LB11873 Datasheet, PDF (5/14 Pages) Sanyo Semicon Device – Monolithic Digital IC For Polygonal Mirror Motors Three-Phase Brushless Motor Driver

Pin Assignment
LB11873
36 35 34 33 32 31 30 29 28
27 26 25 24 23 22 21 20 19
LB11873
123456789
10 11 12 13 14 15 16 17 18
Hall sensor input waveforms and output current waveform
(1) When the Hall sensor input amplitude is small or when the input waveform slope is low
High
IN1
Low
IN2
IN3
IOUT1
IOUT2
Source
Sink
IOUT3
Top view
180° drive: Current flows during all periods; there are on off periods (180° drive)
(2) When the Hall sensor input amplitude is larger or when the input waveform slope is steep
High
IN1
Low
IN2
IN3
IOUT1
IOUT2
Source
Sink
IOUT3
In this case, periods in which drive is off will occur (the off periods vary depending on the Hall sensor inputs).
No.A0081-5/14