Truth Table

IN+

IN–

C

OUT1

OUT2

HL

L

H

L

LH

L

L

H

HL

H

H

H

L

HHH

H

Output Protection

For C marked with 1 µF

Lock detect time

Approximately 2s

Lock protect time

(output on)

Approximately 1s

Lock protect time

(output off)

Approximately 6s

Pin Description

Pin Name

Function

which generates a voltage (6.7 V) on this pin and supplies a regulated voltage to the IC system and a Hall

element.

IN+

IN–

Pins for accepting output from Hall element.

Offset voltage:

± 7mV

OUT1

OUT2

Output transistors of output pins are Darlington-connected. External capacitors or Zener diodes must be

connected to protect output transistors.

RD

Open collector output (Drive mode - ‘‘L’’, Stop mode - ‘‘H’’)

B1

B2

Base pins for output transistors of Darlington connection.

A capacitor must be connected in an application where radio noise becomes a problem.

C

Capacitor pin for automatic return function

When the rotation is stopped by an overload, the voltage on this pin is increased, turning OFF the output.

Automatic return from output ‘‘stop’’ to ‘‘drive’’ occurs by making the load proper. The lock detect time can be set

by changing the capacitor constant.

GND

Ground

Pd max – Ta

Ambient temperature, Ta – °C

LB1663, 1663M, 1666

No. 2552- 5/6