The L6204 is a DMOS dual full bridge drivermainly designed to drive bipolar stepper motors.All the inputs are TTL/CMOS compatible andeach bridge can be enabled by its own dedicatedinput. The windings current can be regulated bysensing the voltage drop across two low value resistorsat the low end of both the bridge: this isthe feedback for the current controller. To feedthe gates of the upperDMOS, a peak to peak rectifiercharges a capacitor in series with the PowerSupply voltage at the optimum DC level defined byan on-board square wave oscillator. The L6204 ,with 0.5 A drive capability without external heatsinkup to 70°C, is packaged in a 20 leads PowerDipwith four heat transfer pins. The Block diagram ofthe device is shown in fig.1.