Title :
Integrated overcurrent protection system for class-D audio power amplifiers
Author_Institution :
Philips Semicond. Nijmegen, Netherlands
Abstract :
A fully integrated overcurrent protection system is presented suitable for application in integrated class-D audio power amplifiers. Accurate overcurrent detection is used based on parallel measurement of the voltage drop across the DMOS power transistors. A logic circuit enables continuous current limiting during overload situations. Actual short circuits can be distinguished from load impedance minima using a simple short-circuit discrimination method.
Keywords :
audio-frequency amplifiers; current limiters; logic circuits; overcurrent protection; power amplifiers; DMOS power transistors; class-D audio power amplifiers; current limiters; integrated overcurrent protection system; logic circuit; overcurrent detection; power FET amplifiers; pulse width modulation; short-circuit discrimination method; switching amplifiers; voltage drop; Circuit testing; Current limiters; High power amplifiers; Impedance; Loudspeakers; Power amplifiers; Power system protection; Power transistors; Pulse amplifiers; Switches; Audio amplifiers; current limiters; power FET amplifiers; pulse width modulation; switching amplifiers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2005.857369
