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DRV8412EVM evalation

Atsushi Yamauchi
Genius 4810 points
Other Parts Discussed in Thread: DRV8412, DRV8834

I have a question of DRV8412 EVM/

Our customer want to check the unusual condition.

1. GVDD=12V, PVDD=5V

2. Ta=80deg.C

3. PWM_C=0V, PWM_D=3.3V, M1,2,3=Low

4. 1.1ohms between OUTC and OUTD intead of DC mortor

Is this condition severe? Is there the possibility of the crack of the package?  The Crack has occured with this condion in the customer evaluation.

Best regards,

Atsushi Yamauchi

 

 

  • 0
    TI__Guru 55605 points

    Yamauchi-san,

    My first concern is the test condition is a DC situation.  Since the device uses a bootstrap architecture to turn on the high-side FET, the output needs to cycle low to recharge this capacitor.  This is described in the datasheet. 

    Under the conditions you have listed, the 8412 would be continually be going into bootstrap under-voltage protection.  It is possible that a failure occured in the bootstrap circuitry under these conditions. 

    If the conditions above are the standard usage case, I would suggest looking for parts that can handle 100% duty cycle using an integrated charge pump.  We have a nice low voltage family of devices that operate off a single 5V rail. 

    For this application, I would suggest the DRV8834.  The outputs can be paralleled to handle 5A of current. 

    http://www.ti.com/product/drv8834

     

  • 0 in reply to Ryan Kehr
    Genius 4810 points

    Ryan-san,

    Thank you for your reply.

    This condition uses the extreme test only. Usally they do not use duty 100%.

    If they use this conditon, does over-current occur?

    Best regards,

    Atsushi Yamauchi