| 摘要 |
PROBLEM TO BE SOLVED: To equip a constant voltage power supply device having a high speed load response characteristic with a L-shaped overcurrent protection function, to precisely decide a predetermined current value to be protected without depending on an ambient temperature or a usage condition, to maintain a low current in an overcurrent protection operating time, and to ensure an offset quantity with which starting is secured. SOLUTION: The sum voltage of a return voltage and an offset voltage is compared with an output current detection voltage (that is, an output current), while the offset voltage is characterized to be inversely proportional to the output current so that the offset voltage is increased when the output current is low and is reduced with an increase in the output current. A return quantity of an alternating constituent is increased for increasing an ESR of an output side capacitor equivalently, and phase compensation for preventing oscillation is carried out surely. COPYRIGHT: (C)2005,JPO&NCIPI
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