DRV8316: Regarding Abs of VM voltage ramp

Daisuke Higa

Genius 3475 points

Part Number: DRV8316

Hi support team.

My customer has asked to me regarding VM voltage ramp.

What is the risk if the absolute maximum rating (4V / us) of the VM's voltage ramp rate is exceeded?

Thanks and Best Regards,

Higa

over 1 year ago

0 Aaron Barrera over 1 year ago

TI__Mastermind 26046 points

Hi Higa-san,

We need to check with systems and design to see why this spec is implemented. We will get you a reply by the end of the week.

Thanks,
Aaron

0 Aaron Barrera over 1 year ago in reply to Aaron Barrera

TI__Mastermind 26046 points

Hi Higa-san,

There is an ESD diode from VCP-VM in the DRV8316. VM slew rates faster than 4 V/us can exceed the ESD rating and cause the ESD diode to damage and fail. This value is also spec'd from simulations so that design blocks do not behave unexpectedly (unintentional turn on of transistors), or else this can cause damage the device in some cases.

Thanks,
Aaron

0 Daisuke Higa over 1 year ago in reply to Aaron Barrera

Genius 3475 points

Hi Aaron-san

Thank you for answering.

My understanding is that the device is damaged by latch-up if VM ramp rate is exceeded, is correct?

Best Regards,

Higa

+1 Anthony Lodi over 1 year ago in reply to Daisuke Higa

TI__Mastermind 18450 points

Hi Higa-san,

If the VM ramp rate is exceeded there can be some current paths in the device that may begin to conduct, which can possibly lead to damage to the device. As long as the customer operates within the VM ramp rate specifications of the datasheet that should prevent any such issues.

Regards,

Anthony Lodi

0 Daisuke Higa over 1 year ago in reply to Anthony Lodi

Genius 3475 points

Hi Aaron-san

Thank you for your support.

I understand.

Best Regards,

Higa

0 Anthony Lodi over 1 year ago in reply to Daisuke Higa

TI__Mastermind 18450 points

Hi Higa-san,

Glad we could help!

Regards,

Anthony Lodi

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DRV8316: Regarding Abs of VM voltage ramp