• TI Thinks Resolved

SNBB028N OCP

Expert 1765 points

Replies: 6

Views: 112

Hi all

I have a question on the SNBB028N motor driver.
SNBB028N is TI's Motor driver for Japanese customers.

Does OCP detect all FETs?
Or is it only detecting the high-side FET?

Best Regards,
Ishiwata

  • Hi Ishiwata-san,

    All of the standard DRV88xx devices with integrated FETs detect OCP in all FETs. I expect the SNBB028N to also detect OCP in all FETs, but will confirm.

    We are currently out of the office, but will reply by Tuesday.

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi Rick-san

    Thank you for your great support.
    I am waiting for your reply.

    Best Regards,
    Ishiwata

  • In reply to Shuji Ishiwata:

    Hi Ishiwata-san,

    As mentioned, all of the standard DRV88xx devices with integrated FETs detect OCP in all FETs.

    We have not been able to locate the information to confirm, but are confident the SNBB028N detect OCP in all FETs.

    Have you seen some behavior that is unexpected?

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:


    Hi Rick-san

    Thank you for your reply.
    In the customer's circuit diagram, the solenoid coil is connected only to xOUT2. xOUT is not connected.


    The customer wants to know the content of the caution in the circuit.
    I thought OCP would not work. So I asked Rick-san.

    Best Regards,
    Ishiwata

  • In reply to Shuji Ishiwata:

    Hi Ishiwata-san,

    The OCP circuit is designed to measure the current through each FET individual. If a short to 12V occurs at the BOUT2 pin when the low side FET is enabled, the overcurrent circuit is activated.

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi Rick-san

    Thank you for your answer. And for great support.
    I understand that OCP works and there are no connectivity issues.

    Best Regards,
    Ishiwata