L6472 STMICROELECTRONICS [STMicroelectronics], L6472 Datasheet - Page 34

• Manufacturer Part Number: L6472
• Description: dSPIN fully integrated microstepping motor driver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Phase current control
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As shown in
reference value improving dramatically the accuracy of the current control system: in fact the
average value of a triangular wave is exactly equal to the middle point of each of its
segments and at steady-state the predictive current control tends to equalize the duration of
the t
Furthermore, the t
(microstep change) in order to keep the PWM frequency as near as possible to the
programmed one (TSW parameter in the CONFIG register).
The device can be forced to work using a classic peak current control setting the PRED_EN
bit in the CONFIG register low (default condition). In this case, after the sense phase
(t
Figure 16. Non-predictive current control
SENSE
SENSE
) the power stage is set in the OFF state, as shown in
and the t
Figure
OFF
15, the system is able to center the triangular wave on the desired
PRED
value is recalculated each time a new current value is requested
time.
Doc ID 022729 Rev 1
Figure
16.
L6472