FAN7930 Fairchild Semiconductor, FAN7930 Datasheet - Page 3

• Manufacturer Part Number: FAN7930
• Description: Critical Conduction Mode PFC Controller
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN7930 • Rev. 1.0.1
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name Description
COMP
GND
RDY
ZCD
OUT
INV
V
CS
CC
This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter
should be resistively divided to 2.5V.
This pin is used to detect PFC output voltage reaching a pre-determined value. When output
voltage reaches 89% of rated output voltage, this pin is pulled HIGH, which is an (open drain)
output type.
This pin is the output of the transconductance error amplifier. Components for the output voltage
compensation should be connected between this pin and GND.
This pin is the input of the over-current protection comparator. The MOSFET current is sensed
using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is
included to filter switching noise.
This pin is the input of the zero-current detection block. If the voltage of this pin goes higher than
1.5V, then goes lower than 1.4V, the MOSFET is turned on.
This pin is used for the ground potential of all the pins. For proper operation, the signal ground
and the power ground should be separated.
This pin is the gate drive output. The peak sourcing and sinking current levels are +500mA and -
800mA, respectively. For proper operation, the stray inductance in the gate driving path must be
minimized.
This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
Figure 3.
Pin Configuration (Top View)
3
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