00:00What are the functions of the pull-down resistor at the MOSFET gate?
00:06Welcome to YB's Science Corner
00:09The MOSFET has extremely high input impedance, making it susceptible to internal and external interference.
00:17The pull-down resistor R provides a fixed voltage level, enhancing its immunity to interference.
00:24Sudden power loss or other issues may cause the driver circuit to malfunction, resulting in residual charge.
00:33Trapped in the MOSFET's junction capacitance, the pull-down resistor R serves as a discharge path for this charge.
00:41Due to capacitor C1, static charges have no path to discharge, causing voltage spikes that can easily break down the MOSFET, adding pull-down resistor R.
00:54Provides a discharge pathway for charge Q, preventing electrostatic breakdown.
00:59Due to the influence of capacitance C1 and inductance, overshoot ringing or resonance may occur, adding pull-down resistor R, equates to connecting a damping resistor.
01:12In parallel within the resonance circuit, it dissipates resonant energy, thereby suppressing the amplitude and duration of ringing.
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