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TPS65400: EN Questions

Richard Elmquist
Mastermind 45250 points
Part Number: TPS65400

My customer is asking the following questions regarding the TPS65400 EN pins:

The data sheet indicates all ENSWx pins are ignored when the ENABLE_PIN_CONFIG field is set to 01 (Sec 8.6.2.3). However, Figure 31 does not indicate this -- because of the AND gates, the ENABLE pin must be high in order for the output to be ON according to the diagram. This is the behavior I find on the TPS65400 eval board. I cannot get the outputs to turn when the ENSWx pin is pulled low, even when ENABLE_PIN_CONFIG = 01 (inactive enable). Is this feature supported on the chip? Are there additional register settings that must be made?

The customer seems to be correct if you look at figure 31. Can you explain this?

Thanks for your help with this issue!

Richard Elmquist

  • 0
    TI__Genius 15135 points
    Hi, Richard

    I have checked on EVM.
    When set ENABLE_PIN_CONFIG=inactive(01), and connect ENSW1~4 pin to GND, then power up, all of 4 bucks are normal working. It looks ENSW1~4 pin voltage is ignored.

    I suspect it is caused by chip version, could you tell me the marker on TPS65400 chip?
    I used the B4 version.
  • 0 in reply to Zhao Ma
    TI__Mastermind 45250 points

    Zhoa,

    Thanks for your response!

    I looked and the top-side marking does not normally have a B4 in it. Where can the customer look for this. Is this just the data code?

    I will let you know if the customer has any further questions.

    Thanks for your help.

    Richard Elmquist

  • 0 in reply to Richard Elmquist
    TI__Genius 15135 points

    Hi, Richard

    See the B4 maker as below.

    I remember the B3 version has some issues, but not sure it is this issue.

    So please confirm the version firstly, and then check the setup.  

     

  • 0 in reply to Zhao Ma
    TI__Mastermind 45250 points

    Zhao,

    Here is a picture of the chip on his board.

    This looks to be different form the chip on your board.

    Should he replace the chip?

    Let me know what the customer should do.

    Thanks for your help with this!

    Rochard Elmquist

  • 0 in reply to Richard Elmquist
    TI__Mastermind 45250 points

    Zhao,

    For some reason the picture did not load. Here it is again.

    Thanks for your help with this!

    Richard Elmquist

  • 0 in reply to Richard Elmquist
    TI__Mastermind 18510 points
    Hi Richard,

    Zhao is on vacation for Chniese Dragon Boat Festival, I just helped to check the version B, it is same as Verision B4, so they should have the same behavior.
    As zhao's EVM testing before, when ENABLE_PIN_CONFIG=inactive(01) and ENSW1~4 pin are tied to GND, all bucks can work normally, which indicates that ENSWx are ignored aftere ENABLE_PIN_CONFIG is set 01(inactive), so the function should be OK. I guess it should be related to the configuration.
    I suggest to double check below functions.
    1, set ENABLE_PIN_CONFIG=01, set ENSW1/2 high and ENSW3/4 tired to GND, check if Vbuck1~4 is right?
    2, set ENABLE_PIN_CONFIG=00, set ENSW1/2 high and ENSW3/4 tired to GND, check if Vbuck1~4 is right?
    and BTW, Looks Fig31 is the function with active ENable selected, not inactive. and when you set registor, make sure the value is stored in the chip by clicking " store_default_all" button.

    Regards,
    Yuchang
  • 0 in reply to Yuchang Zhang
    TI__Mastermind 45250 points

    Yuchang,

    Thanks so much for your response!

    I will reply back if the customer has any further questions.

    Thanks again!

    Richard Elmquist