Controller drives an external MOSFET to emulate an ideal diode
05-02-2016 | Texas Instruments | Power
The Texas Instruments (TI) LM74670-Q1 is a controller device that can be
used with an N-Channel MOSFET in full or half bridge rectifier architectures
for alternators. It is designed to drive an external MOSFET to emulate an
ideal diode.
A novel advantage of this scheme is that it is not ground referenced, thus
it has zero IQ. The Schottky diodes in full or half bridge rectifiers and
alternators can be replaced with the LM74670-Q1 solution to avoid forward
conduction diode losses and produce more efficient AC/DC converters.
The LM74670-Q1 controller provides a gate drive for external N-Channel
MOSFET and a fast response internal comparator to pull-down the MOSFET Gate
in the event of reverse polarity. The device can support an AC signal
frequency up to 300Hz, says the company.
By Electropages
LM74670-Q1
