LB1862

No. 6208-4/7

Block Diagram

Sample Application Circuit

(1) D1 is used to prevent IC destruction caused by reverse-connection. It can be omitted if no problems are expected.

(2) C2 would not be required for the internal fan PCB but required for the power supply line in order to reduce the

power line inpedance and pass the regenerative current because a motor is basically an inductive load and it has a

possibility of large current when the power is first applied or in other cases.

(3) When CT is not used, it should be connected to ground.

(4) When RD, ST, and HB are not used, they should be left open or connected to ground.

CT

VCC

0.47 to 1

µF

HALL

IN+

IN–

HB

Discharge

pulse

Thermal protection

circuit

Charge/discharge

circuit

Delay circuit

Delay circuit

Control

circuit

START/STOP

ST

GND

OUT1

OUT2

RD

M

A12478

Hysteresis amplifier

A12477

H

IN–

IN+

HB

ST

CT

GND

VCC

RD

OUT1

OUT2

C1=0.47 to 1

µF

C2

D1