Design DC motor using H bridge L298 ???

Wesam:

You start by finding and reading the L298 the spec. sheet.

There is not much to using a an L298. You must be sure that you install the free wheel diodes on the back of the chip. Here is a URL to a design I have that uses them:

In this design I am using 1 L298 to drive 1 motor with a maximum current draw of 3.5A. I use two L298's one for each motor of a robot.

There are many more L298 designs out there on the web.

Enjoy,

-Wayne

Does the L298 come in a L298D model? That has fly wheel diodes built in. Or get some free SN754410DNE's as samples from Texas Instuments like I did!

Cheers

|-]

Dale

There is an L293D chip that has the clamping diodes built-in, as the

754410 also does. However, these are only good for 600-mA and 1-Amp, respectively, and are DIP-packages that get rather warm at higher current levels. The L298 requires external clamping diodes, but can handle up to 2-Amp, as long as you screw on a good-sized heatsink.

Dale:

No the L298 does not have a "D" variant with the free wheel diodes built in. That is why I called that issue out. (Also, the original question just mentioned the L298.)

The SN754410 is the pin equivalent of the L293D although it has a higher current capacity 1.1A per H-bridge.

The following table should help:

Part H-Bridge Current H-Bridges External Diodes ========================================================== L293D 0.6A 2 Not Needed SN754410 1.1A 2 Not Needed L298 2.0A 2 Needed Ganged-L298 3.5A 1 Needed

Have fun,

-Wayne

Well done Wayne...thanks for bringing me up to date!

Cheers

:-]

Dale