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DRV8889-Q1 Datasheet(PDF) 27 Page - Texas Instruments

Part No. DRV8889-Q1
Description  DRV8889-Q1, DRV8889A-Q1 Automotive Stepper Driver with Integrated Current Sense, 1/256 Micro-Stepping, and Stall Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DRV8889-Q1 Datasheet(HTML) 27 Page - Texas Instruments

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7.3.6.4 Mixed Decay for Increasing and Decreasing Current
ITRIP
tBLANK
tDRIVE
ITRIP
tBLANK
tDRIVE
tDRIVE
tOFF
tBLANK
tDRIVE
tFAST
tBLANK
tOFF
tFAST
tDRIVE
tOFF
tOFF
Figure 7-11. 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.
www.ti.com
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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