TPIC2603 Datasheet, PDF (9/17 Pages) Texas Instruments – 6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER

TPIC2603
6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER
SLIS056A – FEBRUARY 1995 – REVISED MARCH 1996
PRINCIPLES OF OPERATION
fault sense/protection circuitry
over-current/short-to-battery sensing and protection
The internal fault protection circuitry of the TPIC2603 monitors the drain current for each channel. Each channel
offers two levels of protection from over-current conditions. The first level is a current-limit protection which
through the internal FET prevents the switching current from exceeding the on-state current limit. The second
level of protection transits the output to a low duty cycle PWM mode when the current exceeds the over-current
sense threshold. The PWM mode protection is enabled approximately 70 µs after the output has been turned
on. The output remains in the PWM mode until the shorted-load condition has been corrected and then
automatically returns to normal operation. Figure 5 illustrates device operation under an over-current or
shorted-load condition.
NORMAL
Control
Register
DRAIN
Fault
Register
Glitches
t(stb)
SHORTED-LOAD
Control
Register
DRAIN
Glitches
DRAIN
tw(sense)
tcyc(ref)
Fault
Register
t(stb)
Figure 5. Shorted-Load Condition
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