AUTO-RETRY FUNCTIONALITY

OUT

IN

GND

FAULT

ILIM

EN

Input

PowerPad

Output

0.1 F

m

R

100k

FAULT

W

C

0.1 F

RETRY

m

R

20k

ILIM

W

TPS2553

OUT

IN

GND

FAULT

ILIM

EN

ExternalLogic

Signal & Driver

PowerPad

Output

Input

0.1 F

m

R

100k

FAULT

W

C

0.1 F

RETRY

m

R

20k

ILIM

W

TPS2553

TPS2552

TPS2553, TPS2552-1, TPS2553-1

Some applications require that an overcurrent condition disables the part momentarily during a fault condition

and re-enables after a pre-set time. This auto-retry functionality can be implemented with an external resistor and

capacitor. During a fault condition, FAULT pulls low disabling the part. The part is disabled when EN is pulled

on EN reaches the turnon threshold, and the auto-retry time is determined by the resistor/capacitor time

constant. The part will continue to cycle in this manner until the fault condition is removed.

Figure 25. Auto-Retry Functionality

Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal.

The resistor/capacitor time constant determines the auto-retry time-out period.

Figure 26. Auto-Retry Functionality With External EN Signal

20

Submit Documentation Feedback

Copyright © 2008–2009, Texas Instruments Incorporated

Product Folder Link(s): TPS2552 TPS2553 TPS2552-1 TPS2553-1