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MB3788
18
■
■■
■
APPLICATION CIRCUIT
+15 V
+24 V
DC motor 1
DC motor 2
24
150 Ω
23
20
21
22
1000 pF
Channel 1
(dB)
<Logic power supply>
(b)
22 µH
3 V
10 µF
Ca2
Cb2
OUT2
VE2
150 Ω
1000 pF
<Logic power supply>
+
(a)
22 µH
5 V
10 µF
Ca1
V
CC(out)
OUT1
VE1
2
3
5
1
4
Cb1
(15 mA)
Channel 2
(deg)
10 µH
+
-
33 µF
+
-
33 µF
V
CC
11
6
9
7
8
-IN1 (E)
FB1
-IN1 (C)
+IN1 (E)
V
CC
14
CTL2
13
CTL1
(a)
4.7 kΩ
4.7 kΩ
8.2 kΩ
2.7 kΩ
100 kΩ
19
16
18
17
-IN2 (E)
FB2
-IN2 (C)
+IN2 (E)
(b)
4.7 kΩ
4.7 kΩ
3.8 kΩ
2.7 kΩ
100 kΩ
15
10
12
GND-IN(PWM)SCPVREF
⇑
Triangular wave signal
1.9 V
1.3 V
CT
<MB3785A-used DC/DC converter>
<Analog power supply>
<Sensor power supply>
<DC motor speed control>
<DC motor speed control>
-
+
-
0.1 µF
0.22 µF
0.22 µF