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DRV8889-Q1 Datasheet(PDF) 28 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) 28 Page - Texas Instruments

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7.3.6.5 Smart tune Dynamic Decay
The smart tune current regulation schemes are advanced current-regulation control methods compared to
traditional fixed off-time current regulation schemes. Smart tune current regulation schemes help the stepper
motor driver adjust the decay scheme based on operating factors such as the ones listed as follows:
• Motor winding resistance and inductance
• Motor aging effects
• Motor dynamic speed and load
• Motor supply voltage variation
• Motor back-EMF difference on rising and falling steps
• Step transitions
• Low-current versus high-current dI/dt
The device provides two different smart tune current regulation modes, named smart tune Dynamic Decay and
smart tune Ripple Control.
tBLANK
tOFF
tDRIVE
ITRIP
tBLANK
tDRIVE
tBLANK
tDRIVE
ITRIP
tBLANK
tDRIVE
tOFF
tOFF
tBLANK
tDRIVE
tFAST
tOFF
tBLANK
tDRIVE
tFAST
Figure 7-12. Smart tune Dynamic Decay Mode
Smart tune Dynamic Decay greatly simplifies the decay mode selection by automatically configuring the decay
mode between slow, mixed, and fast decay. In mixed decay, smart tune dynamically adjusts the fast decay
percentage of the total mixed decay time. This feature eliminates motor tuning by automatically determining the
best decay setting that results in the lowest ripple for the motor.
The decay mode setting is optimized iteratively each PWM cycle. If the motor current overshoots the target trip
level, then the decay mode becomes more aggressive (add fast decay percentage) on the next cycle to prevent
regulation loss. If a long drive time must occur to reach the target trip level, the decay mode becomes less
aggressive (remove fast decay percentage) on the next cycle to operate with less ripple and more efficiently. On
falling steps, smart tune Dynamic Decay automatically switches to fast decay to reach the next step quickly.
Smart tune Dynamic Decay is optimal for applications that require minimal current ripple but want to maintain a
fixed frequency in the current regulation scheme.
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
28
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Product Folder Links: DRV8889-Q1


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