DocID022729 Rev 5
35/70
L6472
Phase current control
70
Figure 16. 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.
$0
W)$67
W)$67
W)$67
W)$67
