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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) 34 Page - Texas Instruments |
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DRV8461SPWPR датащи(HTML) 34 Page - Texas Instruments |
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34 / 117 page  7.3.9.4 Smart tune Ripple Control t BLANK t OFF t DRIVE I TRIP t BLANK t DRIVE t OFF t BLANK t DRIVE I TRIP t BLANK t DRIVE t OFF I VALLEY t OFF t OFF t BLANK t DRIVE t BLANK t DRIVE I VALLEY t BLANK t DRIVE t OFF Figure 7-15. Smart tune Ripple Control Decay Mode In smart tune Ripple Control decay mode, the PWM off time is variable depending on the current level and operating parameters. It operates by setting an IVALLEY level along with the ITRIP level. When the current level reaches ITRIP, instead of entering slow decay until the tOFF time expires, the driver enters slow decay until IVALLEY is reached. The magnitude of the ripple current in smart tune ripple control mode is programmed by the RC_RIPPLE[1:0] bits or the TOFF pin, as shown in Table 7-19. Table 7-19. Current Ripple Settings H/W Interface SPI Interface Current Ripple at a specific microstep level TOFF RC_RIPPLE 0 00b (default) 15 mA + 1% of ITRIP 1 01b 15 mA + 2% of ITRIP Hi-Z 10b 15 mA + 4% of ITRIP 330kΩ to GND 11b 15 mA + 6% of ITRIP The smart tune ripple control scheme allows much tighter regulation of the ripple current, thereby improving motor efficiency and reducing audible noise. Select a ripple current setting that ensures the PWM frequency is not in the audible range (< 20 kHz). 7.3.9.5 PWM OFF Time The TOFF bits or the TOFF pin configure the PWM OFF time for all decay modes, except smart tune ripple control and silent step decay modes, as shown in Table 7-20. The OFF time settings can be changed on-the-fly. DRV8461 SLOSE98 – DECEMBER 2022 www.ti.com 34 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRV8461 |
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