Overheating stepper shield
As I'm a newbie, please forgive my ignorance for asking what maybe an obvious question.
I've got an Arduino Uno and a DK Electronics v1.0 motor shield (powered separately at 12v). I downloaded a library and managed to get a NEMA 23 stepper motor working. Trouble is, the chip on the shield doing all the work gets scarily hot in next to no time. The rated current of the motor is 1A, although when I tried it, it was under no load. I've checked the power consumption when driving the motor from a standalone controller and it's drawing no more than 250mA.
Do you guys think:-
a) I'm overloading the shield?
b) I've got a fault?
c) I scare too easily?
Any feedback will be gratefully received.