DRV8426PWPR datasheet(21/49 Pages) TI1

Part #	DRV8426PWPR

Description	DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology

PDF	49 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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21 / 49 page

ITRIP

tBLANK

tDRIVE

ITRIP

tBLANK

tDRIVE

tOFF

tBLANK

tDRIVE

tFAST

tBLANK

tOFF

tFAST

tDRIVE

tOFF

DRV8426

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SLOSE55 – MAY 2020

Product Folder Links: DRV8426

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7.3.6.3 Mixed Decay for Increasing and Decreasing Current

Figure 12. Mixed-Mixed Decay Mode

Mixed decay begins as fast decay for a time, followed by slow decay for the remainder of tOFF. In this mode,

mixed decay occurs for both increasing and decreasing current steps.

This mode exhibits ripple larger than slow decay, but smaller than fast decay. On decreasing current steps,

mixed decay settles to the new ITRIP level faster than slow decay.

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 requires an excessively large off-time. Increasing or decreasing

mixed decay mode allows the current level to stay in regulation when no back-EMF is present across the motor

windings.

DRV8426PWPR Datasheet(PDF) 21 Page - Texas Instruments