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34177Re: [beam] H_Bridge

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  • Duane C. Johnson
    Mar 1 8:38 AM
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      Hi Mark;

      Mark Hillier wrote:
      >
      > > Hi,
      > > Does anyone know which transistors(readyly available)
      > > to use in a standard H-bridge configuration to drive
      > > 12v, 2amp motors?
      > > Any idea about FZT605,705 OR BCV27,26 Darlignton
      > > Pairs?
      >
      > How about the L298N ?

      I have never liked this part.
      OK, it has it's uses. I have used it.

      My basic problem with the L298 and others like it
      is the poor efficiency. It uses emitter follower
      transistors on the high side. This about guarantees
      that there will be 3 volts or more across the high
      side transistors.

      This is why the Tilden and other bipolar H-bridges
      are so favored as they have complementary transistors
      with much higher efficiency.

      With frustration with the L298 I looked for a better
      H-bridge. I came up with this circuit:
      http://www.redrok.com/actuator.htm#act01
      OK, it has some warts, but works well if high switching
      speeds are not needed.

      I presented the design to our legal department and
      we decided to patent it. It's still pending.

      Also, the LMD18200 with its internal MOSFET gate
      drive charge pump works much better than the L298.

      > http://www.hvwtech.com/pages/products_view.asp?ProductID=198

      > A complete kit with PCB is also available

      > Mark Hillier
      > President, HVW Technologies Inc.
      > Mark@...
      > Tel:(403)730-8603 Fax:(403)730-8903
      > http://www.HVWTech.com
      > Development Tools for Embedded Design

      Duane

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