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?
Did you connect external free-wheeling diodes on all motor windings?
Have you verified that the output current is within spec?
The diodes are not required,as l293d has them in-built. I have verified the current,and it is within limits.
And because of the diodes, the max continuous current has decreased from 1A to 600mA :(
The diodes are not required,as l293d has them in-built. If the wires from the l239d to the motor is of any length, diodes at the motor may still be required
Erik