The TPS4005x is a family of high-voltage, wide
input (8 V to 40 V), synchronous, step-down
controllers. The TPS4005x family offers design
flexibility with a variety of user programmable
functions, including soft-start, UVLO, operating
frequency, voltage feed- forward, high-side
current limit, and loop compensation.
The TPS4005x are also synchronizable to an
external supply. They incorporate MOSFET gate
drivers for external N-channel high-side and
synchronous rectifier (SR) MOSFETs. Gate drive
logic incorporates anti-cross conduction circuitry
to prevent simultaneous high-side and
synchronous rectifier conduction.
The TPS4005x uses voltage feed-forward control
techniques to provide good line regulation over
the wide (4:1) input voltage range, and fast
response to input line transients with near
constant modulator gain with input variation which
eases loop compensation. The externally
programmable current limit provides
pulse-by-pulse current limit, as well as hiccup
mode operation utilizing an internal fault counter
for longer duration overloads.