PTH05010WAST datasheet(7/19 Pages) TI2

7 / 19 page

Application Notes

For technical support and more information, visit http://power.ti.com

Adjusting the Output Voltage of the PTH03010W &

PTH05010W Wide-Output Adjust Power Modules

The Vo Adjust control (pin 4) sets the output voltage of

the PTH03010W and PTH05010W products. The

adjustment range of the PT03010W (3.3-V input) is

from 0.8 V to 2.5 V 1, and the PTH05010W (5-V input)

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 Vo Adjust and GND pins 2.

Table 2-1 gives the preferred 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 2-2.

Figure 2-1 shows the placement of the required resistor.

Rset

= 10 k

Ω ·

0.8 V

– 2.49 k

Ω

Vout – 0.8 V

Figure 2-1; Vo Adjust Resistor Placement

Notes:

1. Modules that operate from a 3.3-V input bus should

not be adjusted higher than 2.5 V.

2. Use a 0.1 W resistor. 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 4 and 7 using dedicated

PCB traces.

3. Never connect capacitors from Vo Adjust to either GND or

Vout. Any capacitance added to the Vo Adjust pin will affect

the stability of the regulator.

PTH05010W

OUT

330µF

GND

OUT

O Sense [Note 3]

O Adj

GND

O Sense

OUT

SET

0.1 W, 1 %

GND

0.800

Open

0.825

318 k

Ω

0.850

158 k

Ω

0.875

104 k

Ω

0.900

77.5 k

Ω

0.925

61.5 k

Ω

0.950

50.8 k

Ω

0.975

43.2 k

Ω

1.000

37.5 k

Ω

1.025

33.1 k

Ω

1.050

29.5 k

Ω

1.075

26.6 k

Ω

1.100

24.2 k

Ω

1.125

22.1 k

Ω

1.150

20.4 k

Ω

1.175

18.8 k

Ω

1.200

17.5 k

Ω

1.225

16.3 k

Ω

1.250

15.3 k

Ω

1.275

14.4 k

Ω

1.300

13.5 k

Ω

1.325

12.7 k

Ω

1.350

12.1 k

Ω

1.375

11.4 k

Ω

1.400

10.8 k

Ω

1.425

10.3 k

Ω

1.450

9.82 k

Ω

1.475

9.36 k

Ω

1.50

8.94 k

Ω

1.55

8.18 k

Ω

1.60

7.51 k

Ω

1.65

6.92 k

Ω

1.70

6.4 k

Ω

1.75

5.93 k

Ω

1.80

5.51 k

Ω

1.85

5.13 k

Ω

1.90

4.78 k

Ω

1.95

4.47 k

Ω

Vout (Standard)

Rset (Pref’d Value)

Vout (Actual)

3.3 V 1

698

Ω

3.309V

2.5 V

2.21 k

Ω

2.502 V

2 V

4.12 k

Ω

2.010 V

1.8 V

5.49 k

Ω

1.803 V

1.5 V

8.87 k

Ω

1.504 V

1.2 V

17.4 k

Ω

1.202 V

1 V

36.5 k

Ω

1.005 V

0.8 V

Open

0.8 V

Table 2-1; Preferred Values of Rset for Standard Output Voltages

PTH03010W & PTH05010W

Table 2-2; Output Voltage Set-Point Resistor Values

Va Req’dRset

2.00

4.18 k

Ω

2.05

3.91 k

Ω

2.10

3.66 k

Ω

2.15

3.44 k

Ω

2.20

3.22 k

Ω

2.25

3.03 k

Ω

2.30

2.84 k

Ω

2.35

2.67 k

Ω

2.40

2.51 k

Ω

2.45

2.36 k

Ω

2.50

2.22 k

Ω

2.55

2.08 k

Ω

2.60

1.95 k

Ω

2.65

1.83 k

Ω

2.70

1.72 k

Ω

2.75

1.61 k

Ω

2.80

1.51 k

Ω

2.85

1.41 k

Ω

2.90

1.32 k

Ω

2.95

1.23 k

Ω

3.00

1.15 k

Ω

3.05

1.07 k

Ω

3.10

988

Ω

3.15

914

Ω

3.20

843

Ω

3.25

775

Ω

3.30

710

Ω

3.35

647

Ω

3.40

587

Ω

3.45

529

Ω

3.50

473

Ω

3.55

419

Ω

3.60

367

Ω

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