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|15th February 2007, 03:11 AM||#1|
Join Date: May 2004
Location: Cranbrook BC
5 ICs: National Semiconductor LM4651N 170W Class D Audio Amplifier. http://www.national.com/pf/LM/LM4651.html
5 ICs: National Semicondutor LM4652TF 170W Class D Audio Amplifier
Q: Can the LM4651/LM4652 be used for frequency ranges other than subwoofer?
A: Yes. The audio frequency range is controlled by the external components and is not limited by the LM4651/52 chip set. Several external values need to be changed to increase or decrease the audio frequency range of operation. To increase the audio frequency range of operation the following values must change: L1 and CBYP (the output filter) must decrease, Cfl1, Cfl2 and Cf may need to decrease but normally this is not the case, R1, R2, and Rf may need to change to lower noise and gain to meet target specifications, ROSC may need to decrease, RDLY will need to be reduced or set to 0 §Ù . A pre-amplifier with a gain of 10V/V and a 2 pole active input filter is recommended. The input filter will control the audio frequency range while the output LC filter will be set to high levels to allow the frequency range of interest to have a flat, linear response through the output filter. This pre-amplifier/filter can be implemented easily with a low cost dual op. amp. like the LM833.
5 ICs: National Semiconductor LM4652TA
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