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DRV8889-Q1 Datasheet(PDF) 24 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) 24 Page - Texas Instruments

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7.3.6.1 Slow Decay for Increasing and Decreasing Current
t
BLANK
t
OFF
t
DRIVE
I
TRIP
t
BLANK
t
DRIVE
t
OFF
t
BLANK
t
DRIVE
t
BLANK
t
DRIVE
I
TRIP
t
BLANK
t
DRIVE
t
OFF
t
OFF
Figure 7-8. Slow/Slow Decay Mode
During slow decay, both of the low-side FETs of the H-bridge are turned on, allowing the current to be
recirculated.
Slow decay exhibits the least current ripple of the decay modes for a given tOFF. However on decreasing current
steps, slow decay will take a long time to settle to the new ITRIP level because the current decreases very slowly.
If the current at the end of the off time is above the ITRIP level, slow decay will be extended for another off time
duration and so on, till the current at the end of the off time is below ITRIP level.
In cases where current is held for a long time (no input in the STEP pin) or at very low stepping speeds, slow
decay may not properly regulate current because no back-EMF is present across the motor windings. In this
state, motor current can rise very quickly, and may require a large off-time. In some cases this may cause a loss
of current regulation, and a more aggressive decay mode is recommended.
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
www.ti.com
24
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