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參數(shù)資料
| 型號(hào)： | TA8275HQ |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 24 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 321K |
| 代理商： | TA8275HQ |
TA8275HQ
2006-04-28
6
5.3
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 ohm or less and output current over 4A 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 4V is made by the external
circuit failure.(Note4)
↓
The speaker impedance becomes 1 ohm or less as it is in a rare short circuit condition.
↓
The current more than 4A 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.)
5.4
Application
When output terminals short-circuit to Vcc or GND, the voltage of 25pin is fixed to “L”.
And when shorting OUT+ to OUT-, “L” and “H” are switched according to an input signal.
Therefore, it is possible to judge how the power IC condition is if a micro-controller detects the
25pin voltage that is smoothed out with LPF.
It is recommend that the threshold voltage(Vth) is set up as higher as possible because output level
of LPF is changed according to an input signal.
(for example, Vth is set up to 4V if 25pin is pulled up to 5V line.)
Current into a speaker
Speaker impedance
Less than 4
Figure 9
About 1
4
Operating point of protector
Output voltage of L.P.F.
Output power
5 V
Figure 10
Operating point of protector
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TA8275H | 24 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8276HQ | 23 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8276HQ | 23 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8276H | 23 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TA8277HQ | 28 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TA8276H | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Max Power 35 W BTL 】 4 ch Audio Power IC |
| TA8276HQ | 功能描述:音頻放大器 20W x 4ch 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 |
| TA8277 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:MAX POWER 43 W BTL x 4 CH AUDIO POWER IC |
| TA8277H | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:MAX POWER 43 W BTL x 4 CH AUDIO POWER IC |
| TA8300F | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:MOTOR DRIVER FOR CAMERA |
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