DRV8835: Overcurrent Period Specification

Colin Campbell1

Other Parts Discussed in Thread: DRV8835

Hi TI,

The DRV8835 Data Sheet (see segment of page 5 below) defines an Output Overcurrent Deglitch period (Tdeg) of 1us, but is silent on the actual Overcurrent Period (e.g. 100us) prior to the MOSFET Gate drive being turned off under this fault condition. My interpretation of the Data Sheet at this stage is that if an Overcurrent condition >= Iocp exists for the Deglitch period (Tdeg), the MOSFET drive is turned off - is this correct or is there a separate Overcurrent Period? Thank you for the assistance and clarification.

Best regards - Colin Campbell

over 8 years ago

0 Wilson Zuo over 8 years ago

TI__Mastermind 26065 points

Hi Colin,

Yes. If the real OCP condition > tDEG (1us), the device is in OCP protection and turns off the output for 1ms (tOCP) and retrys the outputs. Then if the OCP event is still there, the ouputs will only turn on for another tDEG (1us) time then OFF again for tOCP time. If the OCP condition <tDEG and not presented any more, there will be no OCP action.

Best regards,

0 Colin Campbell1 over 8 years ago in reply to Wilson Zuo

Prodigy 40 points

Hi Wilson,

Many thanks for the prompt confirmation of the overcurrent behavior of the DRV8835!

Best regards,
Colin Campbell

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DRV8835: Overcurrent Period Specification