DRV8434ESLASHP datasheet(20/48 Pages) TI

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7.3.3.3 Smart tune Dynamic Decay

The smart tune current regulation scheme is an advanced current-regulation control method compared to

traditional fixed off-time current regulation schemes. Smart tune current regulation scheme helps the stepper

motor driver adjust the decay scheme based on operating factors such as the ones listed as follows:

• Motor winding resistance and inductance

• Motor aging effects

• Motor dynamic speed and load

• Motor supply voltage variation

• Low-current versus high-current dI/dt

tBLANK

tOFF

tDRIVE

ITRIP

tBLANK

tDRIVE

tBLANK

tDRIVE

ITRIP

tBLANK

tDRIVE

tOFF

tBLANK

tDRIVE

tFAST

tOFF

tBLANK

tDRIVE

tFAST

Figure 7-7. Smart tune Dynamic Decay Mode

Smart tune Dynamic Decay greatly simplifies the decay mode selection by automatically configuring the decay

mode between slow, mixed, and fast decay. In mixed decay, smart tune dynamically adjusts the fast decay

percentage of the total mixed decay time. This feature eliminates motor tuning by automatically determining the

best decay setting that results in the lowest ripple for the motor.

The decay mode setting is optimized iteratively each PWM cycle. If the motor current overshoots the target trip

level, then the decay mode becomes more aggressive (add fast decay percentage) on the next cycle to prevent

regulation loss. If a long drive time must occur to reach the target trip level, the decay mode becomes less

aggressive (remove fast decay percentage) on the next cycle to operate with less ripple and more efficiently. On

falling steps, smart tune Dynamic Decay automatically switches to fast decay to reach the next step quickly.

Smart tune Dynamic Decay is optimal for applications that require minimal current ripple but want to maintain a

fixed frequency in the current regulation scheme.

DRV8434E

SLOSE49 – NOVEMBER 2020

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