L298N dual full bridge driver
@ October 28, 2008
- Component category: Output devices, motors, servos and locomotion
Futurlec has a good range of components, their prices are reasonable, they have no minimum order charge and they deliver around the world. Postage is a bit slow (up to 2weeks).
A compact cheap easy solution for driving your motors!
This dual "H" bridge is ideal for allowing processors to control larger motors with different voltage requirements. It can drive one stepper motor or two dc motors. It will handle up to 2A per "H" bridge with adequate heatsinking and will drive motors up to 46V while working with 5V control signals from your proccesor.
The datasheet even includes a sample schematic and board layout.
http://www.futurlec.com/index.shtml
It has been said that this IC will not plug into a breadboard because of it's unusual pin arrangement.
Here's proof! The long legs are very flexible, insert them partway first then align the shorter legs at the back. It pushes in easily. This is a closeup of Pictomatix's motor driver.
@ Fri, 2009-11-13 04:43
can i control this dual h bridge L298 with pc??
@ Fri, 2009-11-13 12:24
Yes
@ Sun, 2009-03-29 23:16
Zinc Paste
@ Mon, 2009-03-30 07:03
Any grease is a better
@ Mon, 2009-03-30 19:56
So that's why
@ Sun, 2009-03-29 15:40
Great, I am using that
Great, I am using that Motor-Driver on my current Project "Explorer", but it's getting pretty hot, I am using about 1.5A with 2.2A Peak, the datasheet says it should not be used for more than 2A, but it's working, might need to think about some cooling though.
What kind of heatsink would fit this chip?
@ Sun, 2009-03-29 20:46
Heat sinks
This is a photo of how I've set mine up. The heatsink came with adheasive heat transfer tape. Admittedly I don't use more than about 1A per bridge. You may need a bigger heatsink, especially if you exceed 2A during motor stall. That is what the hole is for, to mount large heatsinks. If you can't get a proper one then do as Robologist suggest. Try and have the section that goes against the chip perfectly flat and smooth for better conductivity. Rubbing it against some wet and dry sandpaper on a piece of glass is the best way. Then use some heat transfer compound. If you can't buy any then try some zinc cream. That really thick white sunscreen. It has a lot of zinc oxide same as heat transfer compound.
@ Mon, 2009-03-30 13:15
looks really neat
I haven't found a heatsink that fitts the multiwatt 15 specs yet, but I might just buy one that is a little bigger and then cut it to the right size.
I'll post some pics of my setup on my robot-project's sie when I got everything working
@ Mon, 2009-03-30 20:53
Don't cut it down!!!! Bigger
Don't cut it down!!!! Bigger is better. Especially under heavy load. Worse comes to worse, drill a new mounting hole or mount the driver and the large heatsink off of the board with ribbon cable connecting to the board. You can get connectors that clamp onto ribbon cable and then plug into a board like a chip. It's called a displacement header.
@ Wed, 2009-04-01 16:10
Thank good I m reading this
Thank good I m reading this today ( just befor I wanted to get out my Saw^^)
Don't worry, I'll try it with the big Heatsink and cut it only if it's cool enough. I've got three of those drivers laying round here, so if I'll burn one of them it's not so bad.
The displayement Headders won't be needet, cause I can give the IC as much room as it needs on my layout. For now, it's all on the Breadboard anyway.
But thanks for the advice