> Much of the hardware designs are cut and paste of each other. The power i= s > coming from a 28V Li-Ion battery, the regulators are the same National/TI > LM2675 parts, the FET drivers are the same Fairchild FAN7382. The three > phase unit has massive TO-220 FETs and the other has some smaller SOIC 8 > parts. I haven't looked at that driver chip, but wonder of you have some strange c= ondition causing it to have overlap in its output (as distinct from overlap= in your power transistors). Have you tried patching in some other manufacturers driver chip on your tes= t bed (dead bug if need be)? Maybe get a sample from Microchip to rule that= possibility out? --=20 Scanned by iCritical. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .