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DRV8461SPWPR bảng dữ liệu(PDF) 31 Page - Texas Instruments |
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DRV8461SPWPR bảng dữ liệu(HTML) 31 Page - Texas Instruments |
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31 / 117 page  7.3.9.1 Slow Decay t BLANK t OFF t DRIVE I TRIP t BLANK t DRIVE t OFF t BLANK t DRIVE t BLANK t DRIVE I TRIP t BLANK t DRIVE t OFF t OFF Figure 7-12. Slow Decay Mode During slow decay, both the low-side FETs of the H-bridge are turned on, allowing the current to be recirculated. Here are the points to consider when selecting slow decay mode - • Slow decay exhibits the least current ripple of the decay modes for a given tOFF. • However on decreasing current steps, slow decay will take a long time to settle to the new ITRIP level because the current decreases very slowly. – If the current at the end of the off time is above the ITRIP level, slow decay will be extended for another off time duration and so on, till the current at the end of the off time is below ITRIP level. • In cases where current is held at the same level for a long time (no STEP input), or the target regulation current level is low, or at very low stepping speeds, slow decay may not properly regulate current because the back-EMF across the motor windings may be very small to discharge the current during the off time. In this state, motor current can rise very quickly, and may require a large off time. In some cases this may cause a loss of current regulation, and a more aggressive decay mode is recommended. www.ti.com DRV8461 SLOSE98 – DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 31 Product Folder Links: DRV8461 |
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