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DRV8889-Q1 Datasheet(PDF) 29 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) 29 Page - Texas Instruments

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7.3.6.6 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 7-13. Smart tune Ripple Control Decay Mode
Smart tune Ripple Control operates by setting an IVALLEY level alongside 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. Slow decay operates similar to mode 1 in which both low-side MOSFETs are turned on allowing the
current to recirculate. In this mode, tOFF varies depending on the current level and operating conditions.
This method allows much tighter regulation of the current level increasing motor efficiency and system
performance. Smart tune Ripple Control can be used in systems that can tolerate a variable off-time regulation
scheme to achieve small current ripple in the current regulation.
www.ti.com
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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