Synchronous Buck PWM And Linear ControllerThe APW7067N integrates synchronous buck PWM and
linear controller, as well as monitoring and protection
functions into a single package. The synchronous PWM
controller drives dual N-Channel MOSFETs which provides
one controlled power output with under-voltage and over-
current protections. Linear controller drives an external
N-Channel MOSFET with under-voltage protection.
The APW7067N provides excellent regulation for output
load variation. An internal 0.8V temperature-compensated
reference voltage is designed to meet the requirement
of low output voltage applications. The switching frequency
is adjustable from 150kHz to 1000kHz.
The APW7067N with excellent protection functions: POR,
OCP and UVP. The Power-On-Reset (POR) circuit CAN
monitor VCC12 supply voltage exceeds its threshold
voltage while the controller is running, and a built-in
digital soft-start provides both outputs with controlled
rising voltage. The Over-Current Protection (OCP)
monitors the output current by using the voltage drop
across the lower MOSFET s R , comparing with
DS(ON)
internal V (0.25V), eliminating the need for a current
OCP
sensing resister. When the output current reaches the
trip point, the controller will shutdown the IC directly, and
latch the converter,s output. The Under-Voltage Protection
(UVP) monitors the voltages of FB and FBL pins for short-
Circuit Protection When the V or V is less than 50%
FB FBL
of V , the controller will shutdown the IC directly.
REF By Anpec Electronics Corporation
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