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gate driver circuit for mosfet

dark night

Nov 14, 2012
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Nov 14, 2012
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hi,
I've designed a boost converter with a 30V input. It is running at 60% duty cycle.

for pwm circuit i have been used pic to generate a pwm.



so my question is (as shown in the circuit) hows the pwm inverted (after gate drive)

any help to understand the operation of the gate drive?
 

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Harald Kapp

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Nov 17, 2011
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PWM=0V:
Q1 is off
R5 biases Q2 = on, Q3 = off

PWM=3.3V:
Q1 is on
Q2 is off, Q3 is on.

That's not too difficult, is it?

Harald
 

BobK

Jan 5, 2010
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It is bypassing the gate resitor during the turn off phase to make it turn off faster.

Bob
 
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