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FAN6920

Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller

Fairchild Semiconductor 

April 2011

FAN6920MR

Integrated Critical-Mode PFC and Quasi-Resonant

Current-Mode PWM Controller

Features

 Integrated PFC and Flyback Controller

 Critical-Mode PFC Controller

 Zero-Current Detection for PFC Stage

 Quasi-Resonant Operation for PWM Stage

 Internal Minimum 5µs tOFF for QR PWM Stage

 Internal 5ms Soft-Start for PWM

 Brownout Protection

 High / Low Line Over-Power Compensation

 Auto-Recovery Over-Current Protection

 Auto-Recovery Open-Loop Protection

 Externally Auto-Recovery Triggering (RT Pin)

 Adjustable Over-Temperature Protection

 VDD Pin and Output Voltage OVP (Auto-Recovery)

 Internal Over-Temperature Shutdown (140°C)

Applications

 AC/DC NB Adapters

 Open-Frame SMPS

 Battery Charger

Description

The highly integrated FAN6920MR combines Power

Factor Correction (PFC) controller and quasi-resonant

PWM controller. Integration provides cost-effective

design and reduces external components.

For PFC, FAN6920MR uses a controlled on-time

technique to provide a regulated DC output voltage and

to perform natural power-factor correction. With an

innovative THD optimizer, FAN6920MR can reduce

input current distortion at zero-crossing duration to

improve THD performance.

For PWM, FAN6920MR provides several functions to

enhance the power system performance: valley

detection, green-mode operation, and high / low line

over-power compensation. Protection functions include

secondary-side open-loop and over-current with auto-

recovery protection; external auto-recovery triggering;

adjustable over-temperature protection by RT pin; and

external NTC resistor, internal over-temperature

shutdown, VDD pin OVP, and DET pin over-voltage for

output OVP, and brown-in / out for AC input voltage

UVP.

The FAN6920MR controller is available in a 16-pin

small-outline package (SOP).

Ordering Information

Part Number

FAN6920MRMY

OLP Mode

Recovery

Operating

Temperature Range

-40°C to +105°C

Package

16-Pin Small Outline Package (SOP)

Packing

Method

Tape & Reel

© 2010 Fairchild Semiconductor Corporation

FAN6920MR • Rev. 1.0.3

www.fairchildsemi.com

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