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DRV8832: 10V overshoot

Genius 17290 points

Replies: 2

Views: 129

hi,

we are using DRV8832 and observe 10V overshoots when the VSET (coming from an external DAC) changes quickly over time.

Supply is 5V.

We have a SW patch to change it slowly, but I wanted to ask if there is a workaround (I dread no, as should be the back-EMF of the brushed motor).

Unfortunately I have no scopeplot to confirm it is not RF coupled noise (the 10V overshoot should have destroyed the part).

Fact is that it is observed when VSET quickly change.

Any advice (in the meantime I will try to gather some scopeplot)?

thanks a lot in advance

KR

Vincenzo

  • Vincenzo,

    According to Functional Block Diagram, the output duty cycle is also quickly changed When the VSET is quickly changed. That can quickly transfer the output energy back to input terminal. So, you have to add a ZVT diode clamp the input voltage or slowly change VSET.

    Best Regards,

    Wang Li

    Motor Drive Solutions

  • In reply to Wang5577:

    Vincenzo,

    According to the schematic, the output energy won't quickly transfer back to the input terminal after adding RC filter on VSET pin to slow down the VSET falling edge. The VSET pin RC filter can avoid VSET quickly drop and the input terminal voltage overshoot.

    Best Regards,

    Wang Li

    Motor Drive Solutions

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