BOOSTXL-DRV8323RH: Protect MOS form burn when short test

yx yan

Intellectual 275 points

Part Number: BOOSTXL-DRV8323RH

Tool/software:

I want to know how to protect my mosfet below these situation:

1 - When my motor is running,SHA short to GND

2 - When my motor is running,SHA short to SHB.

I tested these two situation,my mosfet burned.

2 months ago

0 Joel A. Adejola 2 months ago

TI__Prodigy 335 points

Hi Yx Yan,

Thank you for your question! I will review your query and aim to get back to you by the end of the week.

Regards,

Joel A. Adejola

0 Joel A. Adejola 2 months ago

TI__Prodigy 335 points

Hello Yx Yan,

Thank you for your patience. The Vds monitors help shutdown the FETs in these instances - depending on what you've set your Vds trip threshold at. Could you share that value with me?

Cheers,

Joel A. Adejola

0 yx yan 2 months ago in reply to Joel A. Adejola

Intellectual 275 points

our schematic as below

0 Anthony Lodi 2 months ago in reply to yx yan

TI__Mastermind 26506 points

Thank you for the schematic! We will aim to provide a response this week.

Regards,

Anthony Lodi

0 Joel A. Adejola 2 months ago

TI__Prodigy 335 points

Hello Yan,

From the schematic, it looks like your VDs Trip Threshold (VDS_OCP) is set at 1.13-V. What is your motor current?

If the product of this current and the Rds(on)-max for your FET (link to datasheet) is less than your trip threshold (1.13-V), then overcurrent protection will not kick in.

Cheers,

Joel A. Adejola

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BOOSTXL-DRV8323RH: Protect MOS form burn when short test