FAN6921MR

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 tOFF 8µs for QR PWM Stage
 Internal 10ms 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°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 overtemperature shutdown, VDD pin OVP, and DET pin overvoltage 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).