FA7711V Datasheet, PDF (17/25 Pages) Fuji Electric – FUJI Power Supply Control IC

FA7711V
（7）Output circuit
The IC contains a push-pull output stage and can
directly drive MOSFETs. The maximum peak current
of the output stage is sink current of +800mA, and
source current of - 800mA. The IC can also drive
NPN and PNP transistors. The maximum current in
such cases is ± 50mA. You must design the output
current considering the rating of power dissipation.
(See Design Advice)
You can switch the types of external discrete
MOSFETs by wiring of the SEL pins (Pin 3, Pin 5).
For driving Nch MOS, connect the SEL pins to GND.
For driving Pch MOS, connect the SEL pins to VREF.
You can design buck converter or inverting converter
by driving Pch MOS, and boost converter by driving
Nch MOS.
Connect them either to GND or to VREF surely.
（8）Under voltage lockout circuit（UVLO）
The IC contains a under voltage lockout circuit to
protect the circuit from the damage caused by
malfunctions when the supply voltage drops. When
the supply voltage rises from 0V, the IC starts to
operate at VCC of 3.3V(typ.) and outputs generate
pulses. If a drop of the supply voltage occurs, it stops
output at VCC of 3.2V(typ.). When it occurs, the CS1
and CS3 pin are turned to low level and the CS2 pin
to high level, and then these pins are reset.
Fuji Electric Systems Co., Ltd.
AN-060E Rev.1.0
17
Jun-2010
http://www.fujielectric.co.jp/fdt/scd/