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DRV8873-Q1: Register Confirmation

Songzhen Guo
Intellectual 2840 points
Part Number: DRV8873-Q1

Hi Experts,

DRV8873-Q1 is mass production on customer side. Could you confirm the meaning of those register? Thanks.

For OCP, there only one parameter show the OCP, Iocp= 10A, and the Tocp= 5us. But I find there are 2 faults for one half bridge: OCP_H1 and OCP_L1, for those two faults bit, does it mean that:

OCP_H1: means the current on the high side FET bigger than 10A.

OCP_L1: mean the current on the low side FET bigger than 10A.

Itrip which mean the current limit threshold that wouldn't trigger the OCP, the Itrip can be configured by SPI, In my understanding, Itrip and Iocp are two different parameters. Is it right? 

I also want to know: Is there any relationship between Itrip and OCP_H1/OCP_L1? Thanks.

Best Regards

Songzhen Guo

  • +1
    TI__Mastermind 45445 points

    Hi Songzhen,

    OCP_H1: means the current on the high side FET bigger than 10A. Yes correct.

    OCP_L1: mean the current on the low side FET bigger than 10A. Yes this is correct. 

    But the above behavior is abnormal. Both H1 and L1 having OCP could suggest a device failure such as a shorted FET. Could you please describe the application in more detail? What is the load used? Is the customer using full-bridge or independent half-bridge configuration?

    Itrip which mean the current limit threshold that wouldn't trigger the OCP, the Itrip can be configured by SPI, In my understanding, Itrip and Iocp are two different parameters. Is it right? Yes these are two different entities. 

    I also want to know: Is there any relationship between Itrip and OCP_H1/OCP_L1? Itrip is used for current regulation. See page-18, section 7.3.1.4 Internal Current Sense and Current Regulation of the datasheet. Itrip must be set to < IOCP to avoid an OCP before current regulation. There is no relationship between Itrip and OCP_H1 and L1.

    Regards, Murugavel