发明授权
- 专利标题： Switching power supply
- 专利标题（中）： 开关电源
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申请号： US11621664申请日： 2007-01-10
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公开(公告)号： US07385380B2公开(公告)日： 2008-06-10
- 发明人: Takuya Ishigaki , Takashi Sase , Akihiko Kanouda , Koji Tateno , Ryotaro Kudo
- 申请人： Takuya Ishigaki , Takashi Sase , Akihiko Kanouda , Koji Tateno , Ryotaro Kudo
- 申请人地址： JP Tokyo
- 专利权人： Renesas Technology Corp.
- 当前专利权人： Renesas Technology Corp.
- 当前专利权人地址： JP Tokyo
- 代理机构： Antonelli, Terry, Stout & Kraus, LLP.
- 优先权： JP2006-003765 20060111
- 主分类号： G05F1/575
- IPC分类号： G05F1/575 ; G05F1/618
摘要：
In a switching power supply apparatus for performing a switching control of a power MOS transistor that flows current to a coil and converting input voltage into output voltage, even if there occurs offset voltage in a current sensing operational amplifier, source potential of a current sensing MOS transistor is precisely kept at source potential of a low side power MOS transistor. For example, an offset cancel capacitor is arranged at an inverting input terminal of the current sensing operational amplifier, and voltage in the direction to offset the offset voltage occurring in the operational amplifier is charged to this capacitor.
公开/授权文献
- US20070262761A1 SWITCHING POWER SUPPLY 公开/授权日：2007-11-15
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