LM4808MX/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Class AB
Output Type:	Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load:	150mW x 2 @ 16 Ohm
Voltage - Supply:	2 V ~ 5.5 V
Features:	Depop
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Base Part Number:	LM4808

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Audio Linear Amplifiers: LM4808MX/NOPB

The LM4808MX/NOPB is a high-performance, low-noise, class-D audio power amplifier. This amplifier offers low distortion, high efficiency, and low noise, allowing it to accurately and reliably reproduce audio signals. The LM4808MX/NOPB can be used in a variety of audio applications, such as sound systems, loudspeakers, portable sound systems, media players, and computers.

Application Field

The LM4808MX/NOPB audio power amplifier can be used in a variety of audio applications, including sound systems, loudspeakers, portable sound systems, media players, and computers. It has a maximum output power of 2W into a 4 ohm load, providing plenty of power for larger sound systems. The amplifier has a low quiescent current, making it ideal for battery-operated systems. Additionally, the LM4808MX/NOPB is capable of driving both 8 ohm and 4 ohm loads.

Working Principle

The working principle of the LM4808MX/NOPB audio power amplifier is based on class-D technology. This technology uses pulse-width modulation (PWM) to switch the power transistors on and off, creating an analog signal at the output. The output signal is a combination of the input signal and a pulse-width-modulated signal. The PWM signal is created by comparison of the input signal and a sawtooth waveform by a comparator, which controls the power transistors. The power transistors are connected in a bridge configuration, in which two transistors act as switches for the load. When one transistor is on and the other is off, current is flowing through the load. When both transistors are on, the load is shorted and no current is flowing. The control circuit determines which transistors are on or off and when, creating the PWM signal.The output of the LM4808MX/NOPB is filtered to remove the PWM component, leaving only the audio signal. The filter consists of two parts, one low-pass filter and one high-pass filter. The LPF filters out the high-frequency component of the PWM signal, leaving only the audio component. The HPF filters out the low-frequency component of the PWM signal, again leaving only the audio component.

Conclusion

The LM4808MX/NOPB is a high-performance, low-noise, class-D audio power amplifier. This amplifier offers low distortion, high efficiency, and low noise, making it ideal for a variety of audio applications. The working principle of the LM4808MX/NOPB is based on class-D technology, which uses pulse-width modulation (PWM) to switch the power transistors on and off. The output signal is a combination of the input signal and a pulse-width-modulated signal, which is filtered to remove the PWM component, leaving only the audio signal.

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