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| 型号： | LB1816 |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封装： | 0.500 INCH, DIP-28 |
| 文件页数： | 8/8页 |
| 文件大小： | 98K |
| 代理商： | LB1816 |
LB1816
No.4626-8/8
5. Start and brake
When driving motors such as optical disc spindle motors, stopping is performed by applying some form of braking.
In these applications it is necessary for the motor to decelerate briefly and come to a complete stop. This IC performs
the following braking operation in order to meet these requirements.
Braking operation
This braking circuit applies full torque reverse rotation braking (in the current limited state) directly after the S/B
pin is set high while the motor is running. After that, the reverse torque is gradually decreased (according to the
time constant determined by R10 and C12) at the points where the speed falls below the values listed below. This
operation brings the disc to a full stop.
f3H = fFG/32 (FG mode) where
f3H: Triple Hall input composite frequency
fFG: FG frequency when locked
Depending on the size of the disc and the motor torque, the following adjustments may be required to improve the
disc stopping characteristics.(Connect R10 and C12 with an appropriate value, and experiment.)
Increase the time constants if the motor continues to rotate in the forward direction after the braking torque has gone
to zero.
Decrease the time constant if the motor is observed to rotate in the reverse direction due to the braking operation.
A value of about 51kΩ is recommended for R10. In particular, it should be under 100kΩ
The brake circuit comes with a power-on-reset function. Even when an instantaneous power failure has occurred
while braking operation, it will continue the braking operation as soon as power is restored.
6. When power is on
When the power is turned on, a phenomenon where the disc rotates slightly, even while the S/B pin is set to high may
be observed (depending on the power supply startup speed). If this poses a problem, the situation can be improved by
connecting R1 and C3 (which need not be connected if no problem is posed). The motor will not run if the S/B pin is
kept low when the power is turned on. It will run if the S/B pin is first set high and then set low.
This catalog provides information as of March, 2007. Specifications and information herein are subject
to change without notice.
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.
PS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1817M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:FDD Spindle Motor Driver |
| LB1817W | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC Motor Controller/Driver |
| LB1820 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Office Automation-Use 3-Phase Brushless Motor Driver |
| LB1821 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Power Brushless Motor Pre-Driver IC for OA Equipment |
| LB1821M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Power Brushless Motor Pre-Driver IC for OA Equipment |
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