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L6480 データシート(PDF) 39 Page - STMicroelectronics |
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L6480 データシート(HTML) 39 Page - STMicroelectronics |
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39 / 73 page  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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