Pulse width modulation amplifier

摘要

A pulse width modulation amplifier having flat frequency characteristics including a comparator having an inverting input terminal coupled to an input signal source through a first resistor with the output of a ramp wave oscillator coupled to the non-inverting input terminal. The output of the comparator is coupled to a switching amplifier and a low-pass filter is coupled between the output of the switching amplifier and a load. A second resistor is coupled between the output of the switching amplifier and the inverting input terminal of the comparator and a capacitor is coupled between the inverting input terminal and ground. The switching amplifier has an output circuit including an excess current detection circuit.