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February 2013
?2009 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN6921MR Rev. 1.0.4
 
FAN6921MR
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 t
OFF
 8 祍 for QR PWM Stage
?   Internal 10 ms Soft-Start for PWM 
?   Brownout Protection 
?   High / Low Line Over-Power Compensation 
?   Auto-Recovery Over-Current Protection 
?   Auto-Recovery Open-Loop Protection 
?   Externally Latch Triggering (RT Pin) 
?   Adjustable Over-Temperature Latched (RT Pin) 
?   VDD Pin and Output Voltage OVP (Latched) 
?   Internal Over-Temperature Shutdown (140?/SPAN>C) 
Applications
?   AC/DC NB Adapters 
?   Open-Frame SMPS 
?   Battery Charger 
 
Description
The highly integrated FAN6921MR combines Power
Factor Correction (PFC) controller and Quasi-Resonant
PWM controller. Integration provides cost effect design
and allows for fewer external components.
For   PFC,   FAN6921MR   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, FAN6921MR can reduce
input current distortion at zero-crossing duration to
improve THD performance.
For PWM, FAN6921MR provides several functions to
enhance   the   power   system   performance:   valley
detection, green-mode operation, high / low line over
power   compensation.   FAN6921MR   provides   many
protection functions as well: secondary-side open-loop
and over-current with auto recovery protection, external
latch triggering, adjustable over-temperature protection
by RT pin and external NTC resistor, internal over-
temperature shutdown, V
DD
 pin OVP, and DET pin over-
voltage for output OVP, and brown-in / out for AC input
voltage UVP.
The FAN6921MR controller is available in a 16-pin small
outline package (SOP).
Ordering Information
Part Number
OLP
Mode
Operating
Temperature Range
Package
Packing
Method
FAN6921MRMY
Recovery
-40癈 to +105癈
16-Pin Small Outline Package (SOP)     Tape & Reel
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