Battery selector and Comparator

Discussion in 'The Projects Forum' started by asvinimurugaiyan, May 21, 2013.

  1. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    Hi friends,
    Here i have attached a circuit file.In that circuit VOUT is dropped, when the comparator is connected to the circuit. What is reason for that voltage drop?. Is there any solution for that?. please refer my attachment file.
     
  2. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    Hi friends,
    Here i have attached a circuit file.In that circuit VOUT is dropped, when the boost regulator is connected to the circuit.we are using NCP1402 boost regulator. What is reason for that voltage drop?. Is there any solution for that?. please refer my attachment file.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,086
    3,024
    You've shown the comparator as a 2-pin device. I don't know what that means. Are you referring to just the power pins?
     
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  4. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    The drawing is pretty incoherent. This is not meant as an insult, but do you know what a comparator is? Or what is the boost regulator, have a data sheet?
     
  5. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    comparator is 14pin LM319N ic. i m just put the block in the circuit.
     
  6. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    boost regulator is NCP1402. i m having a datasheet.drawing is not important. "what logic in that?" that's matter........... ok.......
     
  7. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    Uh, no. Accurate schematics are vital. It's like asking how tall is that without giving a clue what item/person you are talking about. Very few people here can read minds.
     
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  8. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    without clue ah???? what clue you want? i told , we are using NCP1402 boost regulator na.
     
  9. RamaD

    Active Member

    Dec 4, 2009
    254
    33
    What do you want the circuit to do?
    The MOSFET symbol is not clear at all. The gate is opposite to the source terminal and the
    arrow is connected to the source terminal from the middle. It is not the case with your diagram. Which is the source and drain in your diagram?
     
  10. asvinimurugaiyan

    Thread Starter New Member

    May 21, 2013
    6
    0
    In MOSFET, 1.2V power connected to source, and the output taken at the drain. we are using IRLML6402 MOSFET.
     
  11. RamaD

    Active Member

    Dec 4, 2009
    254
    33
    Gate is not made sufficiently negative to turn on the MOSFET. Voltage dropping is because the MOSFET is in linear region - barely into conduction, if at all!
     
  12. Ramussons

    Active Member

    May 3, 2013
    557
    92
    What does the comparator(s) compare?

    Ramesh
     
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