FAN6921ML Fairchild Semiconductor, FAN6921ML Datasheet - Page 4

• Manufacturer Part Number: FAN6921ML
• Description: The highly integrated FAN6921ML combines a Power Factor Correction (PFC) controller and a Quasi-Resonant PWM controller
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN6921ML • Rev. 1.0.2
Marking Information
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
RANGE
CSPFC
Name
COMP
INV
RANGE pin’s impedance changes according to VIN pin voltage level. When the input voltage
detected by the 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 the 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 (0.6 typical), the PFC switch is turned off to activate cycle-by-cycle current limiting.
Description
16
1
FAN6921FO
ZXYTT
TPM
Figure 4. Pin Configuration
Figure 3. Marking Diagram
Z
X
Y
TT
F
O
T
P
M
- Plant Code
- Frequency (M=Low, H=High Level)
- Package Type (N=DIP, M=SOP)
- Year Code (1 Digit for SOP, 2 Digits for DIP)
- Week Code (1 Digit for SOP, 2 Digits for DIP)
– Y=Green Package
- OLP Mode (L=Latch, R=Recovery)
- Fairchild Logo
- Manufacture Flow Code
– DIe-Run Code
4
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