AMC7135

These things were never “designed” in the first place.

7135 data sheets call for up to 1000 ^2 mm trace area per chip for heat sinking at max load. Not only do we not have that we insist on putting them within a few mm of a powerful heat source.

And the 105c board doesn't even have a complete trace under the middle of the 7135s, just a little pad connected to nothing for the pin and a little pad in the back for the tab.

If you have the space for multiple boards, use them and don't use more than 8 chips each. But that's just not practical in most cases. The main bottleneck is the vias for ground & LED-. There's only 3 for each and the ones for LED- are smaller than the ones for the ground planes. So if you have the space for multiple boards, use a separate jumper wire for each side of the boards for both ground & LED-. And don't use the PCB as the carrier for the BAT+ to LED+ path, either. It only needs a small wire to run the MCU but run the LED+ around the driver and straight to the battery/contact board.

Good to know, thanks guys! I will be sure and keep all that in mind when reconfiguring my Terminator.

Excellent info for a newbie.

Device data: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&ved=0CDcQFjAG&url=http%3A%2F%2Flib.chipdip.ru%2F709%2FDOC000709557.pdf&ei=f_cdVMTHKoTsoATDiIGACw&usg=AFQjCNHJfR5f952q9jAS99IVuC9zUVNtXw&sig2=\_AuWfEBvFql5cxQ0vSh5Tw&bvm=bv.75775273,d.cGU