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参数资料
| 型号： | TA8266HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 23 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 13/16页 |
| 文件大小： | 314K |
| 代理商： | TA8266HQ |
TA8266HQ
2006-04-28
6
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 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
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.
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.)
Current into a speaker
Speaker impedance
Less than 4
Figure 9
About 1
4
Operating point of protector
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