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DRV8426PWPR Datasheet(PDF) 23 Page - Texas Instruments

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Part # DRV8426PWPR
Description  DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology
PDF  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DRV8426PWPR Datasheet(HTML) 23 Page - Texas Instruments

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DRV8426
www.ti.com
SLOSE55 – MAY 2020
Product Folder Links: DRV8426
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Copyright © 2020, Texas Instruments Incorporated
7.3.6.5 Smart tune Ripple Control
Figure 14. 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.
The ripple current in this decay mode is programmed by the TOFF pin. The ripple current is dependent on the
ITRIP of a particular microstep level.
Table 9. Current Ripple Settings
TOFF
Current Ripple at a specific microstep level
0
11mA + 1% of ITRIP
1
11mA + 2% of ITRIP
Hi-Z
11mA + 4% of ITRIP
330k
Ω to GND
11mA + 6% of ITRIP
The ripple control 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. Select a low ripple current setting to
ensure that the PWM frequency is not in the audible range.
7.3.6.6 PWM OFF Time
The TOFF pin configures the PWM OFF time, as shown in Table 8. The OFF time settings can be changed on
the fly. After a OFF time setting change, the new OFF time is applied after a 10 µs de-glitch time.



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