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DRV8243H-Q1EVM: Full bridge driver Actuator control

Shinod kv
Prodigy 100 points
Part Number: DRV8243H-Q1EVM

Tool/software:

We're using the DRV8243HQRXYRQ1 in a full-bridge configuration to drive an actuator. We've set the overcurrent protection to its maximum limit, but the device is tripping at 6.5A, significantly lower than our required 10A and the datasheet's 12A rating. Could you help us understand why the overcurrent protection is activating at 6.5A, and what are the realistic maximum current limits we can expect under our operating conditions?.

Also we have configured as OCP disabled but still its tripping at 6.5A.

Full bridge configuration RIpropi = 1000Ohm 

Itrip resistor = 300KE

Thanks,

Shinod K V.

  • 0
    TI__Mastermind 23910 points

    Hi Shinod,

    1. Is this testing being done on a custom PCB or our DRV8243H-Q1RVM? 
    2. Can you provide the resistance used on the DIAG and MODE pins?
    3. Can a capture be provided of nFAULT, OUTx current, OUTx voltage, and the INx pin being PWMed?
    4. What is your systems expected peak and rms current?

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 100 points

    Hi Joshua,

    We are using our own designed board, find the attached file for your reference.

    Diag pin is 47K resister to gnd and Mode pin is open high impedance. some times I observed Ipropi pin goes to 5V but not every time.

    we have connected variable DC load if we reduce the load the driver IC started working fine. also conform me that the DRV8243 will support upto 12A in fullbridge mode ?. Actually our actuator working fine and we need to increase the current for UL certification rotor lock test.

      

     actuator_driver.pdf

  • 0 in reply to Shinod kv
    TI__Mastermind 23910 points

    Hi Shinod,

    Can a capture be provided of nFAULT, OUTx current, OUTx voltage, and the INx pin being PWMed? I would like to see the duration of the OUT current peak to see if there is a possibility that the device is experiencing a different fault.

    Shinod kv said:
    DRV8243 will support upto 12A in fullbridge mode ?

    Correct, this device can support up to 12A even in full bridge mode. 

    Regards,

    Joshua