FAN9611 Fairchild Semiconductor, FAN9611 Datasheet - Page 21

• Manufacturer Part Number: FAN9611
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN9611 / FAN9612 • Rev. 1.1.4
Gate Drive


Current Sensing

The gate drive pattern should be wide enough to
handle 1A peak current.
Keep the controller as close to the MOSFETs as
possible. This minimizes the length and the loop
area (series inductance) of the high-current gate
drive traces. The gate drive pattern should be as
short as possible to minimize interference.
Current sensing should be as short as possible.
21

Input Voltage Sensing (V


To minimize switching noise, current sensing
should not make a loop.
Since the impedance of voltage divider is large and
FAN9611/12 detects the peak of the line voltage,
the VIN pin can be sensitive to the switching noise.
The trace connected to this pin should not cross
traces with high di/dt to minimize the interference.
The noise bypass capacitor for V
connected as close to the pin as possible.
IN
)
IN
should be
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