No. 4943-5/5

LB1863M, 1869M

4. Output protection function (C pin)

This pin connects the capacitor that forms the automatic recovery circuit. If rotation stops due to, for example, a

motor overload, the pin voltage rises and the output stops. The system automatically recovers from stopped to drive

mode when the load is set to an appropriate level. The lock detection time can be set by changing the value of the

capacitor.

For a 1-µF capacitor:Lock detection time

About 2 seconds

Lock protection time (output on)

About 1 second

(output off) About 6 seconds

This catalog provides information as of January, 1997. Specifications and information herein are subject to

change without notice.

s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace

equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of

which may directly or indirectly cause injury, death or property loss.

s Anyone purchasing any products described or contained herein for an above-mentioned use shall:

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all

damages, cost and expenses associated with such use:

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees

jointly or severally.

s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for

volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied

regarding its use or any infringements of intellectual property rights or other rights of third parties.

ŒWhile the blades are turning, the capacitor is charged with a current of about 3 µA (typical), and C is discharged by

pulses that correspond to the motor speed.

When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The

output is turned off when that voltage reaches 0.8

× V

ŽWhen the output is turned off, the capacitor is discharged at a current of about 0.44 µA (typical). When the

ton:toff ratio of about 1:6 to protect the motor.

{If the lock state has been cleared when the capacitor voltage reaches V

output on.

5. Rotation detection signal (RD pin)

This is an open collector output, and outputs a low level in drive mode and a high level when the motor is stopped.

6. Radio-frequency noise reduction function (B1 and B2 pins)

These are base pins for Darlington pair outputs. Add capacitors of about 0.01 to 0.1 µF if radio-frequency noise is a

problem.

7. Thermal shutdown function

Turns off the output in response to coil shorting or IC overheating.

Automatic recovery circuit pin C voltage