DRV8312: Overcurrent protection

Cherry Zhou

Part Number: DRV8312

Hi Team,

The customer would like to know if the overcurrent of this chip can be set to a smaller value, such as over 200k? Also, it requires that the bus for this current sensing be phase currents. Thanks.

Best Regards,

Cherry

over 1 year ago

0 Joshua Maize over 1 year ago

TI__Genius 12231 points

Hi Cherry,

The DRV8312 max OCP resistance is capped at 200k and should not be exceeded. There is also the consideration that there is a possible 20% variation on OCP performance between devices, which may further affect an abs-max violating selection.

Is there a particular OCP threshold that is desired? A different device may be more suitable for the application.

Best Regards,

-Joshua

0 Cherry Zhou over 1 year ago in reply to Joshua Maize

TI__Mastermind 22235 points

Hi Joshua,

Thank you for the support.

May I know is the current being captured phase current or bus current?

Thanks and regards,

Cherry

0 Joshua Maize over 1 year ago in reply to Cherry Zhou

TI__Genius 12231 points

Hi Cherry,

The current monitored is the BUS-current flowing from battery to GND, as an OCP condition usually occurs when both high-side and low-side MOSFETs are conducting ("cross conduction").

Best Regards,

-Joshua

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DRV8312: Overcurrent protection