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参数资料
| 型号： | TA8271HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 24 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 10/14页 |
| 文件大小： | 301K |
| 代理商： | TA8271HQ |
TA8271HQ
2006-04-28
5
4.
AUX Input (pin 16)
The pin 16 is for input terminal of AUX
amplifier.
The total gain is 0dB by using of AUX amplifier.
Therefore, the
-COM can directly drive the
AUX amplifier.
BEEP sound or voice synthesizer signal can be
input to pin 16 directly.
When AUX function is not used, this pin must be
connected to PRE-GND (pin 13) via a capacitor.
5.
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.)
Figure 6
AUX Input
20dB AMP.
IN
OUT (
+)
OUT (
)
16
AUX-IN
20dB
AUX AMP
-COM
Current into a speaker
Speaker impedance
Less than 4
Figure 9
About 1
4
Operating point of protector
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