发明授权
US07843179B2 Control circuit for synchronous rectifier-type DC-DC converter, synchronous rectifier-type DC-DC converter and control method thereof
有权
同步整流型DC-DC转换器的控制电路，同步整流型DC-DC转换器及其控制方法
- 专利标题： Control circuit for synchronous rectifier-type DC-DC converter, synchronous rectifier-type DC-DC converter and control method thereof
- 专利标题（中）： 同步整流型DC-DC转换器的控制电路，同步整流型DC-DC转换器及其控制方法
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申请号： US11937818申请日： 2007-11-09
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公开(公告)号： US07843179B2公开(公告)日： 2010-11-30
- 发明人: Morihito Hasegawa , Takashi Matsumoto , Ryuta Nagai
- 申请人： Morihito Hasegawa , Takashi Matsumoto , Ryuta Nagai
- 申请人地址： JP Yokohama
- 专利权人： Fujitsu Semiconductor Limited
- 当前专利权人： Fujitsu Semiconductor Limited
- 当前专利权人地址： JP Yokohama
- 代理机构： Arent Fox LLP
- 优先权： JP2006-305621 20061110
- 主分类号： G05F1/59
- IPC分类号： G05F1/59
摘要：
To provide a control circuit for a synchronous rectifier-type DC-DC converter, a synchronous rectifier-type DC-DC converter and a control method thereof in which, in a light load state and a no-load state, an output voltage can be dropped to thus prevent an overshoot state from continuing. A synchronous rectifier-type DC-DC converter 10 and a control circuit 20A thereof comprising a first switching element FET1 that is made conductive when power is accumulated in an induction element L1, and a second switching element FET2 that is made conductive when power accumulated in induction element L1 is supplied to a load, also comprises a detecting unit COMP2 that detects that a value of an output voltage VOUT of the synchronous rectifier-type DC-DC converter 10A is a predetermined voltage value that is higher than a target voltage value, and control units COMP1 and OR1 that maintain the second switching element FET2 in a conductive state after discharge of the power accumulated in the induction element L1 is finished, based on the detection results of the detecting unit COMP2.
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