LM4906 - 具有内部可选增益的 1W、旁路电容器更少音频功率放大器

LM4906是TI德州仪器公司的一款扬声器放大器（AB类/D类）产品，LM4906是具有内部可选增益的 1W、旁路电容器更少音频功率放大器，本站介绍了LM4906的封装应用图解、特点和优点、功能等，并给出了与LM4906相关的TI元器件型号供参考。

LM4906 - 具有内部可选增益的 1W、旁路电容器更少音频功率放大器 - 扬声器放大器（AB类/D类） - 低功耗放大器 - 德州仪器

产品描述

The LM4906 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1W of continuous average power to an 8? BTL load with less than 1% distortion (THD+N) from a +5V power supply.

The LM4906 is the first Texas Instruments Boomer Power Amplifier that does not require an external PSRR bypass capacitor. The LM4906 also has an internal selectable gain of either 6dB or 12dB. In addition, no output coupling capacitors or bootstrap capacitors are required which makes the LM4906 ideally suited for cell phone and other low voltage portable applications.

The LM4906 contains advanced pop and click circuitry that eliminates noise, which would otherwise occur during turn-on and turn-off transitions.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4906 features a low -power consumption shutdown mode (the part is enabled by pulling the SD pin high). Additionally, the LM4906 features an internal thermal shutdown protection mechanism.

产品特性

Selectable Gain of 6dB (2V/V) or 12dB (4V/V)
No Output or PSRR Bypass Capacitors Required
Improved “Click and Pop” Suppression Circuitry
Very Fast Turn on Time: 5ms (Typ)
Minimum External Components
2.6 - 5.5V Operation
BTL Output Can Drive Capacitive Loads
Ultra Low Current Shutdown Mode (SD Low)

Key Specifications

Improved PSRR at 217Hz for +3V: 71 dB
Power Output at +5V, THD+N = 1%, 8?: 1.0 W (Typ)
Power Output at +3V, THD+N = 1%, 8?: 390 mW (Typ)
Total Shutdown Power Supply Current: 0.1µA (Typ)

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