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| FAN7387 Datasheet, PDF (14/17 Pages) Fairchild Semiconductor – Self-Oscillated, High-Voltage Gate Driver | |||
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+14V
External
Signal
RCT 1
VDD 2
RDT
DT/SD
3
Cbp
GND 4
VB
8
HO
7
6 VS
LO
5
Rev. 1.0
Figure 32. External Shutdown Circuit
4. Gate Driver Operation
The FAN7387 has a two operating modes. One is the
self-oscillation mode by using external timing resistor
(RT) and external timing capacitor (CT) and the other is
the forced oscillation mode by external PWM signal
comes from U-com and the other devices.
Figure 33 shows how to operate IC by using external
PWM circuit with additional resistors (R1 and R2)
because of internal limitation of IC. The input signal
range from an external circuit must by within 3/5 VDD and
3/4 VDD. The external signal produce the HO and LO
output and HO signal is to in-phase with the external
input signal.
VDD
R1
R2
PWM
GND
RCT 1
VDD 2
RDT
DT/SD 3
C
GND 4
8 VB
7 HO
6 VS
5 LO
FAN7387 Rev1.0
Figure 33. Gate Driver Using External PWM Signal
© 2008 Fairchild Semiconductor Corporation
FAN7387 Rev. 1.0.0
14
www.fairchildsemi.com
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