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| 型号： | LB8109M |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.8 A, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 9/9页 |
| 文件大小： | 640K |
| 代理商： | LB8109M |
LB8109M
No. 5233-9/9
Supplementary Explanation
1. VCD supply
The VCD line is the power supply for the driver control blocks of channels 1 to 4. The VCD line can be supplied from the DSP
step-up circuit by using a coil with center tap (as shown in the Block Diagram).
However, because the allowable operating range for VCD is 3.6 V to 9.0 V, it is recommended that in order to reduce power
dissipation, the voltage should be set to the low end of this range. (Even if this power supply does not affect the control perfor-
mance such as the transfer gain.)
2. Sled step drive
Stepping control in this IC for the sled actuator is as described below. Normal V-type control is used if the SLMODE pin is set
high, but by setting this pin low it is possible to use step drive mode, which has a marked effect in reducing power dissipation.
(This only affects channel 4.)
The step drive starting level is input from the SLREF pin (only a voltage higher than ASPREF will be accepted), and the positive
side step start is determined by comparing the input voltage with IN4. For the negative side, the step start is determined automati-
cally by setting the differential voltage between the SLREF and the ASPREF on the opposite side, and then comparing that
voltage to IN4. In other words, the control characteristics become as defined by the solid line in the diagram below. (The rise on
the positive and negative steps has no hysteresis.)
Voltage between outputs
SLREF (greater than ASPREF)
If this voltage is set, the negative side step
start is determined automatically by setting the
differential voltage betwwen SLREF and
ASPREF on the opposite side as well.
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or 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.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be expor ted without obtaining the expor t license from the author ities
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 permission of SANYO Electric Co., Ltd.
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 product that you intend to use.
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.
This catalog provides information as of August, 1999. Specifications and information herein are subject to change
without notice.
PS
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