L6482 datasheet(37/73 Pages) STMICROELECTRONICS

Part #	L6482

Description	cSPIN?? microstepping motor controller with motion engine and SPI

PDF	73 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 73 page

L6482

Phase current control

Doc ID 023768 Rev 2

37/73

Figure 19.

Adaptive decay - fast decay tuning

When two or more fast decays are performed with the present target current, the control

system adds a fast decay at the end of every off-time keeping the OFF state duration

constant (tOFF is split into tOFF, SLOW and tOFF, FAST). When the current threshold is

increased by a microstep change (rising step), the system returns to normal decay mode

(slow decay only) and the tFAST value is halved.

Stopping the motor or reaching the current sinewave zero crossing causes the current

control system to return to the reset state.

reference current

1st fast decay:

Tfast = TOFF_FAST/8

2nd fast decay (*):

Tfast = TOFF_FAST/4

(*)Note: starting from 2nd fast decay the system combines

fast and slow decay during the OFF phase.

3rd fast decay:

Tfast = TOFF_FAST/2

Ton > TON_MIN

Tfast = TOFF_FAST/2

AM15050v1

L6482 Datasheet(PDF) 37 Page - STMicroelectronics