I understand the usage of zener diode to limit Vgs, and the usage of R to prevent unwanted switch-on when gate is floating (Am I correct in the understanding?). Here are my questions.
- why are zener and R used together as the 3rd picture shows? Are those different config related with inverter power ratings?
- what's the difference between using zener diode and TVS diode as in 4th picture?
- How to choose zener diode in term of breakdown voltage Vc? Vc higher than Vth but lower than Vgsmax?
One more question, is it common to use zener and R in parallel between gate and source to both limit Vgs and avoid unwanted switch-on?