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L6480 Fiches technique(PDF) 39 Page - STMicroelectronics

No de pièce 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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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6480 Fiches technique(HTML) 39 Page - STMicroelectronics

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L6480
Phase current control
Doc ID 023278 Rev 3
39/73
Motor supply voltage compensation can be enabled setting high the EN_VSCOMP bit of the
CONFIG register (seeTable 37, Section 9.1.23). If the EN_VSCOMP bit is low, the
compensation is disabled and the internal analog to digital converter is at the user’s
disposal; the sampling rate is always equal to PWM frequency.
7.6
Winding resistance thermal drift compensation
The higher the winding resistance the greater the voltage to be applied in order to obtain the
same phase current.
The L6480 integrates a register (K_THERM) which can be used to compensate phase
resistance increment due to temperature rising.
The value in the K_THERM register (Section 9.1.15) multiplies duty cycle value allowing the
higher phase resistance value to be faced.
The compensation algorithm and the eventual motor temperature measurement should be
implemented by microcontroller firmware.



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