L6285
CHC DC Motor Driver
The DC motor driver is a DMOS full bridge with a
PWM Open Loop Voltage Control. Fig.5 shows
the theory of operation. The Cosc Capacitor is
charged by a constant current source. The oscil-
lating voltage value is from 0V to the V1 level in-
ternally fixed at V1 = 2/3 VS. The output duty cy-
cle is controlled by the V2 voltage. The opera-
tional range of V2 is from 200mV to V1. Fig.3
shows the DMOS status during PWM: tON and
tOFF bridge configurations. While the PWM Duty
Cycle defines the motor speed (not controlled
since the loop is open),the logic level of IN1 and
IN2 can choose the direction of the motor.
Figure.5: DC Motor Driver CHC
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