LB1928(1999) Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LB1928
(Rev.:1999)

Three-Phase Brushless Motor Driver for Office Automation Equipment

SANYO -> Panasonic 

LB1928

10. Motor restraint protection circuit

To protect the IC and the motor itself when rotation is inhibited, a restraint protection circuit is provided. If the LD

output is High (unlocked) for a certain interval in the start condition, the lower-side transistors are turned off. The

length of the interval is determined by the capacitance at the CSD pin. A capacitance of 10 µF results in a set

interval of about 3.3 seconds. (Tolerance approx. ±30%)

Set interval (s) =.. 0.33 × C (µF)

If the capacitor arrangement is subject to leak current, possible adverse effects such as setting time tolerances must

be taken into consideration.

When the restraint protection circuit has been activated, the condition can only be canceled by setting the system to

the stop condition or by turning the power off and on again (in the stop condition). When wishing not to use the

restraint protection circuit, connect the CSD pin to ground.

If the stop time when releasing the restraint protection is short, the capacitor charge will not be fully dissipated.

This in turn will cause a shorter restraint protection activation time after the motor has been restarted. The stop time

should therefore be designed to be sufficiently long, using the equation shown below (also when restarting in the

motor start transient state).

Stop time (ms) ≥ 15 × C (µF)

11. Power supply regulation

Because this IC has a high output current, power supply line fluctuations can occur easily. Therefore a capacitor of

sufficient capacitance must be connected between the VCC pin and ground to assure stable operation. If a diode is

used in the power line for reverse-connection protection, the likelihood of power line fluctuations increases further,

which will require more capacitance.

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 exported without obtaining 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 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 December, 1999. Specifications and information herein are subject to change

without notice.

PS No. 6198-11/11

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