LB1663, 1663M, 1666

PS No.2552-5/5

SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using

products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition

ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.

products described or contained herein.

SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all

semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or

malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise

to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt

safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not

limited to protective circuits and error prevention circuits for safe design, redundant design, and structural

design.

Upon using the technical information or products described herein, neither warranty nor license shall be granted

with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third

party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's

intellctual property rights which has resulted from the use of the technical information and products mentioned

above.

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

for volume production.

Any and all information described or contained herein are subject to change without notice due to

product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the

SANYO Semiconductor Co.,Ltd. product that you intend to use.

In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are

controlled under any of applicable local export control laws and regulations, such products may require the

export license from the authorities concerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,

without the prior written consent of SANYO Semiconductor Co.,Ltd.

Automatic return circuit C pin voltage

1) When a fan is rotating, the capacitor is charged at 3

μA (typ) and discharged through the C with pulses according to

the rotational speed.

2) When a fan is locked, no discharge occurs through the C and the C voltage rises, turning OFF the output at 0.8

×

VIN.

3) When the output is turned OFF, discharge occurs through the C at 0.44

μA (typ). If the lock is not released when the

C voltage drops to VTH2, the capacitor is charged to VTH1 again. (At this moment, the output is turned ON.)

These operations 2), 3) repeated on a cycle of approximately ton : toff = 1 : 6 protect a motor.

4) If the lock is released when the C voltage drops to VTH2, the output is turned ON, starting rotation.

This catalog provides information as of December, 2008. Specifications and information herein are subject

to change without notice.

0

1

2

3

4

5

6

VTH2

VTH1

01

t3

23456789

10

11

12

13

14

15

16

17

t2

t1

1

t (s)

Output on

Lock

Output off

Output

on

Rotation

Rotation

Lock released

2

Output off