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FAN6921ML

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

Fairchild Semiconductor 

June 2010

FAN6921ML

Integrated Critical Mode PFC/Quasi-Resonant

Current Mode PWM Controller

Features

ƒ Integrated PFC and Flyback Controller

ƒ Critical Mode PFC Controller

ƒ Zero-Current Detection for PFC Stage

ƒ Quasi-Resonant Operation for PWM Stage

ƒ Internal Minimum toff 8µs for QR PWM Stage

ƒ Internal 10ms Soft-Start for PWM

ƒ Brownout Protection

ƒ H/L Line Over-Power Compensation (OPC)

ƒ Latched Protection (FB Pin)

− Over-Power/ Overload Protection

− Short-Circuit Protection

− Open-Loop Protection

ƒ Externally Latch Triggering (RT Pin)

ƒ Adjustable Over-Temperature Latched (RT Pin)

ƒ VDD Pin & Output Voltage OVP (Latched)

ƒ Internal Temperature Shutdown (140°C)

Applications

ƒ AC/DC NB Adapters

ƒ Open-Frame SMPS

ƒ Battery Charger

Description

The highly integrated FAN6921ML combines a Power

Factor Correction (PFC) controller and a Quasi-

Resonant PWM controller. Integration provides cost-

effect design and allows for fewer external components.

For PFC, FAN6921ML 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, FAN6921ML can reduce

input current distortion at zero-crossing duration to

improve THD performance.

For PWM, FAN6921ML enhances the power system

performance through valley detection, green-mode

operation, and high / low line over power compensation.

FAN6921ML provides: secondary-side open-loop and

over-current protection, external latch 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 brownin/out for AC input voltage

under-voltage protection (UVP).

The FAN6921ML controller is available in a 16-pin small

outline package (SOP).

Ordering Information

Part Number

OLP Mode

Operating

Temperature Range

Package

FAN6921MLMY

Latch

-40°C to +105°C 16-Pin Small Outline Package (SOP)

Packing

Method

Tape & Reel

© 2010 Fairchild Semiconductor Corporation

FAN6921ML • Rev. 1.0.1

www.fairchildsemi.com

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