LB1938FA

No.A2041-3/5

Pin Assignment

S-GND: GND for the control system

P-GND: GND for the power system

Truth Table

IN1

IN2

OUT1

OUT2

Mode

L

L

OFF

OFF

Standby

H

L

H

L

Forward rotation

L

H

L

H

Reverse rotation

H

H

H

H

Brake

Sample Application Circuit

Cautions:

• VCC and GND lines suffer substantial fluctuation in the current quantity, causing a problem of line oscillation in

certain cases. In this case, take following points into account:

(1) Use a thick and short wiring to reduce the wiring inductance.

(2) Insert a capacitor with satisfactory frequency characteristics near IC.

(3) Connect S-GND to the control system GND on the CPU side and P-GND to the power system GND.

VCC 1

2

3

4

8

7

6

5

IN1

IN2

S-GND

P-GND

OUT1

OUT2

NC

Top view

LB1938FA

VCC

OUT1

IN1

OUT2

IN2

P-GND

S-GND

M

CPU

6

7

1

2

3

4

8