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Paralleling LMD18200T

Discussion in 'Electronic Components' started by Abe, Dec 30, 2003.

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  1. Abe

    Abe Guest

    Hi,
    I have been using the National's LMD18200Ts for about a year for
    motors requiring low currents (<2A). Now I need to use these for
    motors pulling something like 6A. There is one post somewhere
    mentioning that this IC can be paralleled. But does anyone have
    practical experience regarding this?
    Any information would be helpful.
    Thanks,
    Abhijit Karnik
     
  2. I have been using the National's LMD18200Ts for about a year for
    It seems straightforward enough, the only thing that would worry me is
    the possibility that - briefly - during direction changes, one device
    might change states a little slower than the other, which would
    momentarily short the power rails through both sets of drivers. Maybe
    it would be safer to go through a brief unpowered state (PWM low,
    BRAKE high) when changing directions.
     
  3. Tim Wescott

    Tim Wescott Guest

    I concurr. Shoot-through is nasty.

    Depending on your particular requirements you may also want to consider
    using a controller and discrete MOSFETs or the APEX power drivers (I think
    they go up to 6A). APEX parts are spendy and they don't cover the whole
    applications area, but when they work they'll save you engineering time. A
    controller and discrete FETs, on the other hand, will have a lower
    manufacturing cost but has the potential to absorb many hours of debug time
    before you can allow your design to escape to the manufacturing floor.
     
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