Description

The FAN7528 is an active power factor correction (PFC) controller for boost PFC applications that operates in critical conduction mode (CRM). It uses voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MOSFET turn-off signal. Because the voltage mode CRM PFC controller does not need the rectified AC line voltage information, it can save the power loss of the input voltage sensing network necessary for the current mode CRM PFC controller.

Features

■ Low Total Harmonic Distortion (THD)

■ Dual Output Voltage Control

■ Precise Adjustable Output Over-Voltage Protection

■ Open-Feedback Protection and Disable Function

■ Zero Current Detector

■ 160µs Internal Start-up Timer

■ MOSFET Over-Current Protection

■ Under-Voltage Lockout with 3.5V Hysteresis

■ Low Start-up (40µA) and Operating Current (1.5mA)

■ Totem-Pole Output with High State Clamp

■ ±400mA Peak Gate Drive Current

■ 8-Pin DIP or 8-Pin SOP

Applications

■ Adapter