I am experiencing excessive heating problem with SN754410NE (SN754410). I know that I can use heat sink, but I want to be sure that I am not doing something wrong.
I am using SN754410NE to drive a bipolar stepper motor. My circuit is similar to schematic below. The current rating of the stepper motor is about 0.6 A and since continuous output current is given as 1.1A in the data sheet, I don't expect excessive heat.
However, the other issue is output supply current is given as 70mA in the data sheet. So, for example, if I energize one solenoid of motor output current of '1out' pin will be 0.6 A (which is below rating) however '2out' pin supply current will be also 0.6 A (which is above rating). Am I correct? Can this cause excessive heat?
SN754410NE data sheet: http://www.ti.com/lit/ds/symlink/sn754410.pdf
Thanks in advance.