LM4702 Datasheet | National Semiconductor

Description The LM4702 is a high fidelity audio power amplifier driver designed for demanding consumer and pro-audio applications. Amplifier output power may be scaled by changing the supply voltage and number of output devices. The LM4702 is capable of delivering in excess of 300 watts per channel single ended into an 8 ohm load in the presence of 10% high line headroom and 20% supply regulation. The LM4702 includes thermal shut down circuitry that activates when the die temperature exceeds 150˚C. The LM4702’s mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state. The LM4702 is available in 3 grades that span a wide range of applications and performance levels. The LM4702C is targeted at high volume applications. The LM4702B (in development) includes a higher voltage rating along with the tighter specifications. The LM4702A (in development) is the premium part with the highest voltage rating, fully specified with limits over voltage and temperature, and is offered in a military 883 pliant TO-3 package. - Tentative Max Operating voltage for the LM4702A, LM4702B (in development) Key Specifications j Wide operating voltage range LM4702A (in development) LM4702B (in development) LM4702C j Equivalent Noise j PSRR j THD ± 20V to ± 85V ± 20V to ± 80V ± 20V to ± 75V 3µV 110d B (typ) 0.001% Features n n n n n Very high voltage operation Scalable output power Minimum external ponents External pensation Thermal Shutdown and Mute Applications n n n n AV receivers Audiophile power amps Pro Audio High voltage industrial applications Typical Application and Connection Diagrams Plastic Package - 15 Lead TO-220 (for LM4702; LM4702B, in development) Metal Can - 15 Lead TO-3 (for LM4702A, in development) FIGURE 1. Typical Audio Amplifier Application Circuit SPi Ke™ Protection and Overture™ are trademarks of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS2...