IR2109 - HO and LO problems

Discussion in 'General Electronics Chat' started by Skubby SkinnyChubby, Aug 20, 2015.

  1. Skubby SkinnyChubby

    Thread Starter New Member

    Jun 19, 2015
    25
    1
    Hi all,

    got a question for IR2109 HO and LO pin

    schematic diagram,datasheet of component used attached*
    my bootstrap capacitor i'm using a 100nF because i can't find any 506nF (maybe there is no such value for capacitor)
    CW and ACW is my signal pin to control my U1 and U2 respectively
    i'm putting a 24V to CW and ACW which will be step down to ~12v*

    ideal result is when i did not put in 24v to my CW or ACW
    U1 & U2:
    Pin 2 (IN) = 0v
    Pin 5 (LO) = 0V
    Pin 7 (HO) = 0V
    which means none of my MOSFET is turn on.


    First problem(s) is
    when i didn't put any voltage to my CW and ACW
    U1
    Pin 7 (HO) = 12v
    Pin 5 (LO) = 15v

    U2
    Pin 7 (HO) =0v
    Pin 5 (LOW) = 15v

    which means both of my lower side MOSFET is turn on and one of my High MOSFET is turn on = short circuit

    i've checked my connections and part numbers... but still cant find the reason why it got this kind of problems


    whoever have this same problem as me before and already solved it/ any person know the reason why... please tell me..need to solve this problem ASAP..

    THANKS A LOT GUYS FOR READING AND REPLY :):):):):):):):)
     
    Last edited: Aug 20, 2015
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
  3. Skubby SkinnyChubby

    Thread Starter New Member

    Jun 19, 2015
    25
    1
    BUMPS
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,498
    2,364
    For a start did you read the attachment in #2 regarding gate components?
    Max.
     
    Skubby SkinnyChubby likes this.
  5. Skubby SkinnyChubby

    Thread Starter New Member

    Jun 19, 2015
    25
    1
    problem solved :)
    thanks !
     
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