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National Semiconductor Corporation (NS) announced the latest release of a single 2.65WD Class D Boomer® audio amplifier that significantly reduces electromagnetic interference, not only in compliance with the Federal Communications Commission (FCC) regulations, but also below the minimum required The standard is also 11dB lower. With this audio amplifier, mobile phones, smart phones, music players, laptops, DVD players, video game consoles and other portable electronics, you can further reduce system noise.The new LM4675 is a high-power, Class D mono audio amplifier featuring a single power supply and no additional filters, and a small LLP® or 0.5mm pitch. Available in two micro SMD packages. This new class of power amplifiers not only takes advantage of the unique spread spectrum technology, but also uses a low-noise, filter-free pulse width modulation (PWM) structure, which significantly reduces electromagnetic interference (EMI) without the need for additional Set the output filter. The advantage of this combination is that it can reduce the number of external components, save board space on the board, reduce system cost, and streamline circuit design.
National Semiconductor uses spread spectrum technology to fully optimize the circuit design of the new Class D amplifier to improve operational efficiency. This amplifier can drive 8W load speakers with 3.6V power. If the output power is 100mW, the efficiency can reach 80% or more. If the output power is 400mW, the efficiency is up to 89%. National Semiconductor plans to use this ultra-low EMI technology to develop future generations of products, including the stereo version of the LM4675 chip.
National's LM4675 chip consumes only 1.6mA when operating from a 2.7V supply. With this chip, mobile phones can extend talk time; while other portable electronic products can be played for a long time without the support of this chip, allowing users to enjoy listening. In addition, this chip is suitable for a wide supply voltage range of 2.4V to 5.5V.
National Semiconductor has added a number of new features to this amplifier, such as differential inputs that reduce noise. In addition, the amplifier features the industry's lowest power-down shutdown mode, output short-circuit and overtemperature protection, and built-in advanced switching/switching noise suppression circuitry that eliminates the output transient response generated during startup or shutdown. The gain of the LM4675 chip can be externally configured, allowing the user to connect multiple different inputs on the one hand and maximize the gain of each source or system on the other hand.
The LM4675 requires only a single 5V supply to continuously deliver 2.2W of power, driving a 4W speaker load with less than 1% total harmonic distortion and noise. The quiescent current of the LM4675 is lower than that of most competitive products. If the noise is 217Hz, the power supply rejection ratio (PSRR) is as high as 82dB, the common mode rejection ratio (CMRR) is as high as 80dB, and the signal-to-noise ratio is 82dB. 17ms (typical).
The LM4675 is available in two packages, $0.98 each in an 8-pin LLP® package, and $0.95 each in a 9-bump 0.5mm pitch micro SMD package. The chips are all purchased in 1,000 units and are available in large quantities.
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