H-BRIDGE selection

Discussion in 'The Projects Forum' started by davis103, Jul 7, 2008.

  1. davis103

    Thread Starter Member

    Jun 9, 2008
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    Hi everybody:

    I posted a question not to long ago about an H-Bridge problem i have. Based on some of the answers this H-BRIDGE is not a good choice. I need to have an H-BRIDGE that could handle from4 to 5 amps per channel. In other words mi controller gives me a high and a low and my motor moves in one direction with a maximum drawn current of 4 to 5 amps. and viceversa for the other direction.
    Does anybody know of any H-BRIDGE with ratings of 12v at 4 or 5 amps continuos output?

    Thanks for your attention!
     
  2. davis103

    Thread Starter Member

    Jun 9, 2008
    27
    0
    I found MC33186 and MC33187 from DIGIKEY and they would have to be solder onto a PCB and then tested. It will be better to have one that could be tested on a breadboard. In addition this chips have a lot of features which i wont use. Anybody know of one?

    Thanks again.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You're not going to find one that will handle that much power that is breadboard-able.

    You'll either have to use discrete components (like I said in the other thread) or go with a solder-down version where you have provided a large heat sink area.

    VNH3SP30-E - ST Microelectronics makes it, Mouser stocks it. It will handle 30A continuously at 12v. You will have to solder it to a board.
    Datasheet:
    http://www.st.com/stonline/products/literature/ds/12688/vnh3sp30-e.pdf
    Mouser's site on it: http://www.mouser.com/Search/ProductDetail.aspx?qs=po45yt2pPpsUU4ftWFEieA==

    Here is a Freescale IC that can source 5A continuously at up to 40v:
    http://www.freescale.com/files/analog/doc/data_sheet/MC33886.pdf
    Mouser's site on it: http://www.mouser.com/Search/ProductDetail.aspx?qs=N2XN0KY4UWUCF628gPmODw==

    But if you register on ST Microelectronics' site, they might send you a few samples overnight, for free. Tell them what your project is. They may help you with it as well.
     
  4. davis103

    Thread Starter Member

    Jun 9, 2008
    27
    0
    thanks man your info is greately appreciated
     
  5. davis103

    Thread Starter Member

    Jun 9, 2008
    27
    0
    Where can i get this things for the heat sink they suggest in data sheet?

    Do i have to make the PCB or does it come with it ?
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You have to design the PCB for it.

    I suggest that you'll need to scab on some flat copper stock, as most blank PCBs you'll find for sale nowadays have 1oz copper, which isn't much. Copper has become really expensive. You'll need it thick enough to carry the heat away.

    Marlin P Jones & Associates is a good place to find blank PCB's.
    http://www.mpja.com
    They have a sale going on right now for 12"x12" FR4 1oz clad both sides, $8.95/board.

    If you aren't pretty experienced at making PCBs and soldering, I suggest you go with the discrete components solution; namely two separate N-ch power MOSFETS and an H-bridge driver IC. Actually, you could use that IC you have for a driver, and put the two N-ch power MOSFETS between the driver and the load.

    If you're not going to be turning this thing on and off rapidly (as in PWM) you could use a pair of logic-level power MOSFETS and just do away with the driver altogether.
     
    Last edited: Jul 8, 2008
  7. davis103

    Thread Starter Member

    Jun 9, 2008
    27
    0
    Well the thing i will do with the load (linear actuator) is that when it reaches a certain force (by retracting the actuator some distance starting from full stroke) it will stop for about 1 minute and then the driver will switch the direction to extract the actuator (decrease the load or Force exerted) to full stroke again. This process will repeat sevral times.
    Do you think this will work with the two power mosfets and the IC driver (tc4424) ?

    If that is the case how can i connect the load with the mosfets to have forward and reverse direction working properly?
     
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