发明名称 |
METHOD AND APPARATUS OF LOW CURRENT STARTUP CIRCUIT FOR SWITCHING MODE POWER SUPPLIES |
摘要 |
A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the startup mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop with a current consumption of no more than a microampere. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the normal operation mode to the startup mode when the input supply voltage is below a second threshold voltage.
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申请公布号 |
US2010244804(A1) |
申请公布日期 |
2010.09.30 |
申请号 |
US20090466313 |
申请日期 |
2009.05.14 |
申请人 |
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
发明人 |
ZONG QIANG;FANG SHAOHUA;FEI REIXIA;XIE JIA |
分类号 |
G05F5/00 |
主分类号 |
G05F5/00 |
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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