Datasheet

DocID022729 Rev 3 35/70
L6472 Phase current control
70
Section 7.1. The maximum fast decay duration is set by the TOFF_FAST value.
Figure 17. Adaptive decay - fast decay tuning
When two or more fast decays are performed with the present target current, the control
system adds a fast decay at the end of every OFF time, keeping the OFF state duration
constant (t
OFF
is split into t
OFF,SLOW
and t
OFF,FAST
). When the current threshold is increased
by a microstep change (rising step), the system returns to normal decay mode (slow decay
only) and the t
FAST
value is halved.
Stopping the motor or reaching the current sine wave zero crossing causes the current
control system to return to the reset state.
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