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參數(shù)資料
| 型號： | TB2904HQ |
| 廠商： | Toshiba Corporation |
| 英文描述： | Maximum Power 43 W BTL ?4-ch Audio Power IC |
| 中文描述： | 最大功率43糯橋接？4通道音頻功率IC |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 272K |
| 代理商： | TB2904HQ |
TB2904HQ(o)
2004-03-26
6
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 1)
↓
The speaker imepedance 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 1: It is appeared by biased input DC voltage
(For example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
Figure 8
Current into a speaker
Speaker Impedance
Less than 4A
About 1
4
Operating point of protector
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TB2905HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Class KB High-Efficiency, Low-Frequency Power Amplifier IC Maximum Power: 47 W x 4 Channels |
| TB2905HQ(O) | 功能描述:音頻放大器 25W x 4ch Class-KB Car Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TB2906HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 43 W BTL x 4-ch Audio Power IC |
| TB2913HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 47 W BTL 】 4-ch Audio Power IC |
| TB2915AHQ(O) | 制造商:Toshiba America Electronic Components 功能描述:IC AMP BTL AUDIO 45W 4CH HZIP25 |
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