34231Re: [beam] H_Bridge
- Mar 3, 2003
> Hi Mark;Agreed. The L298 has poor efficiency, but in many cases it isn't a
> 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.
huge issue. It *is* farily compact and inexpensive, which is nice.
> This is why the Tilden and other bipolar H-bridgesTrue, but these will handle only a single motor each and they are
> 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.
something like triple the cost per unit. If you consider that you need
tow of them to equal the function the cost of a single L298, then it's
SIX times more expensive !
President, HVW Technologies Inc.
Development Tools for Embedded Design
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