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LM4906 Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM4906 Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  LM4906 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain General Description The LM4906 is an audio power amplifier primarily designed for demanding applications in mobile phones and other por- table communication device applications. It is capable of delivering 1W of continuous average power to an 8 Ω BTL load with less than 1% distortion (THD+N) from a +5V power supply. The LM4906 is the first National Semiconductor Boomer Power Amplifier that does not require an external PSRR bypass capacitor. The LM4906 also has an internal select- able 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 inter- nal thermal shutdown protection mechanism. Key Specifications j Improved PSRR at 217Hz for +3V 71dB j Power Output at +5V, THD+N = 1%, 8 Ω 1.0W (typ) j Power Output at +3V, THD+N = 1%, 8 Ω 390mW (typ) j Total shutdown power supply current 0.1µA (typ) Features n Selectable gain of 6dB (2V/V) or 12dB (4V/V) n No output or PSRR bypass capacitors required n Improved “Click and Pop” suppression circuitry n Very fast turn on time: 5ms (typ) n Minimum external components n 2.6 - 5.5V operation n BTL output can drive capacitive loads n Ultra low current shutdown mode (SD Low) Applications n Portable computers n Desktop computers n Multimedia monitors Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 200571B9 FIGURE 1. Typical Audio Amplifier Application Circuit May 2003 © 2003 National Semiconductor Corporation DS200571 www.national.com |
Podobny numer części - LM4906 |
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Podobny opis - LM4906 |
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