发明名称 |
Switching power supply unit and electronic apparatus having display |
摘要 |
A switching power supply unit for providing an output voltage that is controlled such that a first detection voltage detected on the basis of the output voltage becomes equal to a first reference voltage. The peak voltage at the node of a serially connected coil and a switch of the switching power supply unit is detected and used as a second detection voltage for over-voltage protection. Thus, over-voltage protection of the switching power supply unit is secured with no additional terminal on the switching control IC for over-voltage protection even if such components as a feedback circuit and a rectifying diode of the power supply unit become open.
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申请公布号 |
US2005127883(A1) |
申请公布日期 |
2005.06.16 |
申请号 |
US20040967702 |
申请日期 |
2004.10.06 |
申请人 |
ROHM CO., LTD. |
发明人 |
HOSHINO TAICHI;MATSUO RYOUMA |
分类号 |
H02M3/155;G05F1/40;H02M1/32;H02M3/156;(IPC1-7):G05F1/40 |
主分类号 |
H02M3/155 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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