TA8266HQ 查看數據表（PDF） - Toshiba
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TA8266HQ Datasheet PDF : 16 Pages
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TA8266HQ
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 Ω 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 4)
↓
The speaker impedance becomes 1 Ω 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 Ω
Operating point of protector
About 1 Ω 4 Ω
Figure 9
Speaker impedance
Note 4: It is appeared by biased input DC voltage
(for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
6
2006-04-28
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