Invention Grant
- Patent Title: Power supply device with gain changing error amplifier
- Patent Title (中): 具有增益变化误差放大器的电源装置
-
Application No.: US12601928Application Date: 2008-10-16
-
Publication No.: US08330440B2Publication Date: 2012-12-11
- Inventor: Takatsugu Wachi
- Applicant: Takatsugu Wachi
- Applicant Address: JP Kyoto
- Assignee: Rohm Co., Ltd.
- Current Assignee: Rohm Co., Ltd.
- Current Assignee Address: JP Kyoto
- Agency: Fish & Richardson P.C.
- Priority: JP2007-286365 20071102
- International Application: PCT/JP2008/068722 WO 20081016
- International Announcement: WO2009/057453 WO 20090507
- Main IPC: G05F1/575
- IPC: G05F1/575
Abstract:
A power supply device is provided with an output transistor for outputting a switch voltage having a rectangular waveform, based on an input signal by being switching-controlled by a pulse width modulation signal; a reference voltage generating circuit for generating a prescribed reference voltage; an error amplifier wherein a feedback voltage depending on the switch voltage and the reference voltage are inputted, an error voltage is generated by amplifying a difference between the voltages, and changes a gain of itself, in accordance with a current signal generated inside based on the feedback voltage and the reference voltage; an oscillator for generating an oscillation signal; and a comparator wherein the oscillation signal and the error voltages are inputted and the pulse width modulation signal is outputted by comparing the voltages.
Public/Granted literature
- US20100176776A1 POWER SUPPLY DEVICE Public/Granted day:2010-07-15
Information query
IPC分类:
