Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2007-09-11
2007-09-11
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S010000
Reexamination Certificate
active
11313066
ABSTRACT:
A threshold value adjustment circuit for adjusting a predetermined threshold value is provided in a stage followed by a protection circuit which starts protection operation when a load current flowing into an MOSFET exceeds the threshold value. A voltage proportional to a drain current and generated between the opposite ends of a current detection resistor Rd inserted between the high-side MOSFET and a positive power supply +V, and an output of an output voltage detection circuit for detecting the voltage amplitude of an analog signal from a low pass filter for modulating an output of a class D amplifier stage are inputted to the threshold value adjustment circuit. The threshold value adjustment circuit adjusts the threshold value in such a manner that a limit current of the MOSFET is set as the threshold value when the output voltage is large, and protection operation is started in response to a lower current than the limit current when the output voltage is small.
REFERENCES:
patent: 3707684 (1972-12-01), Nowell
patent: 5892404 (1999-04-01), Tang
patent: 6939347 (2005-09-01), Thompson
patent: 7076070 (2006-07-01), Pearce et al.
patent: 7170267 (2007-01-01), McJimsey
patent: 2002/0167354 (2002-11-01), Stanley
patent: 2003060449 (2003-02-01), None
Tamotsu Inaba, Basic and Practices of Power MOSFET Applications, CQ Publishing Co., Ltd., pp. pp. 68-72.
Kanoh Masaya
Noro Masao
Nguyen Patricia
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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