34177Re: [beam] H_Bridge
- Mar 1, 2003Hi Mark;
Mark Hillier wrote:
>I have never liked this part.
> > 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 ?
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
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:
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.
> A complete kit with PCB is also available
> Mark Hillier
> President, HVW Technologies Inc.
> Tel:(403)730-8603 Fax:(403)730-8903
> Development Tools for Embedded Design
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