发明申请
- 专利标题： Power supply apparatus capable of supplying a stable converted voltage
- 专利标题（中）： 能够提供稳定转换电压的电源装置
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申请号： US10970757申请日： 2004-10-21
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公开(公告)号： US20050088856A1公开(公告)日： 2005-04-28
- 发明人: Isao Yamamoto , Yoichi Tamegai
- 申请人： Isao Yamamoto , Yoichi Tamegai
- 优先权： JPJP2003-363896 20031023
- 主分类号： G05F1/56
- IPC分类号： G05F1/56 ; H02J1/02 ; H02M3/155 ; H02M3/158 ; H02M3/335
摘要：
A power supply apparatus switchably operates an LDO regulator and a DC/DC converter connected in parallel so as to control a battery voltage Vbat from a power supply at a constant output voltage VO. A detected voltage Vs at a shared output terminal shared by the LDO regulator and the DC/DC converter is input to a feedback input terminal and fed back to the LDO regulator and the DC/DC converter. In order to suppress an undershoot occurring when switching from the LDO regulator to the DC/DC converter, a timing signal generating unit supplies a capability switching timing signal to a pre-drive circuit and switches the control capability of the DC/DC converter from a low capability mode at startup to a high capability mode.
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