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 brown−in/out for AC input

voltage under−voltage protection (UVP).

The FAN6921ML controller is available in a 16−pin small outline

package (SOP).

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 8 s for QR PWM Stage

• Internal 10 ms Soft−Start for PWM

• Brownout Protection

• H/L Line Over−Power Compensation (OPC)

• Latched Protection (FB Pin)

♦ Over−Power/ Overload Protection

♦ Short−Circuit Protection

♦ Open−Loop Protection

• Externally Latch Triggering (RT Pin)

• Adjustable Over−Temperature Latched (RT Pin)

• VDD Pin & Output Voltage OVP (Latched)

• Internal Temperature Shutdown (140°C)

• This is a Pb−Free Device

Applications

• AC/DC NB Adapters

• Open−Frame SMPS

• Battery Charger