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DRV8307RHAT 数据表(PDF) 21 Page - Texas Instruments

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部件名 DRV8307RHAT
功能描述  Brushless DC Motor Controller
Download  33 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

DRV8307RHAT 数据表(HTML) 21 Page - Texas Instruments

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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.


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