|Alguien dijo ...|
|La ciencia consiste en sustituir el saber que parecía seguro por una teoría, o sea, por algo problemático.|
José Ortega y Gasset(1883-1955).
|Filterless Class-D Audio Amplifier for Portable Applications|
PHOENIX, Ariz. – Expanding its audio amplifier portfolio, ON Semiconductor (Nasdaq: ONNN)
today introduced the NCP2820 - a cost-effective, filterless Class-D audio amplifier designed for portable
applications such as cell phones, digital cameras, portable media players, notebook PCs, LCD monitors, and other
handheld devices. NCP2820 enhances the highest audio amplification power with the minimum board space, and extends
battery life thanks to its high efficiency and low shutdown current.
From a 5 volt (V) supply, the NCP2820 is
capable of delivering 2.65 watts (W) of continuous average power into a 4 ohm bridge-tied load (BTL). Under the same
conditions, the output power stage can provide 1.4 W into an 8 ohm BTL load with less than 1 percent Total Harmonic
Distortion plus Noise (THD+N). For a device in a small 1.45 mm x 1.45mm, Flip-Chip, chip-scale package (CSP) and an
input voltage range of 2.5 V to 5.5 V, the NCP2820 drives clean audio output with the highest power in the market.
The device offers space and cost savings because no output filter is required when using inductive transducers. With
up to 90 percent power efficiency and a very low shutdown current of typically 0.42 micro amps (µA), this audio
amplifier reduces battery drain and drastically lowers the junction temperature, hence reducing heat dissipation
within compact portable devices.
Lunes, 20 Junio, 2005 - 07:07