TA8266H 데이터 시트보기 (PDF) - Toshiba
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TA8266H Datasheet PDF : 14 Pages
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TA8266H
6. Prevention of speaker burning accident (In Case of Rare Short Circuit of Speaker)
When the direct current resistance between OUT + and OUT - terminal becomes 1 W or less and output
current over 4 A flows, this IC makes a protection circuit operate and suppresses the current into a speaker.
This system makes the burning accident of the speaker prevent as below mechanism.
<The guess mechanism of a burning accident of the speaker>
Abnormal output offset voltage (voltage between OUT + and OUT -) over 4 V is made by the external
circuit failure.(Note 1)
¯
The speaker impedance becomes 1 W or less as it is in a rare short circuit condition.
¯
The current more than 4 A flows into the speaker and the speaker is burned.
Current into a speaker
Less than 4 W
Operating point of protector
About 1 W 4 W
Figure 9
Speaker impedance
Note 1: It is appeared by biased input DC voltage
(for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
6
2002-02-13
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