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Help identifying the SMD component

Discussion in 'General Electronics Discussion' started by Krasimir, May 4, 2015.

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  1. Krasimir

    Krasimir

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    May 4, 2015
    Hi, please help identifying the burnt SMD component ( I suggest it is a MOSFET ). It is from 2.4 GHz AV transmitter (picture attached). There are partially remaining simbols on burnt chip (see freehand writing on right down corner ). I try to partialy track the PCB . I apply close view of the PCB also (both sides).
     

    Attached Files:

  2. mofy

    mofy

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    Dec 19, 2014
    It is a switch mode regulator of some sort, stepping the input voltage down to a controlled level for the 78M05 so it doesn't dissipate too much power.
     
    (*steve*) likes this.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Actually it seems to provide another rail, so it's not just to reduce distortion in the 78L05, even though it does do that too.
     
  4. Krasimir

    Krasimir

    3
    0
    May 4, 2015
    Thanks for your suggestions. First I also supposed the IC to be 9V voltage regulator but could it be a MOSFET , connected as reverse voltage protection, and that SMD component to be 2 MOSFETs in one chip.?
    The IC is too tiny to be voltage regulator, which assure 0.5 A as 78M05 will. The input voltage is announced to be 9-12V DC.
    If we assume the input voltage is 9V , would it works as regulator?

    When I post this topic ,as a last chance , I hoped that somebody has the same transmitter and will be kind to check the chip.
    I spent about a week in searching the net for close view of the transmitter PCB and suitable IC , but with no result. I even can't find a chip manufacturer with such a logo.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Why do you think it's too small? Switching regulators do not dissipate a lot of heat.

    If your circuit diagram is correct ( and it looks like what I'd expect) then it is a switching regulator.
     
  6. Krasimir

    Krasimir

    3
    0
    May 4, 2015
    Thank you very much. You are right.
    I found a XLSEMI switching regulator XL 1509 , with the same pin configuration and the same application circuit usage.
    It must be this chip or similar one. Thanks again.
     

    Attached Files:

  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Well done! The one you need is the one with the adjustable output voltage.
     
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