This circuit is a L6208 stepper motor controller. To build this circuit, we can implement slow decay. It allows lower ripple, lower power dissipation and avoids voltages below GND at output pins during recirculation. Here is the circuit :
Using component values on the schematic diagram of the circuit, the duty-cycle of this circuit is 63%, current ripple of this circuit is 29mA and the switching frequency is 25kHZ. This circuit uses 50V capacitor that allow voltage ripple of 200mV. This circuit also uses 0.5 Ohm sensing resistor because the reference voltage is 0.5V. The on-time of this circuit is 25µs and the off time is 16µs. [Source: STMicroelectronics Application Note]
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