Single-chip, 200V amplifier driver simplifies low-distortion design

National Semiconductor has introduced a single-chip, 200V power-amplifier output-stage driver that not only replaces more than 25 discrete components but also saves the burden of ensuring matching between individual devices.

The LME49810 has 60mA output current capability, which maximises flexibility for designers to optimise output power and to scale designs up to 3000W by selecting suitable output transistors. When implemented in a complete power amplifier, the LME49810 enables low Total Harmonic Distortion plus Noise (THD+N) of 0.0007%. In addition to audio amplifier applications, the LME49810 is suitable for use in highvoltage industrial systems requiring low distortion.

Valuable protection features include an integrated Baker clamp to minimise distortion and prevent speaker damage if the amplifier is over-driven. In addition, a thermal protection scheme is activated if the die temperature exceeds 150°C, to prevent long-term thermal stress to the IC and thereby maximise reliability.

 

FEATURES 50V/µs slew rate 110dB Power Supply Rejection Ratio (PSRR) Operating voltage range: ±20V to ±100V 12mA typical supply current

APPLICATIONS Powered studio monitors and sub-woofers Commercial sound reinforcement Professional mixers Distributed audio Guitar amplifiers

 

 

National Semiconductor/LME49810