Gain Adjustable Audio Line Driver TPF6XX
The TPF6XX are 3PEAK pop-free audio stereo line driver which have below features:
1、Line outputs have ±8kV IEC HBM ESD and ±2kV IEC CDM ESD, This feature makes TPF6XX very suitable for STB, DVR’s audio line out application.
In Set-top box application, customer often meet ESD and surge issues which were caused by interface hot plug ,unstable power supply or other factors, so it needs very robust ESD and surge immunity capability on the output of the audio output port.
Currently, for the mute function circuit design which integrated in most of the audio line driver chip, just connecting the output of the OPA with one or several transistors shorted to ground: When the chip is working on normal status, this transistors is useless, When meet high rating ESD or surge voltage on the output of the chip, the high inrush current always find the weakest way to release the energy, so it may make the chip permanent damaged. This conventional audio driver chip design architecture has serious limitations on Electrostatic protection and surge protection, usually customer has to add extra TVS device on the output port, but it will add the BOM cost.
3PEAK TPF6XX use improved high performance ESD and surge immunity architecture design: this series product move the mute circuit from the output to other place, so it could make sure the chip’s output different device have the same working loading, meanwhile, this output device also have improved ESD immunity design. When the ESD or surge occurs, the high-voltage current could be apportioned evenly by the chip’s internal device, so it could protect the internal device far from damaged.
2、Built-in click and pop reduction circuit, the new architecture audio line drivers TPF6XX requires no output dc blocking capacitors, further lower the BOM cost.
3、Short-Circuit Protection, The TP6XX has an external under-voltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown. This makes TP6XX very suitable for portable audio player application.
4、3.3V or 5V single power supply, improved the low frequency response and THD performance.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/12/25 |
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REV 0.0 |
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AN1302 |
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576 KB |
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