lv8732v ON Semiconductor, lv8732v Datasheet - Page 17

• Manufacturer Part Number: lv8732v
• Description: Bi-cmos Lsi Pwm Constant-current Control Stepping Motor Driver
• Manufacturer: ON Semiconductor

(12) Current control operation specification
In each current mode, the operation sequence is as described below :
Above operations are repeated. Normally, the SLOW (+FAST) DECAY mode continues in the sine wave increasing
direction, then entering the FAST DECAY mode till the current is attenuated to the set level and followed by the SLOW
DECAY mode.
• At rise of chopping frequency, the CHARGE mode begins. (In the time defined as the “blanking time,” the CHARGE
• The coil current (ICOIL) and set current (IREF) are compared in this blanking time.
(Sine wave decreasing direction)
(Sine wave increasing direction)
STEP
Coil current
fchop
Current mode
STEP
Coil current
fchop
Current mode
mode is forced regardless of the magnitude of the coil current (ICOIL) and set current (IREF).)
When (ICOIL < IREF) state exists ;
When (ICOIL < IREF) state does not exist ;
Set current
The CHARGE mode up to ICOIL ≥ IREF, then followed by changeover to the SLOW DECAY mode, and
finally by the FAST DECAY mode for approximately 1μs.
The FAST DECAY mode begins. The coil current is attenuated in the FAST DECAY mode till one cycle of
chopping is over.
CHARGE
CHARGE
Forced CHARGE
section
Forced CHARGE
section
SLOW
SLOW
Set current
FAST
FAST
LV8732V
Set current
Set current
Forced CHARGE
section
CHARGE
SLOW
FAST
FAST
CHARGE
SLOW
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