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TPS65400: Current Sharing : SW1/SW2 & SW3/SW4 Enable controls

RAHUL SHARMA52
Intellectual 715 points
Part Number: TPS65400

Hi, 

We are using TPS65400 in our design. Following are the specification.

1. Current Sharing B/W SW1 & SW2


Vin = 12V (Typ)

Vout = 1.8V (Typ) @ 6A Current Max

Enable pins of SW1 & SW2 are tied together & connected with the Microcontroller for the sequencing.

Similar way,

2. Current Sharing B/W SW3 & SW4


Vin = 12V (Typ)

Vout = 0.85V (Typ) @ 3.5A Current Max

Enable pins of SW3 & SW4 are tied together & connected with the Microcontroller for the sequencing.

Our requirement is to control the Vout 1 (1.8V) & Vout 2 (0.85V) using the Enables pins. Typical application is shown below.

In the TPS65400 page no 29, Sec 8.4.3, it is written that

"When SW1/SW2 pair output and/or SW3/SW4 pair output are shared, the responding pairs current sharing mode is enabled and the ENABLE_PIN_CONFIG is set to single ENABLE".

but we would like to control enable of each sharing pair using MCU. If a see default value of  register ENABLE_PIN_CONFI G, the value if active enable that means we can control individual enables.

We do not want to use PMBus by as default hardware configuration. 

Please clarify is our application approach is correct. Can we control enable of each pair using MCU?

Regards:

Rahul Sharma 

  • 0
    TI__Mastermind 19080 points

    Hi Rahul,

    Yes, you can control each pair by its own ENx pin.

    To achieve this, please set bits [1:0] in PIN_CONFIG_00 register to "00". This will active the ENx pin control for each channel. And, as you are doing current sharing, SW2 and SW4 are slave channels. So EN2 and EN4 will not take effect. EN1 and EN3 will control the on/off of each pair, respectively.

    Any further question, please let us know. Thanks!

    Regards,

    Hao

  • 0 in reply to Sam(MPAA) Zhang
    Intellectual 715 points
    Hi,

    Thanks for quick response!

    Need more clarity.

    Is it necessary to program bits [1:0] in PIN_CONFIG_00 register to "00"? I believe the default value of the same register is "00" only mentioned at Table 21 in the datasheet.
    We would like our hardware to bring-up by default without using the PmBus initially. We just want to control Enable pins ENSW1 & ENSW3.

    Thanks.

    Rahul
  • 0 in reply to RAHUL SHARMA52
    TI__Mastermind 19080 points
    Hi Rahul,

    No, there is no need to program it. Just leave it as default.

    Regards,
    Hao