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DRV8889-Q1 Datasheet(PDF) 26 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) 26 Page - Texas Instruments

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7.3.6.3 Mode 4: Slow Decay for Increasing Current, Fast Decay for Decreasing current
tBLANK
tDRIVE
ITRIP
tOFF
tBLANK
tDRIVE
tOFF
tBLANK
tDRIVE
tOFF
tBLANK
tDRIVE
ITRIP
tBLANK
tDRIVE
tOFF
tBLANK
tDRIVE
Please note that these graphs are not the same scale; tOFF is the same
tOFF
Figure 7-10. Slow/Fast Decay Mode
During fast decay, the polarity of the H-bridge is reversed. The H-bridge will be turned off as current approaches
zero in order to prevent current flow in the reverse direction. In this mode, fast decay only occurs during
decreasing current. Slow decay is used for increasing current.
Fast decay exhibits the highest current ripple of the decay modes for a given tOFF. Transition time on decreasing
current steps is much faster than slow decay since the current is allowed to decrease much faster.
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
26
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Product Folder Links: DRV8889-Q1


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