Need smart switch/intelligent switch type of current limit IC

Discussion in 'Electronic Design' started by Yzordderrex, Oct 16, 2008.

  1. Yzordderrex

    Yzordderrex Guest

    Greetings,

    I need to add current limit to a buck converter. The buck converter
    is good for about 1.5A -2A (TPS62110) while I would like to limit the
    current to about 0.2 amps. The reason I am using such a large
    converter is that I already have 2 on the board and it has a lot of
    other functions that I need) The converter is selectable 5v or 8v
    output. I am considering a resettable fuse kind of a thing but I
    suspect if the output is shorted I will get large narrow pulses that
    the resettable fuse will not respond to. I am not sure what my
    inductor will do with these large narrow pulses. Assuming the wire
    can handle the rms current, will the ferrite core have a problem with
    the large 2.5A pulses. Inductor is rated for 1.5A before Isat.

    I would like something like a Fairchild FPF2164 except it has to go to
    8v, or else something like a STmicro L6377 except it has to go down to
    5v. Unitrode/TI makes a part that might work, but it is a bit of a
    dinosaur (UC37131).

    I will be going to all the vendors today, but if anybody knows of
    somethingoff the top of head then please speak up.

    Regards,
    Bob
    N9NEO
    Just say NEO
     
    Yzordderrex, Oct 16, 2008
    #1
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