RD022-RGUIDE-01-E
2019-Jan-15
Rev.1.0
28
/
31
© 2019
Toshiba Electronic Devices & Storage Corporation
Speed Control Part
Use a rail-to-rail Op-Amp.
LA
R4
R1
R2
R3
C1
R5
R6
Dif-in
Vreg
VSP
Figure 8-4 Speed Control Part
8.4.1. Parameter adjustment
R1 and R2:
if VSP=VMAX represents max speed, and LA=VLAMAX at max speed.
Adjust R1 and R2 so that
ܮܣܯܣܺ
=
ܸܯܣܺ
×
ܴ
2/(
ܴ
1+
ܴ
2)
R3: The factor of proportional control Kp is related to R3. Increase R3 to increase Kp.
C1: The factor of integral control Ki is related to C1. Increase C1 to increase Ki.
R5 and R6 :
Adjust R5 and R6 to ensure Dif-in will not exceed 3V.
If Dif-in=VMIN makes motor run at min speed, it is recommended to set R5 and R6 so that
ܯܫܰ
<5×
ܴ
6/(
ܴ
5+
ܴ
6)<3.
Total resistant of R5 and R6 should be around 50k to 100k.
