25W continuous 28W peak value multi-output power supply circuit

Published:2011/6/19 18:58:00 Author:TaoXi | Keyword: 25W, continuous, 28W, peak value, multi-output, power supply | From:SeekIC

The power supply of the DVD or the set-top box in the figure is designed as the flyback converter with the TNY280PN(U1). In this design, the 10μF capacitance C4 uses the enhanced current-limit point of U1, this point makes the power supply to output the 28W peak power when the device is starting or in the load transient. The 25W continuous 28W peak value multi-output power supply is in every enable switching cycle, the MOSFET of the U1 conducts, the current gets through the primary winding of the transformer T1. When the primary stage current reaches the MOSFET current-limit point, the MOSFET turns off, the energy of the transformer T1 is transmited to the secondary stage. The over-voltage protection is realized by the U2, R12, R13, VR1 and VR2.



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