LB1975 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1975

3-phase Brushless Motor Driver

SANYO -> Panasonic 

LB1975

13. Sample calculation for internal power dissipation (approximate)

The calculation assumes the following parameters:

VCC = 5V

VM = 30V

Source-side output transistor ON duty cycle 80% (PWM control)

Output current IO = 1A (RF pin average current)

(1) ICC power dissipation P1

P1 = VCC × ICC = 5V × 14mA = 0.07W

(2) Output drive current power dissipation P2

P2 = VM × 11mA = 30V × 11mA = 0.33W

(3) Source-side output transistor power dissipation P3

P3 = VO(source) × IO × Duty(on) = 0.9V × 1A × 0.8 = 0.72W

(4) Sink-side output transistor power dissipation P4

P4 = VO(sink) × IO = 1.1V × 1A = 1.10W

(5) Total internal power dissipation P

P = P1 + P2 + P3 + P4 = 2.22W

14. IC temperature Rise Measurement

Because the chip temperature of the IC cannot be measured directly, measurement according to one of the following

procedures should always be carried out.

14-1. Thermocouple measurement

A thermocouple element is mounted to the IC heat dissipation fin. This measurement method is easy to implement,

but it will be subject to measurement errors if the temperature is not stable.

14-2. Measurement using internal diode characteristics of IC

This is the recommended measurement method. It makes use of the parasitic diode incorporated in the IC between

FG1 and GND. Set FG1 to High and measure the voltage VF of the parasitic diode to calculate the temperature.

(Sanyo data: for IF = −1mA, VF temperature characteristics are about −2mV/°C)

15. NC Pins

Because NC pins are electrically open, they may be used for wiring purpose etc.

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 December, 2008. Specifications and information herein are subject

to change without notice.

PS No.6087-10/10

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