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DRV8428DYYR Datasheet(PDF) 21 Page - Texas Instruments

Part # DRV8428DYYR
Description  DRV8428 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology
PDF  53 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DRV8428DYYR Datasheet(HTML) 21 Page - Texas Instruments

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BLANK
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DRIVE
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DRV8428
www.ti.com
SLOSE54 – JUNE 2020
Product Folder Links: DRV8428
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Copyright © 2020, Texas Instruments Incorporated
7.3.5.3 Smart tune Ripple Control
Figure 11. 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.
The ripple current in this decay mode is 7.5mA + 1% of the ITRIP at a specific microstep level.
7.3.5.4 Blanking time
After the current is enabled (start of drive phase) in an H-bridge, the current sense comparator is ignored for a
period of time (tBLANK) before enabling the current-sense circuitry. The blanking time also sets the minimum drive
time of the PWM. The blanking time is approximately 1 µs.



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