FITERLESS HIGH EFFICIENCY 3W SWITCHING AUDIO AMPLIFIER
DESCRIPTION
The M4670 is a fully integrated single-supply, high-efficiency
Class D switching audio amplifier, and it can provide 3W of output
power. Containing adjustable output gain chip with micro-power
shutdown mode, the M4670 has innovative modulation schemes
that eliminate the output filter wave devices and thus reduces the
requirement of external components helping to streamline the circuit
design and reduce board area.
By using delta-sigma modulation technique which handles
incoming analog signal, the M4670 can reduce the output noise and
total harmonic distortion.
Operating on a single 5V supply, the M4670 can be a
continuous average output of 2.3W of power to driver the 4Ω
speaker, and the total harmonic distortion and noise (THD+N) are
less than 1%. High power conversion efficiency of the M4670 can
drive a larger load speaker that is respectively comparable to the
typical Class AB amplifier. Its can be used with a 3.6V, 600mW
power supply to driver an 8Ω speaker, while the efficiency is as high
as 88%.
The M4670 has a high output power characteristics that makes
it ideal for ultra-high-power walkie-talkies, mobile phones,
hands-free intercom systems and applications |
