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help on a synchronous buck converter

Discussion in 'Microcontrollers, Programming and IoT' started by Sanda Ranaivo, Jul 30, 2019.

  1. Sanda Ranaivo

    Sanda Ranaivo

    3
    0
    Jul 30, 2019
    Hi everybody,

    I'm working on a synchronous buck converter.
    I use an IR2104 to control both Mosfets 1 and 2 (with arduino).
    It worked very well by charging a battery OR by feeding a load (Fig1).
    Then after, I created another terminal block to separate the battery and the load (Fig2).

    I put a Mosfet3 (order directely by arduino) to connect or disconnect the load according to the voltage level of the battery.

    And that's where I encountered a problem that I cannot understand at the moment.
    As soon as I turn on the converter, the (6) VS, (7) HO and (8) VB terminals of the IR2104 are burned and the Mosfet1 is heating up. IR2104_CIRCUIT.png View attachment 45777 View attachment 45778
     

    Attached Files:

    Last edited: Jul 30, 2019
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,277
    1,878
    Nov 17, 2011
    Pictures 2 and 3 show as hardly readable (almost black). Please try again and upload clear pictures.
     
    Sanda Ranaivo likes this.
  3. Sanda Ranaivo

    Sanda Ranaivo

    3
    0
    Jul 30, 2019
    I've already done it
     
  4. Alec_t

    Alec_t

    2,682
    710
    Jul 7, 2015
    Show us how you have all the components connected; particularly the IR2104.
    Layout can be important. Is the circuit on a pcb or on a breadboard?
    What is the FET switching frequency?
     
  5. Sanda Ranaivo

    Sanda Ranaivo

    3
    0
    Jul 30, 2019
    Mosfet1 : HO (7)
    Mosfet2: LO (5)
    Vpv + : Vcc (1)
    Vpv - : COM (4)
    The switching frequency is 31 kHz
     

    Attached Files:

    Last edited: Jul 30, 2019
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