STMicroelectronics Fully integrated stepper motor driver mounting the L6472 in a high power PowerSO package EVAL6472PD EVAL6472PD Data Sheet
Product codes
EVAL6472PD
DocID022729 Rev 3
35/70
L6472
Phase current control
70
. 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
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
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.
control system to return to the reset state.
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