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DRV8461SPWPR 数据表(PDF) 46 Page - Texas Instruments

部件名 DRV8461SPWPR
功能描述  DRV8461: 65 V, 3 A Stepper Motor Driver for High Efficiency and Noiseless Operation
PDF  117 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

DRV8461SPWPR 数据表(HTML) 46 Page - Texas Instruments

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Figure 7-25. Auto-torque learning
Figure 7-25 shows an automatic learning process with 740 mA initial current (IFS1) and 2.2 A final current (IFS2).
The ATQ_LEARN_CYCLE_SELECT corresponds to 32 half-cycles.
7.3.12.2 Current Control Loop
Table 7-24 lists the registers associated with current control.
Table 7-24. Registers for Current Control
Parameter
Description
ATQ_UL[7:0]
ATQ_LL[7:0]
Upper and lower boundaries of the hysteretic band within which ATQ_CNT is controlled by
modifying the motor current.
ATQ_TRQ_MIN[7:0]
ATQ_TRQ_MAX[7:0]
Programmable minimum and maximum current limit when auto-torque is enabled.
ATQ_TRQ_DAC[7:0]
Outputs the value of motor current when auto-torque is enabled. ATQ_TRQ_DAC can vary
between ATQ_TRQ_MIN and ATQ_TRQ_MAX.
CNT_OFLW
The CNT_OFLW flag becomes 1b if ATQ_CNT is more than ATQ_UL.
CNT_UFLW
the CNT_UFLW flag becomes 1b if ATQ_CNT is less than ATQ_LL.
The ATQ_CNT parameter is proportional to the load torque and inversely proportional to the current setting of
the stepper driver. An idealized representation of this relation is shown in Figure 7-26 -
DRV8461
SLOSE98 – DECEMBER 2022
www.ti.com
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