LB11820 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LB11820

Direct PWM Drive Brushless Pre-Driver for Household Appliance Motors

SANYO -> Panasonic 

LB11820M

12. Forward/Reverse Rotation

To select forward or reverse in the rotation condition, a measure is taken to prevent flow of the through current

(through current due to the output Tr OFF delay time at selection) at the output. Selection during rotation causes the

current exceeding the current limit value to flow through the output Tr because of the motor coil resistance and motor

reverse electromotive voltage condition. It is therefore necessary to select the external output Tr that is not damaged

by this current or to select forward/reverse only when the motor rotation speed has decreased to a certain level.

13. Brake operation

Braking is made by setting the BR pin to the L level. Braking consists of a short-circuit brake condition in which all

of one-side outputs (UH, VH, or WH) are turned ON while other outputs (UL, VL, WL) are turned OFF. A measure

is taken to prevent flow of through current (through current due to output Tr OFF delay time at selection) when the

brake is operated or cancelled. While braking is made, current limiting and motor lock protection circuits are not

operative.

Short-circuit braking causes large current to flow through the output Tr because of motor coil resistance and the motor

reverse electromotive voltage condition during operation. It is therefore necessary to select the external output Tr that is

not damaged by this current or to activate braking only when the motor rotation speed has decreased to a certain level.

14. Power Supply Stabilization

This IC is of a switching drive type and the power line tends to be affected. It is therefore necessary to connect a

capacitor of sufficient capacity for stabilization between the VCC1 pin and GND.

To insert a diode in the power line to prevent breakdown through reverse connection of power supply, the power line

becomes more readily affected. It is necessary to select a larger capacity.

To turn ON/OFF the power supply with a switch, etc., large distance between the switch and capacitor causes

substantial deviation of the supply voltage due to the line inductance and inrush current into the capacitor. In certain

cases, the withstand voltage may be exceeded. In this case, do not use a ceramic capacitor whose series impedance is

low. Instead, use an electrolytic capacitor to suppress the inrush current and to prevent voltage rise.

15. VREG Stabilization

To stabilize the VREG voltage that is the power supply for the control circuit, connect a 0.1 µF or more capacitor between

VREG and GND. The capacitor GND must be wired near the GND pin of IC as much as possible.

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 June, 2002. Specifications and information herein are subject to

change without notice.

PS No. 7104-17/17

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