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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DRV8461SPWPR датащи(PDF) 32 Page - Texas Instruments |
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DRV8461SPWPR датащи(HTML) 32 Page - Texas Instruments |
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32 / 117 page  7.3.9.2 Mixed Decay ITRIP tBLANK tDRIVE ITRIP tBLANK tDRIVE tDRIVE tOFF tBLANK tDRIVE tFAST tBLANK tOFF tFAST tDRIVE tOFF tOFF Figure 7-13. Mixed Decay Mode Mixed decay begins as fast decay for a fixed initial duration of the tOFF time (30% or 60%), followed by slow decay for the remainder of tOFF time. Following points should be considered when selecting mixed decay mode - • This mode exhibits ripple larger than slow decay. • On decreasing current steps, mixed decay settles to the new ITRIP level faster than slow decay. • In cases where current is held at the same level for a long time (no STEP input), or at very low stepping speeds, mixed decay allows the current to stay in regulation when no back-EMF is present across the motor windings. • Fixed 30% or 60% mixed decay schemes can result in repeated patterns in current regulation that fall in the audible frequency range, resulting in a noisy motor operation. 7.3.9.3 Smart tune Dynamic Decay The smart tunes are advanced current regulation schemes compared to traditional mixed decay modes. Smart tune helps the stepper motor driver adjust the decay scheme based on changes in operating factors such as: • Motor winding resistance and inductance • Motor aging • Motor dynamic speed and load • Motor supply voltage variation • Motor back-EMF difference on rising and falling steps • Step transitions • Low-current versus high-current dI/dt The DRV8461 supports two different smart tune schemes - smart tune Dynamic Decay and smart tune Ripple Control. DRV8461 SLOSE98 – DECEMBER 2022 www.ti.com 32 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRV8461 |
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