ATH30T033 datasheet(7/16 Pages) ASTEC

Part #	ATH30T033

Description	30-A, 3.3-V Input Non-Isolated Wide-Output Adjust Power Module

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Manufacturer	ASTEC [Astec America, Inc]

Direct Link	http://www.astecinc.com/

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Application Notes

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Adjusting the Output Voltage of the ATH30T033

& ATH30T05 Wide-Output Adjust Power Modules

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

ATH30T033 and ATH30T05 products to a value higher than

0.8 V. The adjustment range of the ATH30T033 (3.3-V

input) is from 0.8 V to 2.5 V1, and the ATH30T05 (5-V input)

from 0.8 V to 3.6 V. For an output voltage other than

0.8 V a single external resistor, Rset, 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 num-

ber 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; V

o

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 5 and 10 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.

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 R

set

for Standard Output Voltages

ATH30T033 & ATH30T05 Series

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

Va Req’d

Rset

Va Req’d

Rset

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

C

OUT

330 µF

(Optional)

GND

V

OUT

V

o Sense

R

SET

1 %, 0.1 W

PTH05030W

1, 3, 7

13

6

8, 9

12

11

5

GND

Adjust

V

O

Sense

10

GND

ATH30T05-9S

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