On Mon, 13 Mar 2006, Alan B. Pearce wrote:

>> I have been looking and I cannot seem to find a useful
>> part that is also popular, and obtainable. I am looking
>> for an integrated FET H bridge for up to 30V and 2A,
>> without drive circuitry.
>
> Does it really have to be a FET one ? To me the obvious choice from your
> description would be the ST L6203.

It has to be something that dissipates less than a L298 and has internal 
kickback diodes and active recirculation/rectification. A FET bridge has 
that. F.ex. something like L6204 and L6205 squeezed into the same case. 
Or two of these in the same case (even better). I know that it can be 
done and there are chips from Allegro that implement these functions 
(two bipolar stepper drivers in a un-heatsinked plcc good for 50V and 2A 
each), but they have the stepping sequencer built in, and that's what I 
do not want. I want to use the same part for solenoid, dc motor, and 
stepper drive.

Iow, there was a technology jump from L6505/L6204 type two chip 
solutions to A3677 (?) which has all the functions of 2xL6505/L6204 plus 
a stepping sequencer and serial interface and other things. And it has 
to be obtainable in small q. (preferrably dual sourced).

Examples of what is 'normal' now:

Two 35V 2.5A chopped bipolar stepper drivers in plcc, serial control and 
a bazillion current, microstepping and damping modes. (Digikey has this 
part): http://www.allegromicro.com/sf/3977/

I would like a 3977 without the brains, i.e. direct phase control from a 
micro.

Peter
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