Minimum_component_bridge_amplifier

Published:2009/7/23 20:11:00 Author:Jessie | From:SeekIC

This circuit shows two LM380 ICs connected to double the audiooutput power of a single LM380.The Circuit provides twice the voltage swing across the load for a given supply, increasing the power capability by a factor of four over the single amplifier. However, in most cases, the package dissipation is the first parameter that limits power to the load. In such cases, the power capability of the bridge circuit is only twice that of the single IC. Figures 1-37B and 1-37C show output power versus device-package dissipation for both 8- and 16-Ω loads in the bridge configuration. Notice that the 3% and 10% harmonic distortion contours double back (because of the thermal limiting of the LM380). Different amounts of heatsinking will change the point at which the distortion contours bend.



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