Datasheet

TPS24720
SLVSAL1C –MARCH 2011–REVISED SEPTEMBER 2013 www.ti.com
AUTOMATIC RESTART
If LATCH is connected to GND, then the TPS24720 automatically initiates a restart after a fault has caused it to
turn off the external MOSFET M
1
. Internal control circuits use C
T
to count 16 cycles before re-enabling M
1
as
shown in Figure 35. This sequence repeats if the fault persists. The timer has a 1 : 1 charge-to-discharge current
ratio. For the very first cycle, the TIMER pin starts from 0 V and rises to the upper threshold of 1.35 V and
subsequently falls to 0.35 V before restarting. For the following 16 cycles, 0.35 V is used as the lower threshold.
This small duty cycle often reduces the average short-circuit power dissipation to levels associated with normal
operation and eliminates special thermal considerations for surviving a prolonged output short.
Figure 35. Auto-Restart Cycle Timing
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