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LM4951ASD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4951ASD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  September 5, 2008 LM4951A Wide Voltage Range 1.8 Watt Audio Amplifier With Short Circuit Protection General Description The LM4951A is an audio power amplifier designed for ap- plications with supply voltages ranging from 2.7V up to 9V. The LM4951A is capable of delivering 1.8W continuous av- erage power with less than 1% THD+N into a bridge connect- ed 8 Ω load when operating from a 7.5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4951A does not require boot- strap capacitors, or snubber circuits. The LM4951A features a low-power consumption active-low shutdown mode. Additionally, the LM4951A features an in- ternal thermal shutdown protection mechanism and short circuit protection. The LM4951A contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4951A is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications ■ Wide Voltage Range 2.7V to 9V ■ Quiescent Power Supply Current (V DD = 7.5V) 2.5mA (typ) ■ Power Output BTL at 7.5V, 1% THD 1.8W (typ) ■ Shutdown Current 0.01µA (typ) ■ Fast Turn on Time 25ms (typ) Features ■ Pop & click circuitry eliminates noise during turn-on and turn-off transitions ■ Wide supply voltage range: 2.7V to 9V ■ Low current, active-low shutdown mode ■ Low quiescent current ■ Thermal shutdown protection ■ Short circuit protection ■ Unity-gain stable ■ External gain configuration capability Applications ■ Portable devices ■ Cell phones ■ Laptop computers ■ Computer speaker systems ■ MP3 player speakers Boomer® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation 300578 www.national.com |
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