Electrical and electronics questions

Discussion in 'General Electronics Chat' started by Kanniyappan, Jun 10, 2011.

  1. Kanniyappan

    Thread Starter New Member

    Oct 1, 2010
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    0
    What is the purpose of the diode(D5) in the circuit :confused:
    [​IMG]
     
  2. k7elp60

    Senior Member

    Nov 4, 2008
    478
    69
    It is to insure the output terminal voltage is never greater than about 1V of the input terminal. If that happens the regulator could fail. With the way the diode is connected, if the input is higher than the output the diode will not conduct. If the output is higher the diode conducts and brings the voltages near equal.
     
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  3. jegues

    Well-Known Member

    Sep 13, 2010
    735
    43
    These are known as protection diodes, they are put in place to prevent external capacitors from discharging through any low current points into the regulator, which could potentially damage the IC.

    D5 will protect your circuit from any discharge coming from the capacitors C4 & C5.

    You can read more about it on the data sheet of the IC.
     
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  4. Kanniyappan

    Thread Starter New Member

    Oct 1, 2010
    8
    0
    bu how you all can judge the purpose of the diode with this circuit diagram while i can't pls tell me also the uses of every electronic components and their response for the different output
     
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