Connect with us

help on a synchronous buck converter

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

Scroll to continue with content
  1. Sanda Ranaivo

    Sanda Ranaivo

    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

    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

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


    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

    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
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day