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TPS53679: About VIN_CSNIN pin and CSPIN pin and V3P3 pin

Sho Ogane
Genius 5575 points
Part Number: TPS53679

Hi all.

I have three questions about TPS53679.

1. Is V3P3 pin input?
 At datasheet, this pin is  listed output.
 I think this pin is input pin.

2. My customer doesn't use voltage and current and power sensing.
    If we don't use VIN_CSNIN and CSPIN, can we open its? 

3.Can we write to  input pin commands be default values?
   Do the input pins have a specified command?

Best Regards,
Sho

  • 0
    TI__Expert 4060 points

    Hi Sho,

    Happy to help out.

    1) Correct, the V3P3 pin in an input pin for the 3.3V supply to power the controller IC. I'll pass this along to the product line so they can correct it in the next datasheet revision.

    2) If you aren't using the input current sense feature both CSPIN and VIN_CSNIN should be shorted together and connected to the 12V rail per the pin description table on pages 5 and 6.

    3) You can use the PMBus and NVM features of the IC to set up things such as the initial boot voltage, over-current limit, phase add/drop points, etc. so that they are configured upon startup. That would need to be programmed at some point during the PCB assembly process though there may be an option to order parts with the initial programming done already. I would have to look into that though and get back to you if that's what you are asking.

    If I can help out any more please let me know.

    Thanks,

    Carmen

  • 0 in reply to Carmen Parisi
    Genius 5575 points

    Hi Carmen,

    Thank you for your support, and sorry for my late reply.

    I have one more question about the your answer of Q2.
    >2) If you aren't using the input current sense feature both CSPIN and VIN_CSNIN should be shorted together and connected to the 12V rail per the pin description >table on pages 5 and 6.

    Can we short the CSPIN and VIN_CSNIN to GND if we don't use the both pins?

    Best Regards,
    Sho

  • 0 in reply to Sho Ogane
    TI__Expert 4060 points

    Hi Sho,

    CSPIN and VIN_CSNIN have to go to VIN when they aren't being used. The D-CAP+ modulator still needs to sense VIN in order to properly regulate VOUT. Without that connection line transient response, stability, and DC regulation could all be affected and you won't get the optimal performance out of your design.

    Thanks,

    Carmen