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TPS74401: Remote Sensing

Hirotsugu Kobayashi
Mastermind 9540 points
Part Number: TPS74401

Hi, team.

It will oscillate when sensing from the A point attached with TPS744.
It does not oscillate when sensing from point B or point C.
I want to remotely sense from point A because the IR drop is large.

Since an IC cannot be placed between the connector and the load, I think that it will not oscillate if the LDO has a slow response.

Are there 3A and 1A LDOs that support remote sensing and have a slow response speed?

  • 0
    TI__Mastermind 23361 points

    Hi Kobayashi-san, 

    To better assist you, will you be able to share your complete schematic with the LDOs?

    Regards, 
    Jason Song

  • 0 in reply to Jason Song
    TI__Mastermind 37065 points

    Hi Kobayashi-san,

    As Jason stated, we can better assist if we knew the LDO schematic and the manufacturing part numbers of the pi filter.
    We could also use the load current value after the pi filter.  Are there load transients?
    If so, do you happen to know any of the details (rise time, magnitude, load pulse duration)? 

    Is the stability an issue across temperature, or does it only happen at a range of temperatures?

    Can you give us the frequency of oscillation and amplitude of oscillation?  Is the oscillation sinusoidal or a different shape?  A scope shot would be better if you have that.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 37065 points

    Hi Kobayashi-san,

    It has been 2 weeks, so I am assuming that you have resolved your issue.

    Please let us know if you need any further assistance.

    Thanks,

    - Stephen