![]() ![]() It would help if you gave some information about what you want to drive with the stepper motor and the torque rating of the stepper. The thermal calculations are a bit more complicated with a heat sink as you need to know the thermal resistance of the heat sink and insulating washer (If used) between the device and heat sink. You will have to repeat these calculations when you decide to build the unit properly using a heat sink. This will be the sense resistor value times the value of current you have calculated. (Using the maximum Vsat values.) You now calculate the required reference voltage. C per watt from memory.) When you know how much power you can dissipate you can work out how much current that equates to. ![]() From the difference between that temperature and the ambient temperature you can calculate the maximum power you can allow the device to dissipate using the thermal resistance to ambient. First decide on the maximum junction temperature you want the device to run at. (You do not want to use a heat sink for some unknown reason.) Start by doing the thermal calculations. ![]() You will need to do this twice as you do not seem to want to build it properly to start with. You do need a potential divider (Or a more precise reference voltage that does not rely on the supply voltage being stable.) You need to CALCULATE what reference voltage you need. ![]()
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