This is the 3W Class-D audio amplifier circuit build using power IC LM48511 manufactured by National Semiconductor. The circuit is very simple with a few external components. The 3W Class D amplifier features a low noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further minimize the requirement for output filters.
The LM48511 can be applied for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high output power is not required.
LM48511 Features:
- Selectable spread spectrum mode reduces EMI
- 3W Output into 8Ω at 5V with THD+N = 1%
- 80% Efficiency
- Dynamically Selectable Regulator Output Voltages
- Independent Regulator and Amplifier Shutdown Controls
- Filterless Class D
- Only need 3.0V – 5.5V power supply for operation
- Low Shutdown Current
- Click and Pop Suppression
Download LM48511 datasheet for your project reference: download here
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