• Resolved

DRV8323: DRV8232S amplifier output issue

Intellectual 1165 points

Replies: 7

Views: 122

Part Number: DRV8323

Hi team,

My customer is using DRV8232S for their design and have this amplifier output issue. No output for the amplifier, only have the bias voltage of 1.65V.

Could you please help to check if anything goes wrong? Thanks.

This is working on open-loop condition:

Yellow:Amplifier input voltage, about +-50mV,  test on shunt resistor

Blue: SOA output. Keep flat on 1.65V.

Green: Motor phase current.

  • James,

    Thanks for posting on the MD forum!

    We would need to review the schematic and layout to check for any issues.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Hi Adam,

    I've sent you the files through email because customer didn't want to post in on internet.

    Thanks.

    James

  • In reply to James Zhan:

    James,

    Thanks for the files. I don't see any obvious issues in your files. 

    Can you confirm the following:

    1. Is VREF powered up and what voltage do you see at DRV pin 24?
    2. If you measure both pins of C18, do you see a differential voltage?
    3.  What is the state of the CAL pin?
    4. What is the read back contents of register 0x06?

    The CSA operation is very simple, as long as the VREF is powered, the CAL pin is LOW, and there is an input signal, the output should work fine.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Hi Adam,

    Please check the comments as below:

    1. Is VREF powered up and what voltage do you see at DRV pin 24

      Yes, and it's 3.3V.

    2. If you measure both pins of C18, do you see a differential voltage?

      Yes, I could see a sine waveform around  +-50mV as below picture in yellow color.

    3.  What is the state of the CAL pin?

      I haven't checked this pin yet. What should it behave?

    4. What is the read back contents of register 0x06?

                I don't have SPI communication right now, only using the default setting of the DRV8323S.

  • In reply to James Zhan:

    Adam, 

    After checked the customer's board, the CAL is controlled by MCU and always high. So we get the result. 

    After changing the CAL to low, problem solved.

    Hawken

  • In reply to Hawken Li:

    Hawken,

    Glad to hear this was resolved.

    Could you please click the green "This resolved my issue" button? It would really help us a lot.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Hi Adam,

    Thanks for your help.

    I've clicked the green button.

    James