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L293- shorting output to gnd burns the chip

Milos Stankovic
Prodigy 60 points
Other Parts Discussed in Thread: L293, DRV8841, DRV8843, DRV8844, DRV8812, DRV8813

Dear Madam or Sir,

I use L293 as an buffer and level shifter from 5VDC to 24VDC on two of our boards and it works perfectly except for one thing: shorting any of the outputs to ground kills the chip! Could you suggest me a solution to this problem? I suppose there is a protection circuit that has to be added on the board to protect the output. If there is a device with similar function and shortcut protection embedded in chip, it can also be a solution to the problem.

Regards,

Milos Stankovic

  • 0
    TI__Mastermind 26065 points

    Hi Milos

    You come to the right place. All DRV88xx drivces will give you good short protection no matter you short the output to GND, VM or cross each other.

    DRV8841, DRV8843 or DRV8844 will be a matching one. You can check those datasheet in detail. Also, if your inputs can be a phase/enable way, lots of option there, such as DRV8812, DRV8813. I put the bold font for your first choice.

    As only a level shift, you can use without current regulation function, just connect ISENx pins to GND. And the OCP or short protection function will still be valid.

    Thanks

    Wilson Zuo

    Motor Application Team