Datasheet

Functional description L6219
8/14 DocID1377 Rev 14
2.4 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, t
off
, which is determined by the
time components Rt and Ct.
Equation 2
t
off
= 1.1 · R
t
C
t
The single pulse switches off the power feed to the motor winding, causing the winding
current to decrease during t
off
. If a new trigger signal should occur during t
off
, it is ignored.
2.5 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.