.30

5.45

4.8

0.402

1.5

3.56

2.35

5.14

4.9

0.342

1.55

2.8

2.40

4.85

5.0

0.285

1.6

2.13

2.45

4.58

5.1

0.231

1.65

1.54

2.50

4.33

5.2

0.180

1.7

1.02

2.55

4.11

5.3

0.131

1.75

0.551

2.60

3.89

5.4

0.085

1.8

0.130

2.65

3.7

5.5

0.041

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