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| DRV8880_15 Datasheet, PDF (24/48 Pages) Texas Instruments – DRV8880 2-A Stepper Motor Driver With AutoTune™ | |||
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DRV8880
SLVSD18A â JUNE 2015 â REVISED JULY 2015
7.3.5.4 Mode 4: Slow Decay for Increasing Current, Fast Decay for Decreasing current
ITRIP
www.ti.com
tBLANK
tDRIVE
tOFF
tBLANK
tDRIVE
tOFF
Please note that these graphs are not the same scale; tOFF is the same
tBLANK
tDRIVE
ITRIP
tBLANK
tDRIVE
tOFF
tBLANK
tDRIVE
tOFF
Figure 19. Slow/Fast Decay Mode
tBLANK
tDRIVE
tOFF
During fast decay, the polarity of the H-bridge is reversed. The H-bridge will be turned off as current approaches
zero in order to prevent current flow in the reverse direction. In this mode, fast decay only occurs during
decreasing current. Slow decay is used for increasing current.
Fast decay exhibits the highest current ripple of the decay modes for a given tOFF. Transition time on decreasing
current steps is much faster than slow decay since the current is allowed to decrease much faster.
24
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