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TPA1517NEE4 参数 Datasheet PDF下载

TPA1517NEE4图片预览
型号: TPA1517NEE4
PDF下载: 下载PDF文件 查看货源
内容描述: 6 -W立体声音频功率放大器 [6-W STEREO AUDIO POWER AMPLIFIER]
分类和应用: 消费电路商用集成电路音频放大器视频放大器功率放大器光电二极管
文件页数/大小: 20 页 / 456 K
品牌: TI [ TEXAS INSTRUMENTS ]
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TPA1517  
www.ti.com  
SLOS162DMARCH 1997REVISED FEBRUARY 2007  
APPLICATION INFORMATION (continued)  
The audio outputs are biased to a midrail voltage which is shown by the following equation:  
V
CC  
2
V
+
MID  
The audio inputs are always biased to 2.1 V when in mute or normal mode. Any dc offset between the input  
signal source and the input terminal is amplified and can seriously degrade the performance of the amplifier. For  
this reason, it is recommended that the inputs always be connected through a series capacitor (ac coupled). The  
power outputs, also having a dc bias, must be connected to the speakers via series capacitors.  
MUTE/STANDBY OPERATION  
The TPA1517 has three modes of operation; normal, mute, and standby. They are controlled by the voltage on  
the M/SB terminal as described in Figure 24. In normal mode, the TPA1517 amplifies the signal applied to the  
two input terminals providing low impedance drive to speakers connected to the output terminals. In mute mode,  
the amplifier retains all bias voltages and quiescent supply current levels but does not pass the input signal to  
the output. In standby mode, the internal bias generators and power-drive stages are turned off, thereby  
reducing the supply current levels.  
22  
NORMAL  
9.3  
Undetermined State  
8.2  
MUTE  
3.5  
Undetermined State  
2
STANDBY  
0
Figure 24. Standby, Mute, and Normal (On) Operating Conditions  
The designer must take care to place the control voltages within the defined ranges for each desired mode,  
whenever an external circuit is used to control the input voltage at the M/SB terminal. The undefined area can  
cause unpredictable performance and should be avoided. As the control voltage moves through the undefined  
areas, pop or click sounds may be heard in the speaker. Moving from mute to normal causes a very small click  
sound. Whereas moving from standby to mute can cause a much larger pop sound. Figure 25 shows external  
circuitry designed to help reduce transition pops when moving from standby mode to normal mode.  
12  
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