FAN7528 Просмотр технического описания (PDF) - Fairchild Semiconductor
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FAN7528 Datasheet PDF : 21 Pages
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Pin Assignments
VCC
OUT
GND
ZCD
8
7
6
5
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FAN7528
1
2
3
4
INV
COMP MOT
CS
FAN7528 Rev. 1.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
1
INV
2
COMP
3
MOT
4
CS
5
ZCD
6
GND
7
OUT
8
VCC
Description
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 at the high line condition and connected
to this pin. If this pin voltage is controlled to be lower than 0.45V, the device is
disabled.
This pin is the output of the transconductance error amplifier. Some components for
the 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
maintained to be 1V. 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 sensitive to the
negative voltage below -0.3V. For proper operation, the stray inductance in the sensing
path and the inductance of the sensing resistor must be minimized.
This pin is the input of the zero current detection block. If the voltage of this pin goes
higher than 1.5V, then 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 level is
400mA. 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.
© 2005 Fairchild Semiconductor Corporation
FAN7528 Rev. 1.0.6
3
www.fairchildsemi.com
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