Справочник Пользователя для Fujitsu MB3788

13

■

■

■

■

The output circuit is configured in a push-pull type as shown in Figure 1.  The ON current value of the output
current waveform shown in Figure 2 is a constant current and the OFF value set by RE is set by a time constant.
Each output current can be calculated from the following expression:
• ON current = 1.5/R

E

 (A) (Output current setting pin voltage: V

E

 

≈

 1.5 V)

• The OFF current time constant is proportional to the value of C

B

.

OFF current 

setting part

R

E

C

B

Drive Tr

OFF 

current

ON current

Output

current

0

ON current

OFF current

t

22 

µ

H

(5 V)

3

150 

Ω

1000 pF

4

5

1

V

CC

I

out

1000 pF

10 

µ

F

-IN1 (E)

8.2 k

Ω

-IN1 (C)

MB3788

2

Fig.1  Output Circuit Diagram

Fig.2  Output Current Waveform

Fig.4  Measurement Circuit Diagram

V

E

2.7 k

Ω

V

out