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National Semiconductor has released three high-performance driver chip for use in audio power amplifiers. They are LME49810, 49830 and 49811. They are very similar to each other. We therefore take some measurements to evaluate their performance in practical usages.

From the data sheet, we know that LME49811 has far less driving capability than LME49810. A driver for output stage is necessary regardless of BJT or MOSFET output transistors.

R1 and R2 = 22 W are used in LME49810 and 49830 tests. R1 and R2 = 22 W or 0 Ω are used in LME49811 tests. Cc = 22 pF is used in all cases.

 

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