LB11946 Datasheet, PDF (10/14 Pages) Sanyo Semicon Device – PWM Current Control Stepping Motor Driver

LB11946
SLOW DECAY Current Path
The reregenerative current at upper-side transistor switching operates
Current path at output ON
Regenerative current
at upper-side transistor OFF
Motor current I
I = VE/Re
OUTA
ON
constant
I
SBD
SBD
ON
OFF
OUTA
VBB
Output OFF
VE
Sensing voltage comparator
VREF
Re
VREF
Internal reference voltage
3.04 _{by setting voltage circuit}
Fig.1
FAST DECAY Current Path
Current path at output ON
Current path at Fast DECAY
OUTA
ON
OFF
SBD
SBD
ON
OFF
OUTA
VBB
VE
Sensing voltage comparator
VREF
Re
VREF
3.04
Fig.2
No.7946-10/14