| 摘要 |
A multi-output SMPS(Switching Mode Power Supply) protection circuit is provided to cut off power supply to a secondary terminal by stopping a switching operation in abnormality of an SMPS circuit. A multi-output SMPS protection circuit includes a rectifying unit(11), a plurality of output terminals(41~44), a switching unit(12), a feedback unit(60), and a diode(33). The rectifying unit rectifies AC voltage into DC voltage to apply the rectified voltage to a primary side of a transformer(50). The output terminals are connected to a secondary side of the transformer and output different DC voltages. The switching unit controls amplitude of the voltage applied to the primary side of the transformer. The feedback unit feeds the output voltage of the first output terminal back to the switching unit. The diode has a cathode terminal connected to the second output terminal, which outputs the voltage lower than that of the first output terminal, and an anode terminal connected to the feedback unit.
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