Class D amplifier

Details Class D amplifier Class D amplifier

2005-02-22

2005-02-22

Nguyen, Khanh V. (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S251000

Reexamination Certificate

active

06859096

ABSTRACT:
A detecting circuit (REFH, CM11, LA1, TN1, RN1) which detects an overcurrent flowing through a power-MOS transistor (401) in an output stage to output a first signal (ITN1) is disposed in a first driving circuit (303H) on the side of a high-side driver. Another detecting circuit (REFL, CM21, LA2, TN2, RN2) which detects an overcurrent flowing through a power-MOS transistor (402) in the output stage to output a second signal (ITN2) is disposed in a driving circuit (303L) on the side of a low-side driver. The first signal (ITN1) is converted to a third signal (ITT2) based on a negative power supply (VPP−), by a signal converting circuit. The third signal is added to the second signal. In response to the addition signal, a pulse signal to be input to the driving circuits (303H and303L) is blocked.

REFERENCES:
patent: 4649565 (1987-03-01), Kaizer et al.
patent: 5617058 (1997-04-01), Adrian et al.
patent: 6091292 (2000-07-01), Higashiyama et al.
patent: 6414614 (2002-07-01), Melanson

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