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L6480 데이터시트(PDF) 21 Page - STMicroelectronics

부품명 L6480
상세설명  The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping.
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L6480 데이터시트(HTML) 21 Page - STMicroelectronics

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L6480
Functional description
Doc ID 023278 Rev 3
21/73
6.4.1
Automatic Full-step and Boost modes
When motor speed is greater than a programmable full-step speed threshold, the L6480
switches automatically to Full-step mode; the driving mode returns to microstepping when
motor speed decreases below the full-step speed threshold.
The switching between the microstepping and Full-step mode and vice-versa is always
performed at an electrical position multiple of
π/4 (Figure 6 and Figure 7).
Full-step speed threshold is set through the related parameter in the FS_SPD register
(Section 9.1.9).
When the BOOST_MODE bit of the FS_SPD register is low (default), the amplitude of the
voltage squarewave in Full-step mode is equal to the peak of the voltage sinewave multiplied
by sine(
π/4) (Figure 6). This avoids the current drop between the two driving modes.
When the BOOST_MODE bit of the FS_SPD register is high, the amplitude of the voltage
squarewave in Full-step mode is equal to the peak of the voltage sinewave (Figure 7). That
improves the output current increasing the maximum motor torque.
Figure 6.
Automatic Full-step switching in Normal mode
Phase A
Phase B
(2N+1) x
π /4
(2N+1) x
π /4
Full-Step
Microstepping
Microstepping
V
peak
sin(
π /4)x V
peak
AM12829v1



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