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LM7812 Data Sheet Parameter

Discussion in 'Electronic Basics' started by Animesh Maurya, Oct 27, 2003.

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  1. I was reading the data sheet of LM7812 voltage regulator, here two
    parameters : Short Circuit Output Current & Peak Output Current are
    confusing me.

    Short Circuit Output Current & Peak Output Current for LM7812 are
    350mA and 2.2A respectively.

    According to me Peak Output Current will occur when output is short
    circuited, so the values for both the above parameters should be same.

    Textbook says that Peak Output Current occurs for a short duration of
    time, for what duration of time will I get 2.2 A current ?

    I need some explanation.

    Regards

    Animesh Maurya
     
  2. Short circuit curent is the current foldback value.
    This is a protection.
    With the proper attention to the maximum dissipation,
    you may expect to get 2.2 amps when operating normally.


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  3. At what temperature thermal shut down takes place.

    Thanks
     
  4. Luhan Monat

    Luhan Monat Guest

    Animesh Maurya wrote:

    I don't know the exact temperature, but its hot enough to burn your
    fingers!!!
     
  5. Surely it will burn my fingers.

    But I can make a guess about that temperature, data sheet says that
    operating temperature is in between 0 to 125 C.

    So one can think that thermal shut down may take place at temperature
    above 125 C.

    Iam not sure I just want to confirm it. What do you think?

    Animesh Maurya
     
  6. Le 01/11/2003 12:11:09, a écrit:
    Hello,

    I've 've found a japanese site on which they are giving some explanation on
    protection circuits in 3-Terminal Voltage Regulators. The site URL is
    http://www.njr.co.jp/index_e.htm (for english; no french :-( Then look for
    Products Data Sheets -> Integrated Circuits. Then LINEAR IC. In the POWER
    SUPPLY paragraph look at the 3rd document.

    Hope this will help
     
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