TPA2011D1: A momentary short circuit cause IC broken down

Linch

Part Number: TPA2011D1

In our device, we use TPA2011D as AMP, and the output connect a 3.5mm Phone Jack to 8Ω speaker.

We found when we remove the phone jack from connector, it will cause a momentary short circuit between AMP output L+/L-. And then TPA2011D broken down.

In the datasheet, TPA2011D has Auto-Recovering Short-Circuit Protection, but why TPA2011D broken down?

6 个月前

0 Alice 6 个月前

TI__Mastermind 39700 points

您好，
已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

0 Linch 6 个月前回复 Alice

Prodigy 10 points

你好，这个问题有什么进展吗？在demo板上，如果将输出的两端短路，也会发生烧毁芯片的现象吗？

0 Links 6 个月前回复 Linch

TI__Mastermind 33040 points

您能否确认是电路板上的放大器或其他元件损坏了吗？输出端连接了几个元件、包括铁氧体、二极管和扬声器本身、只是想确保所有其他元件都已经过验证。

3.5mm 插孔的任何引脚上是否有直流电压？也许输出短接至比 VDD 更高的电压。

在连接/断开插孔之前将设备设置为关断模式可能有助于防止损坏、但这并不保证。

0 Linch 6 个月前回复 Links

Prodigy 10 points

1.已确认过是芯片损坏，周围器件正常。我们更换芯片后，可以正常输出。

2.我们连接方式如下图，不会有直流电压。

0 Links 6 个月前回复 Linch

TI__Mastermind 33040 points

感谢您提供的信息。

我可能建议检查的另一件事是在不使用外部组件的情况下重复插拔顺序。也许电感和电容分量中存储的电荷最终导致了放大器输出的瞬态。

0 Linch 6 个月前回复 Links

Prodigy 10 points

我们做过实验，在功放输出时，用镊子瞬间短接功放输出端，也会造成芯片烧毁。

另外我想请教一下，规格书上有短路保护功能，但是使用时确实存在短路但是未保护成功的。所以这个功放短路保护有效的条件是什么？

0 Links 6 个月前回复 Linch

TI__Mastermind 33040 points

Hi,

Is the output short circuit being tested with all the external components? (ferrites, capacitor, etc)
Perhaps the additional charge on components at the output of the amp discharge through the amplifier causing the damage?

The device protection should work to prevent damage on shorting the outputs of the amplifier to each other, to GND or VDD (5V).

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Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

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TPA2011D1: A momentary short circuit cause IC broken down