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Stepper motor controller with L6506 and L298

Question asked by 44903 on Oct 1, 2012
Latest reply on Mar 11, 2013 by Enrico Poli
Hi,
I'm new to this forum, because I really need some help designing a driver board for a stepper motor. The motor has to phases, 1A per phase, 8.6V and will be controlled over A+/- and B+/- (bipolar). The board will be powered via a 12V input.

I want to design this circuit: http://circuits.datasheetdir.com/391/L6506-circuits.jpg

The datasheets:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00000097.pdf
http://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf

I have some question, I give them numbers to help understand.

1. Could you help me calculate Rsense? As I read, Ipeak is I per phase, so 1A in my case. Vref is 5V in this circuit, right? So in my case, I would need 5Ohms. This would leave me with 2 30W resistors. Is this correct? What about the maximum rating of Vsense? Or what voltage comes out of the L298 sensing pins?

2. Between pins 16, 17 of the L6506 and GND, there is another resistor. What for and what size?

3. In all, there are 3 enable inputs (1 on the L6506 and 2 on the L298), can I just give them 5V and it will work?

4. Will 1N4004 diodes do?

I would be really happy if you could help me here..

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