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L6480 Datasheet(PDF) 38 Page - STMicroelectronics

Part # L6480
Description  The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping.
PDF  73 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6480 Datasheet(HTML) 38 Page - STMicroelectronics

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Phase current control
L6480
38/73
Doc ID 023278 Rev 3
To obtain different current values during acceleration and deceleration phase, two different
final slope values, and consequently two different compensation curves, can be
programmed.
Acceleration compensation curve is applied when the motor runs. No BEMF compensation
is applied when the motor is stopped.
7.5
Motor supply voltage compensation
The sinewave amplitude generated by the PWM modulators is directly proportional to the
motor supply voltage (VS). When the motor supply voltage is different from its nominal value,
the motor phases are driven with an incorrect voltage. The L6480 can compensate motor
supply voltage variations in order to avoid this effect.
The motor supply voltage should be connected to the integrated ADC input through a
resistor divider in order to obtain VREG/2 voltage at the ADCIN pin when VS is at its nominal
value (see Figure 18).
The ADC input is sampled at fS frequency, which is equal to PWM frequency.
Figure 17.
BEMF compensation curve
Figure 18.
Motor supply voltage compensation circuit
AM12836v1
ADCIN
ADC
5
f
PWM
ADC_OUT
V
S
V
REG
R
A
R
B
V
ADCIN = VS x RB
/ (R
A
+ R
B
)



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