What are the D24 and R106 of this half-bridge driver circuit used for?

天天1

What are the D24 and R106 of this half-bridge driver circuit used for? [Copy link]

Attached is the circuit diagram

天天1

These two reserved parts are supposed to enhance the reliability of the circuit. How do they enhance the reliability of the circuit?

lingfengwuji

R106 pulls down to prevent the lower MOS gate from floating. D24 turns off the upper MOS quickly to ensure that the two MOS have dead time.

wenyangzeng

D24 promotes faster cutoff of Q4.

topwon

D24 allows the upper MOS to turn off quickly, and D24 promotes faster cutoff of Q4. The principle is to provide a low-resistance discharge channel for the gate charge of the MOS tube (short-circuit R101 during discharge to reduce the R value in the discharge loop), so that the cutoff speed of the MOS tube can be accelerated (the RC constant is reduced and the discharge time is shortened).

dwwzl

lingfengwuji posted on 2018-8-22 22:46 R106 pulls down to prevent the lower MOS gate from floating. D24 allows the upper MOS to turn off quickly, ensuring that the two MOS tubes have dead time

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