| 摘要 |
An apparatus and a method to limit a current by having different limiting references according to pulse widths of a current signal in an audio amplifier. The apparatus includes a pulse width modulator to generate a PWM signal by comparing an input audio signal and a reference signal, a power switching unit to switch a voltage source according to the PWM signal generated by the pulse width modulator, a current detector to detect a current signal flowing through a load by the voltage source supplied by the power switching unit, and a controller to apply different limiting values to different current levels according to pulse widths of the current signal detected by the current detector and to control the PWM signal generated by the pulse width modulator by comparing the applied limiting value to a current level value of the current signal detected by the current detector.
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