Patent ID: 7847632

Claim:
A short-circuit detecting circuit for detecting an output short-circuit of a class-D amplifier including an output stage input pulse signal generating part for generating two output stage input pulse signals on the basis of an amplifier input pulse signal and an output part for generating an output pulse signal on the basis of inputs of said two output stage input pulse signals, comprising: a comparison pulse generating part for comparing a signal level of one of said two output stage input pulse signals with a high-level generating threshold value and comparing a signal level of the other one of said two output stage input pulse signals with a low-level generating threshold value, thereby generating two comparison pulse signals; a pulse level comparing part for comparing a signal level of the output pulse signal from said class-D amplifier within a period of time corresponding to a pulse width of each of said two comparison pulse signals with a high-side detection threshold value and a low-side detection threshold value, thereby obtaining level comparison results; and a short-circuit detection signal output part for generating a short-circuit detection signal in accordance with said level comparison results.