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TPS40428: TPS40428 factory default setting

Allen1
Prodigy 120 points
Part Number: TPS40428

Hello,

I have someting about TPS40428 PMBUS factory default setting, can you help me about this?

Below is my design specification:

1>Vin:12V; 2>Vout: 0.85V; 3>Iout: 45A

I choose a single TPS40428 and 2-phase output for this application.

Does this application can power on normally with TPS40428 PMBUS factory default setting? Do we need to modify any  parameters for this design?

  • 0
    TI__Expert 5965 points

    Hi,

    Vout can be set with resistor divider in feedback path, 2-ph should be able to support 45A with no problem. So this application should be able to power up with PMBus factory default setting.

    Regards,

    Weidong

  • 0 in reply to Weidong Zhu
    Prodigy 120 points

    Hi Weidong,

    Thanks for your information.

    The design should be OK, what I concerned is the default PMBUS factory setting for the 2-phase application.

    In TPS40428 datasheet page 63, E6h register is  default setting to 0000h. And the last two bites are used for phase setting.

    But my design is 2-phase application, so the E6h register should be changed to 0001h, right? What will happen if use the default setting?

    Could you help check if any other default register setting need to change for this 2-phase application? 

    Thanks.

  • 0 in reply to Allen1
    TI__Expert 5965 points
    Hi,

    You will not need to change E6 register setting for 2-phase operation. As long as the connection is 2-phase (refer to Fig 19 in datasheet), it will operate as 2-phase. Register is used for 2 IC settings.

    Regards,
    Weidong
  • 0 in reply to Weidong Zhu
    Prodigy 120 points

    Got it, the default PMBUS factory setting should be OK for the one single output 2-phase application.

    Thanks a lot for your help.