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OUTPUT ON/OFF INHIBIT

PTH12060W

V

I

1

10

4

5

6

2

3

C

330 F

O

m

C

560 F

I

m

1 = Inhibit

GND

V

O

V Sense

O

9

8

Q1

BSS138

R

2k

1%

0.1 W

SET

W

7

GND

L

O

A

D

t − Time − 10 ms/div

PTH12010W, PTH12010L

SLTS205E–JUNE 2003–REVISED APRIL 2006

Inhibit for applications requiring output voltage on/off control, each series of the PTH family incorporates an

output Inhibit control pin. The inhibit feature can be used wherever there is a requirement for the output voltage

from the regulator to be turned off.

The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output

has its own internal pull-up to a potential of 5 V to 13.2 V (see footnotes to specification table). The input is not

compatible with TTL logic devices. An open-collector (or open-drain) discrete transistor is recommended for

control.

Figure 14. Inhibit Control Circuit

Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then

turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within

constant current load.

Figure 15. Power-Up from Inhibit Control

16

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