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DRV8426PWPR Scheda tecnica(PDF) 21 Page - Texas Instruments |
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DRV8426PWPR Scheda tecnica(HTML) 21 Page - Texas Instruments |
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21 / 49 page ![]() ITRIP tBLANK tDRIVE ITRIP tBLANK tDRIVE tDRIVE tOFF tBLANK tDRIVE tFAST tBLANK tOFF tFAST tDRIVE tOFF tOFF 21 DRV8426 www.ti.com SLOSE55 – MAY 2020 Product Folder Links: DRV8426 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated 7.3.6.3 Mixed Decay for Increasing and Decreasing Current Figure 12. Mixed-Mixed Decay Mode Mixed decay begins as fast decay for a time, followed by slow decay for the remainder of tOFF. In this mode, mixed decay occurs for both increasing and decreasing current steps. This mode exhibits ripple larger than slow decay, but smaller than fast decay. On decreasing current steps, mixed decay settles to the new ITRIP level faster than slow decay. In cases where current is held for a long time (no input in the STEP pin) or at very low stepping speeds, slow decay may not properly regulate current because no back-EMF is present across the motor windings. In this state, motor current can rise very quickly, and requires an excessively large off-time. Increasing or decreasing mixed decay mode allows the current level to stay in regulation when no back-EMF is present across the motor windings. |
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