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TPS23755: Design review about TPS23755

Gary Teng
Genius 5190 points
Part Number: TPS23755

Hi Sir,

 My customer use TPS23755 in their IPCAM design. They finished their design and shipped products to end customer already. But There're high rate field returned from end customer in bus cam application. Would you please helping to check what they have to pay attention for their design. Thanks for your kindly help.

Failed condition: 

1. no 12V output

2. VB no 5V output, max 3V on failed devices.

3. no short found on pin 13/14/21/24

4. pin 21 (VCC) is 5.6V

5. If provide correct power on pin 6/21, D12V has correct output.

Best regards,

Gary Teng

  • 0
    TI__Mastermind 21320 points

    Hey Gary, 

    The customer does not have the required Vb diode in the schematic. This is in the datasheet and on the EVM. Please add this diode. Thank you!

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Genius 5190 points

    Hi Michael,

     Thanks for your response. We'll ask customer to add that.

     BTW, my customer measure VB pin impedance and see 28k ohm (OK device) and 24K (NG device). Is that means there's damage at internal regulator?

    Regards,

    Gary

  • +1 in reply to Gary Teng
    TI__Mastermind 21320 points

    Hey Gary, 

    We normally do not measure impedance of pins because the system will have a variety of paths to ground that change system to system. 

    Try applying power again to see if Vb is damaged.

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments