发明名称 |
Constant-voltage circuit capable of reducing time required for starting, semiconductor apparatus including constant-voltage circuit, and control method of constant-voltage circuit |
摘要 |
<p>A constant-voltage circuit (1) includes a switching regulator (2) and a series regulator (3) each configured to start operating according to a selection signal input from outside for exclusively causing one of the switching and series regulators to operate, and convert an input voltage (Vin) input to an input terminal (IN) to a rated voltage to output to an output terminal (OUT). The switching regulator performs a soft-start operation for raising an output voltage (Vout) to the rated voltage at a constant speed when starting operation. The series regulator regulates a current so that an output current does not exceed a predetermined value, simultaneously starts operating when the switching regulator starts operating, and automatically stops outputting a current to the output terminal when the soft-start operation is completed. A semiconductor apparatus provided with a predetermined function includes the constant-voltage circuit. A control method controls the constant-voltage circuit.</p> |
申请公布号 |
EP1715568(A2) |
申请公布日期 |
2006.10.25 |
申请号 |
EP20060252072 |
申请日期 |
2006.04.13 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
AGARI, HIDEKI;SAKAI, YOHICHI |
分类号 |
H02M3/155;H02M3/157 |
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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