No. 5687-10/11

LB1924

Continued from preceding page.

Pin No.

Pin

Pin function

Equivalent circuit

14

Speed discriminator output.

High: Acceleration

Low: Deceleration

15

LD

Speed lock detection output

Outputs a low level when the motor speed is in the lock range

(±6.25%).

16

FG amplifier output

17

FG amplifier input

18

FG amplifier input (bias input).

The logic block initial reset is applied by connecting a

19

CROCK

Setting for the lock protection circuit operating time.

An operating time of about 2.5 seconds can be set by

connecting a capacitor of about 0.047 µF between the

CROCK pin and ground.

Continued on next page.

FG Schmitt comparator

FG reset circuit