Smart diode rectifier controller drives external MOSFET to emulate ideal diode
23-02-2016 |
Mouser Electronics
|
Power
The Texas Instruments (TI) LM74670-Q1 smart diode rectifier controller is
now available from Mouser stock. The controller device can be used with an
N-Channel MOSFET in full or half bridge rectifier architectures for
alternators in applications such as AC rectifiers, alternators, power tools
and for reverse-polarity protection.
The device 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. This device can support an AC signal
frequency up to 300Hz.
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