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DRV8307RHAT 数据表(PDF) 21 Page - Texas Instruments |
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DRV8307RHAT 数据表(HTML) 21 Page - Texas Instruments |
21 / 33 page 21 DRV8307 www.ti.com SLVSCK2A – APRIL 2014 – REVISED FEBRUARY 2016 Product Folder Links: DRV8307 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated Application Information (continued) 8.1.2 ENABLEn Considerations Because the ENABLEn function doubles as a sleep (low-power shutdown) function, there are some important considerations when asserting and deasserting ENABLEn. While the motor driver is enabled, the deassertion of ENABLEn initiates a stop-and-power-down sequence. This sequence starts by disabling the motor (coasting) and waiting for rotation to stop. After rotation is stopped for 1 s (as determined by the absence of transitions on HALLOUT), the internal circuitry is powered-down, the V5 regulator and power switch are disabled, and internal clocks are stopped. After this stop-and-power-down sequence has been initiated (by deasserting the ENABLEn terminal for at least 1.2 μs), the sequence continues to completion, regardless of the state of ENABLEn. 8.1.3 Faster Starting and Stopping When the DRV8307 is spinning a motor and ENABLEn is brought high while BRAKE is left low, the external MOSFETs is disabled and the motor coasts to a stop. The motor cannot be re-driven until it first completely stops. For more dynamic performance, the ENABLEn and BRAKE inputs can be tied together. Then when the motor is disabled (by bringing ENABLEn high), BRAKE is also high, causing the low-side of each half-H bridge to be on. This causes the motor to stop faster, and allows it to be re-driven sooner. |
类似零件编号 - DRV8307RHAT |
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类似说明 - DRV8307RHAT |
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