When the current in the load winding reaches the programmed peak value, the voltage across the sense resistor (Rsense) is equal to Vref and the corresponding comparator resets its flip-flop interrupting the drive current until the next oscillator pulse occurs. The peak current in each winding is programmed by selecting the value of the sense resistor and Vref.
The motor windings will take 1A at 8.6V, the supply is 12V, the L298 will drop 3V or so at 1A, so the motor will only see 9V, no need for the L6506 at all I think (unless you want to run at lower currents)...
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