L6219R

Functional description

11/16

3.4

Single-pulse Generator

The pulse generator is a monostable triggered on the positive going edge of the comparator

output.The monostable output is high during the pulse time, toff , which is determined by the

The single pulse switches off the power feed to the motor winding, causing the winding

current to decrease during toff.If a new trigger signal should occur during toff, it is ignored.

3.5

Output Stage

The output stage contains four Darlington transistors (source drivers) four saturated

transistors (sink drivers) and eight diodes, connected in two H bridge.

Figure 4.

Principle Operating Sequence

The source transistors are used to switch the power supplied to the motor winding, thus

driving a constant current through the winding.It should be noted however, that is not

permitted to short circuit the outputs.

Internal circuitry is added in order to increase the accuracy of the motor current particularly

with low current levels.

3.6

dV/dt values are then assumed.