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DRV8428PEVM: pwm driver AIN1/AOUT1 is not working

Pierre Perraud
Prodigy 10 points
Part Number: DRV8428PEVM
Other Parts Discussed in Thread: DRV8428E, DRV8428

Hello,

I made a new design with a DRV8428PPWR pwm motor driver.

All is working fine, except one subdriver. Despite what I put on the AIN1 input, AOUT1 is always tied to GND. (but there no shortcut between GND and AOUT when it's not power supplied, so it must be the pulling mosfet inside the driver that is in saturation).

I tried several components and made a lot of test but I can't find out the issue. The design is very simple :

I checked several times the pinout compare to the datasheet and it looks ok. I'm sure that I have a DRV8428P reference and not a DRV8428E.

AIN1 is connected on pin 15 and AOUT1 on pin 3.

Thanks for your help,

Pierre

  • 0
    TI__Mastermind 37683 points

    Hi Pierre,

    What device are you using? DRV8428P or DRV8428E? The schematic symbol is not correct. The DRV8428P is the PWM variant which uses AIN1, AIN2, BIN1, BIN2 for the control signals and follow a different control logic. Can you check what is the marking on the top of the IC that's on your board. Is it the P or E version?

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    Prodigy 10 points

    Hi Pablo,

    Thanks for your answer !

    I can confirm that I use a 8428P,  I can see it on the top of the package. I know that the symbol is one from the 8428E, but I compared the pinout in the datasheet, and everything looks the same, just the 4 control input pins have a different name, but they are at the same place.

    Please don't hesitate if you have another idea Slight smile

    Thank you,

    Pierre

  • 0
    Prodigy 10 points

    Ok, the issue was the nSLEEP pin that was tied to 24V, it disabled the AIN1 which is close to it.

    Its better with 3.3V on nSLEEP...