Datasheet

OUT
IN
GND
FAULT
ILIM
EN
Input
PowerPad
Output
0.1 Fm
R
100k
FAULT
W
C
0.1 F
RETRY
m
R
20k
ILIM
W
C
LOAD
R
LOAD
TPS2553
OUT
IN
GND
FAULT
ILIM
EN
ExternalLogic
Signal & Driver
PowerPad
Output
Input
0.1 Fm
R
100k
FAULT
W
C
0.1 F
RETRY
m
R
20k
ILIM
W
C
LOAD
R
LOAD
TPS2553
TPS2552, TPS2553
TPS2552-1, TPS2553-1
www.ti.com SLVS841E –NOVEMBER 2008– REVISED FEBRUARY 2012
AUTO-RETRY FUNCTIONALITY
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
low, and FAULT goes high impedance allowing C
RETRY
to begin charging. The part re-enables when the voltage
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 figure below shows how an external logic signal can drive EN through R
FAULT
and maintain auto-retry
functionality. The resistor/capacitor time constant determines the auto-retry time-out period.
Figure 26. Auto-Retry Functionality With External EN Signal
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Product Folder Link(s): TPS2552 TPS2553 TPS2552-1 TPS2553-1