L165Figure 9. Bidirectional DC motor control with TTL/CMOS/ µ P compatible inputs. Must be VS2 ≥ VS1; E1, E2 = logic inputs; VS1 = logic supply voltage Figure 10. Motor current control circuit with external power transistors (I motor > 3.5A). D1 to D4: VF ≤ 1.2 @ I = 4A trr ≤ 500ns Note : The inputvoltage level is compatible with L291 (5-BIT D/A converter). I R4 The transfer function is: M --- = --------- V Rx R 3 i Obsolete Product(s) - Obsolete Product(s) 5/9
