FAN7385 Fairchild Semiconductor, FAN7385 Datasheet - Page 13

• Manufacturer Part Number: FAN7385
• Description: The FAN7385 is a monolithic IC designed for high voltage, high speed driving MOSFETs and IGBTs operating up to +600V
• Manufacturer: Fairchild Semiconductor

FAN7385 Rev. 1.0.2
© 2006 Fairchild Semiconductor Corporation
Typical Application Information
1. Under-Voltage Lockout (UVLO)
The FAN7385 has an under-voltage lockout (UVLO)
protection circuit to prevent malfunction when V
V
UVLO circuit monitors the bootstrap capacitor voltages
(V
2. Layout Consideration
For optimum performance, considerations must be given
during printed circuit board (PCB) layout.
2.1 Supply Capacitors
If the output stages are able to quickly turn on a switch-
ing device with a high current value, the supply capaci-
tors must be placed as close as possible to the device
pins (V
V
tance and resistance.
BS2
S
BS1,
for the floating supply) to minimize parasitic induc-
are lower than the specified threshold voltage. The
V
DD
BS2
and GND for the ground-tied supply, V
) independently.
BS1
B
and
and
13
2.2 Gate Drive Loop
Current loops behave like antennae, able to receive and
transmit noise. To reduce the noise coupling/emission
and improve the power switch turn-on and off perfor-
mances, gate drive loops must be reduced as much as
possible.
2.3 Ground Plane
To minimize noise coupling, avoid placing the ground
plane under or near the high-voltage floating side.
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