FAN6921MR Fairchild Semiconductor, FAN6921MR Datasheet - Page 4

• Manufacturer Part Number: FAN6921MR
• Description: The highly integrated FAN6921MR combines Power Factor Correction (PFC) controller and Quasi-Resonant PWM controller
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN6921MR Rev. 1.0.2
Marking Information
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
CSPWM
RANGE
CSPFC
Name
COMP
INV
Description
RANGE pin’s impedance changes according to VIN pin voltage level. When the input voltage
detected by VIN pin is lower than a threshold voltage, it sets to high impedance; whereas it sets
to low impedance if input voltage is high level.
Output pin of the error amplifier. It is a transconductance type error amplifier for PFC output
voltage feedback. Proprietary multi-vector current is built-in to this amplifier. Therefore the
compensation for PFC voltage feedback loop allows a simple compensation circuit between this
pin and GND.
Inverting input of the error amplifier. This pin is used to receive PFC voltage level by a voltage
divider and provides PFC output over- and under-voltage protections.
Input to the PFC over-current protection comparator that provides cycle-by-cycle current limiting
protection. When the sensed voltage across the PFC current sensing resistor reaches the internal
threshold (0.82V typical), the PFC switch is turned off to activate cycle-by-cycle current limiting.
Input to the comparator of the PWM over-current protection and performs PWM current-mode
control with FB pin voltage. A resistor is used to sense the switching current of PWM switch and
the sensing voltage is applied to the CSPWM pin for the cycle-by-cycle current limit, current-
mode control, and high / low line over-power compensation according to DET pin source current
during PWM t
ON
time.
Figure 4. Pin Configuration
Figure 3. Marking Diagram
4
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