APW7159A SOP-20

Dual Channel Synchronous Buck PWM Controller for SMPS

The APW7159A is a dual channel voltage mode and synchronous PWM controller which drives dual N-channel MOSFETs. The two channels are operated with 180 degree phase shift. The device integrates all of the control, monitoring, and protecting functions into a single package; provides two controlled power output with over-voltage, overtemperature, and over-current protections. The APW7159A provides excellent regulation for output load variation. The internal 1.0V temperature-compensated reference voltage provides high accuracy of 0.8% over line and temperature. The device includes a 50kHz free-running triangle-wave oscillator that is adjustable from 50kHz to 400kHz. PWM Controller 1 PWM Controller 2 APW7159A VOUT2 VIN VOUT1 Phase Shift The APW7159A has been equipped with excellent protection functions: POR, OCP, UVP, and OVP protections. The Power-On-Reset (POR) circuit can monitor the VCC and OCSET voltage to make sure the supply voltage exceeds their threshold voltage while the controller is running. The Over-Current Protection (OCP) monitors the output current by using the voltage drop across the high side MOSFET’s RDS(ON). When the output current reaches the trip point, the controller will be latched. Under-Voltage Protection (UVP) and Over-Voltage Protection (OVP) monitor the FB voltage to protect APW7159A from burnout when output voltage is under 50% or over 120% of normal output voltage. The APW7159A is available in SOP-20 package