Hi I am using P89V51RD2 to run two stepper motors(4 phase) on port 2. I have connected two different motor drivers for each motor(L293D).The system worked fine for sometime,but then for some reason, controller blew up.Then it happened to two more chips. Drivers have a regulated 12V supply. Can some one figure out the reason?
And because of the diodes, the max continuous current has decreased from 1A to 600mA :(