LB8503V Datasheet, PDF (15/20 Pages) Sanyo Semicon Device – Monolithic Digital IC DC Fan Motor Speed Control IC

LB8503V
Application Example 3
[Origin shift in the Y direction (the motor turns at 0%)]
(RPM)
Motor
full speed
0%
PWM Duty(%)
100%
12V
C4
C5
R3
C3
C6
C1
R4
R5
CTL
signal
LB8503V
VCC ^VREG
FGOUT
VREG
6VREG
EDGE
FG
One-shot
multivibrator
RC
FGIN
LIM
SOFT
CVI
CVO
VREF
VREG
EI
C2
EO1
C
CTL
CTL
GND
EO3
FG
VTH
When the speed control diagram origin is set so the motor turns at 0%, the CVO pin to ground potential difference is
resistor divided and the midpoint is input to the CVI pin.
The speed at 0% can be changed with the resistor ratio.
No.A0366-15/20