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
37/70
L6472
Phase current control
70
Figure 19. Fast decay tuning during the falling steps
7.4
Torque regulation (output current amplitude regulation)
The output current amplitude can be regulated in two ways: writing the TVAL_ACC,
TVAL_DEC, TVAL_RUN and TVAL_HOLD registers or varying the ADCIN voltage value.
TVAL_DEC, TVAL_RUN and TVAL_HOLD registers or varying the ADCIN voltage value.
The EN_TQREG bit (CONFIG register) sets the torque regulation method. If this bit is high,
the ADC_OUT prevalue is used to regulate output current amplitude (see
the ADC_OUT prevalue is used to regulate output current amplitude (see
). Otherwise the internal analog-to-digital converter is at the user’s disposal and the
output current amplitude is managed by the TVAL_HOLD, TVAL_RUN, TVAL_ACC and
TVAL_DEC registers (see
TVAL_DEC registers (see
The voltage applied to the ADCIN pin is sampled at f
S
frequency and converted in an NADC
bit digital signal. The analog-to-digital conversion result is available in the ADC_OUT
register.
register.