Intersil Corporation

Harold A Witlinger

Stuart W Pullen

The OCL,receives two logic signals: the first, OC upper FET, is high when an over current condition exists in the upper FET,; the second, OC lower FET, is high when an over current condition exists in the lower FET,. When the over current condition is in FET,, PMOS,turns on and injects current into the summing junction of the integrator,through Rcl. The net effect is turn off the upper FET,and turn on the lower FET,. This reduces the current in FET,. As far as amplifier,is concerned, the net effect is gain compression. Since upper FET,is on less and the lower FET,is on more, the gain of the audio signal is reduced. When the over current condition is in FET,, NMOS,turns on and pulls current out of the summing junction, turns the lower FET,off, and turns the upper FET,on. The net effect is to reduce the current in the lower FET. At audio frequencies, the gain is reduced.

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Pennington, NJ, United States of America

Harold A Witlinger