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LM25066A: LM25066A PMBus Operation

Shinu.V.Mathew
Genius 10630 points
Part Number: LM25066A

Hello Team,

One of our customer is using LM25066A and having below queries regarding the PMBus command and operation, can you plase help with your commends on the same.

1) Does LM25066A support shutting down the output through PM Bus ? Once the shutdown command is issued, can the controller to switch the output back on after a time out.

2) Only the shutdown command will be issued thro’ the PM Bus. Can the turning ON can happen autonomously after a wait-off period (timeout) without any PM Bus command. What will be the off duration time is the time need to be configured? 

Thanks in advance for your help and support.

Regards, Shinu Mathew.

  • 0
    TI__Expert 5940 points

    Shinu,

    Operation Command (01h) turns on / off the LM25066A when written to.  Timing between off and on is controlled by the system, no timeout by the device itself.  UVLO can be used to turn off via a signal input.  Timing to turn on again after UVLO rises to 1.16v would be done via a transistor with RC charge, assuming the UVLO was pulsed to begin with.

    Brian

  • 0 in reply to Brian Daugherty
    TI__Genius 10630 points

    Hi Brian,

    Thanks for the clarification.

    1) This essentially means that the hot swap controller can be commanded to turn the output off thro' PM Bus. The Hotswap Controller will turn the output back on after a timeout, with no trigger from the PM Bus. Please confirm.

    2) "Timing between off and on is controlled by the system, no timeout by the device itself.  "

    Please elaborate more on this point.

    Regards, Shinu Mathew

  • 0 in reply to Shinu.V.Mathew
    TI__Expert 5940 points
    Shinu,

    You will have to turn it back on with PMBus. Operation command is like a switch via PMBus. you turn it on and off witht he command. If you want a timeout, you will need to do this with the UVLO pin using a transistor, pulsed signal into an RC on the gate or otherwise control the timing.

    Brian