Quote Originally Posted by lerameur View Post
a ok , i get it,
By the way , anybody knows why My h_bridge, L298N get really really hot even with a heat sink and just 1.8 amp ?and yes it is connected to the 12v battery. Getting hot, and its not working anymore...
If it was me doing a project needing an H-bridge, I'd skip the H-bridge and just go with a set up using a bunch of logic-level N-channel enhancement mode MOSFETs (try saying that 3 times fast), or P-channel, whatever. That way I know for sure I can drive whatever it is I need to drive. And if the MOSFETs get too hot even after putting a heatsink on them, you can always parallel them. Which gets me to thinking...have you tried paralleling a couple of L298N's? I haven't read the datasheet, don't know if it's possible (or even wise)...might work though.

And 12v @ 1.8a does = 21.6watts, but only if the L298N has resistance across it, zero resistance = zero load. Maybe the L298N isn't being driven hard enough. (Sounds like it's time to get my butt over to the datasheets so I know what I'm talking about here).