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What attention should be paid to rising and falling time of the driving signal for MOSFET?

Please shorten the rising and falling time of the driving signal of the MOSFET gate as much as possible.
As for the operation of the MOSFET, the switching time varies depending on the gate resistor value.
When using lower gate resistance, switching time becomes shorter, and ringing (damped oscillation) may occur.
Ringing can cause oscillation and EMI noise.
When using higher gate resistance, switching time becomes longer.
As a result, switching loss increases and heat is generated.
In the bridge circuit, a short circuit may occur across the upper and lower MOSFETs by combination of the gate resistances.
Therefore, it is necessary to consider the optimum gate resistance.


For MOSFET’s switching, please refer to “MOSFET Gate Drive Circuit:Power MOSFET Application Notes.”

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