Re: [CAD_CAM_EDM_DRO] Re: stepper driver help

"Wayne C. Gramlich" <Wayne@...> wrote:

> I have never been able to find inexpensive LMD18245's;
> they are always the $10-$20 range. Whereas, the venerable
> L298 can do 3.5 amps at 48 volts and I can easily get
> them for $3-$4 each. Yeah, I know the LMD18245's are
> FET technology, and the L298's are bipolar, but in the
> end, who cares, they both work just fine.

The L298 can do 2-3 A (depending on duty cycle) *or* 46 V, but not at the
same time. It's limited to 25 Watts, ie 3 A @ 8.3 V or 0.5 A at 46 V.
And that's *total* power dissipation, the L298 has two internal H-bridges,
so if you use both you're limited to 12.5 Watts per H-bridge.

Source: the ST Microelectronics L298 Data Sheet
<http://www.st.com/stonline/products/literature/ds/1773/l298.pdf>

If anyone knows how to push the L298 design to 138 Watt (3 A @ 46 V),
I'd love to hear it.


--
Sebastian Kuzminsky