Fujitsu MB3788 manual Application Circuit, SCP Inpwm GND

MB3788

■ APPLICATION CIRCUIT

10 ∝H

VCC

+

+

-

∝F

-

33

∝F

33

13

14

11

CTL1

CTL2

VCC

4.7 kΩ

+IN1 (E)

Cb1

<Logic power supply>

8

4

4.7 kΩ

1000 pF

(a)

(a)

8.2 kΩ

Channel 1

Ca1

5

7

-IN1 (E)

22

∝

5 V

(dB)

VCC(out)

1

H

100 kΩ

2.7 kΩ 0.22 ∝F

FB1

OUT1

+

∝

F

6

2

-

10

VE1

150 Ω

(15 mA)

9

-IN1 (C)

3

4.7 kΩ

<Logic power supply>

+IN2 (E)

17

(b)

20

4.7 kΩ

Ca2

(b)

3.8 k

Ω

1000 pF

22

∝

3 V

18

-IN2 (E)

Cb2

21

H

Channel 2

100 kΩ

+

(deg)

2.7 kΩ

0.22 ∝F

FB2

OUT2

23

-

10 ∝F

19

150 Ω

VE2 22

16

-IN2 (C)

VREF

SCP

-IN(PWM)

GND

12

15

10

24

0.1 ∝F

⇑

Triangular wave signal

1.9 V

1.3 V

CT

<Analog power supply>

+15 V

<Sensor power supply>

+24 V

<MB3785A-used DC/DC converter>

<DC motor speed control>

DC motor 1

<DC motor speed control>

DC motor 2

18