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Thread: LED Driver IC 51LP

  1. #1

    Confused LED Driver IC 51LP

    Hi All,

    This is my 1st post and I apologize if it is in a wrong section. Please feel free to delete or move to the right section.

    I have a 9W LED bulb and it has a transistor like SOT92 IC marked as 51LP and beneath it marking F48, which is blown up.
    I want to repair this and coudln't find the part nor a datasheet to see if possible to find a substitue.

    Attached are few shots.

    Thanks
    Attached Images Attached Images

  2. #2
    .... Silvio's Avatar
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    I am not sure about this but it could be TL751LP. This is a low dropout voltage regulator

    here is the link for the datasheet https://www.alldatasheet.com/datashe...I/TL751LP.html

    Regards Silvio

  3. #3
    Hi Master Silvio,

    Many thanks for your reply and the link.

    Quote Originally Posted by Silvio View Post
    I am not sure about this but it could be TL751LP. This is a low dropout voltage regulator

    here is the link for the datasheet https://www.alldatasheet.com/datashe...I/TL751LP.html

    Regards Silvio
    I got the pdf and as per page 2 the "ORDERING INFORMATION" table and the "TOP-SIDE MARKING" column, it does not include any matching markings for "51LP F48" as per the listed/below:

    TL750L05C
    50L05C
    51L05C
    750L05C
    TL750L05C
    50L08C
    750L08C
    TL751L10C
    50L10C
    51L10C
    750L10C
    50L12C
    51L12C
    750L12C

    Since you are a master and this driver circuitry confuses me, then I need to ask isn't this circuit a buck converter so it needs a pwm ic?

    I managed to find a datasheet but its in chinese and hope it helps.

    http://www.radioradar.net/en/datashe...2-ETC.pdf.html


    Much appreciated.
    Last edited by smpsdiyer; 03-13-2020 at 08:10 AM.

  4. #4
    .... Silvio's Avatar
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    There exist a 3 legged chip such as the TOP family like TOP221 which is used as a flyback buck converter. I am sorry to say that a chip with that name 51LP I never heard of. I guess you will be better off buying a small PSU that can power your leds. They are very cheap from E-Bay or Aliexpress.

    Regards Silvio

  5. #5
    Hi Silivio,

    Thank you for your reply.

    I was given a reply with this link by "JFJ" from a wellknown repair site's forum:

    https://www.olx.ro/oferta/kp1051-51l...tml#55cc21ad46

    and this with datasheet in english:

    http://www.kiwiinst.com/product_deta...3=24&id=132###

    It's the same IC.

    Hope it helps others.

  6. #6
    Good afternoon! Did you manage to repair the LED bulb using a replacement?

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