FAN7529 Fairchild Semiconductor, FAN7529 Datasheet - Page 3

• Manufacturer Part Number: FAN7529
• Description: Critical Conduction Mode PFC Controller
• Manufacturer: Fairchild Semiconductor

FAN7529 Rev. 1.0.0
© 2006 Fairchild Semiconductor Corporation
Pin Assignments
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
COMP
MOT
GND
ZCD
OUT
V
INV
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 the output of the transconductance error amplifier. Components for output
voltage compensation should be connected between this pin and GND.
This pin is used to set the slope of the internal ramp. The voltage of this pin is main-
tained at 2.9V. If a resistor is connected between this pin and GND, current flows out of
the pin and the slope of the internal ramp is proportional to this current.
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 pin is the IC supply pin. IC current and MOSFET drive current are supplied using
this pin.
Figure 3. Pin Configuration (Top View)
V
INV
8
1
CC
F A N 7 5 2 9
COMP
OUT
7
2
3
Y W W
GND
MOT
6
3
Description
FAN7529 Rev. 00
ZCD
CS
5
4
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