making an H-Bridge

Discussion in 'Embedded Systems and Microcontrollers' started by allahjane, Apr 17, 2013.

  1. allahjane

    Thread Starter Member

    Sep 19, 2012
    Hello there,

    I want to design an H-Bridge for my application.
    I learnt that I need two transistors of each type NPN and PNP to make a H-bridge in the simplest way.

    here are the power transistors I am going to use

    The PNP one

    and the NPN

    so my question is are those two type of transistors ideal to make a working H bridge.

    What is the required voltage to drive the transistor on and off, can you drive them directly using the output from the I/O pin of an AVR (TTL) ?
    It would be best if someone can refer a link related to it
  2. Arm_n_Legs

    Active Member

    Mar 7, 2007
    What is your H-bridge for? Attached is a H-bridge circuit for driving a piezo. Transistors used are 2N3906 and 2N3904.
  3. allahjane

    Thread Starter Member

    Sep 19, 2012
    Motors I intend to run motors with 5Amp each so I would use four mosfet for each half bridge to make current go parallel in two routes instead of whole 5 amp through just one mosfet vaporizing it
  4. tubeguy

    Well-Known Member

    Nov 3, 2012
    A motor has a much higher starting or stall current than the running current. The mosfets should be sized to handle that current.

    What voltage is the motor?
  5. allahjane

    Thread Starter Member

    Sep 19, 2012
    12v DC i'll power them through a NiCd Battery pack (1.2volt x10 cells)
  6. mohitjindal

    Active Member

    May 25, 2009
    You can buy Hercules DC Motor driver board from nex. I purchased it and working with it.