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preventing the LDO from burning

or sam
Expert 2020 points
Other Parts Discussed in Thread: LP5907

Hi

I have a part of my circuit that use 2.8V for this I am planing to use LP5907. the problem is that it takes the part of circuit that provides the voltage to the LDO input some time until the voltage stabilize around 3V. it can even get to 15V before stabilizing on 3V.

is there a solution that can be applied here so I wont burn the LDO?

maybe some kind of switch that closes under certain voltage or something like that?

what is the name of such component so I will look for it in the site?

Regards,

 

  • 0
    TI__Expert 8905 points

    A properly sized TVS diode should be able to clamp the input voltage from ringing above the abs. max on the device.

    A 15V peak seems really high with a 3V steady-state condition - is this operation expected with your design?

    Regards,

    David

  • 0 in reply to David Hopkins
    Expert 2020 points

    Hi

    thanks for your answer.

    what is the difference between this tvs diod to ESD?

    if I uses ESD and I want it to block everything above 6V then do I need to choose ESD with clamp voltage 6V is this the parameter that is important.

    thanks in advanced,

     

  • 0 in reply to or sam
    TI__Expert 8905 points

    An ESD diode is designed to provide protection from a very fast transient that has a short duration, but quite a bit of energy due to its short duration.

    More on ESD protection diodes:

    http://www.ti.com/lit/an/ssya010a/ssya010a.pdf

    A TVS diode is meant to handle longer transients than an ESD diode. The below application note explains in more detail:

    http://www.ti.com/lit/an/slla292a/slla292a.pdf

    An ESD diode could very easily be damaged by using it to block the ringing, and would not be advised. I would suggest first adding a large capacitance on the output of your power supply to reduce the ripple overall and smooth out the voltage. The size of the capacitance depends on the supply, but something in the uF to mF range is typically used in low to medium sized power supplies.

    Regards,

    David Hopkins