Do you suspect there was a short-circuit somewhere or is this a specific type of current limiting? Sorry, I am new to the field. It happened on two separate drivers with different motors in each case. In both cases, the motors worked fine until I put load on them and then the ED blew up within 1 second. Both motors were rated around 1.2 or 1.5 amps. So, I was thinking it was because of excessive current draw.
The datasheet states: "The current in each of the two output H-bridges is regulated with fixed off time pulsewidth modulated (PWM) control circuitry. The H-bridge current at each step is set by the value of an external current sense resistor (RS), a reference voltage (VREF), and the DAC’s output voltage controlled by the output of the translator." and "Adjustable current control from 150mA/phase to 750mA/phase"
So, it should not have let more than 750mA through but it burned when the current demand increased.