DRV3205-Q1: Can I remove gate resistor of DRV3205-Q1?

Soichi Nishimura

Expert 4465 points

Part Number: DRV3205-Q1

Hi team,

I have questions to DRV3205-Q1.

Can the gate resistor of MOSFET be removed? Or, should gate resistor use for DRV3205-Q1?

Regards,

Nishimura

over 2 years ago

0 Adam Sidelsky over 2 years ago

TI__Guru 61360 points

Nishimura-San,

This depends heavily on the FET used, the gate drive current, the PWM switching frequency, and the output VDS rise and fall time needed.

If the customer can give us this info then we can help decide if gate resistance is needed.

Regards,

-Adam

0 Soichi Nishimura over 2 years ago in reply to Adam Sidelsky

TI__Expert 4465 points

Hi Adam,

Thank you for your answer. Customer wants to check the Rgate necessity by design point of view.

Customer will evaluate the DRV3205-Q1 without Rgate on their application. In this case, if customer checks the DRV3205-Q1 doesn't need Rgate and it seems there is no issue, customer can use DRV3205-Q1 without Rgate? Or, for design reason of DRV3205-Q1, is it needs to use Rgate?

Regards,

Nishimura

+1 Adam Sidelsky over 2 years ago in reply to Soichi Nishimura

TI__Guru 61360 points

Nishimura-San,

If the customer is using more than one FET per gate output, then gate resistors are needed. This app note discusses the same topic for another similar driver: https://www.ti.com/lit/an/slvaf39a/slvaf39a.pdf?ts=1623094793659&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDRV3255-Q1%253FkeyMatch%253DDRV3255%2526tisearch%253Dsearch-everything

If the customer is using only one FET per gate and the IDRIVE setting selected does not cause overshoot/undershoot/ringing on the gate or source lines then they do not need a gate resistor.

Regards,

-Adam