LB1947 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1947

PWM Current Control Type Bidirectional Motor Driver

SANYO -> Panasonic 

Notes on Usage

LB1947

1. VREF pin

Because the VREF pin serves for input of the set current reference voltage, precautions against noise must be taken.

2. GND pin

The ground circuit for this IC must be designed so as to allow for high-current switching. Blocks where high current

flows must use low-impedance patterns and must be removed from small-signal lines. Especially the ground

connection for the sensing resistor RE at pin E, and the ground connection for the Schottky barrier diodes should be in

close proximity to the IC ground.

The capacitors between VCC and ground, and VBB and ground should be placed close to the VCC and VBB pins,

respectively.

3. CR pin setting (Switching off time, Noise cancel time)

The noise cancel time (Tn) and the switching off time (Toff) are set by the following expressions:

Noise cancel time: Tn ≈ C × R × ln {(1.0 − RI) / (4.0 − RI) [sec]

CR charge current: 1.3mA

Switching off time: Toff ≈ −C × R × ln (1.0 / 4.8) [sec]

Internal configuration at CR pin

VCC line

One-shot multi-blanking

time circuit

E1

C:1000pF

R:5.1kΩ

CR constant range: R = 4.7k to 100kΩ

C = 330pF to 2200pF

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.

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.

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.

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

for volume production.

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.

This catalog provides information as of February, 2009. Specifications and information herein are subject

to change without notice.

PS No.6192-9/9

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