Summary:
working principle
The flyback power supply uses the TNY278PN (U1) with an output of 5 V/2 A at 90-265 VAC AC input. Such applications include portable audio players, USB chargers, and devices that require a 5 V output voltage.
Optocoupler feedback using the reference IC is chosen to achieve accurate, tight output regulation. The feedback signal is fed into the EN/UV pin of U1. IC U1 uses the on/off control to adjust the ratio of the enable and disable switching cycles to achieve the purpose of regulating the output voltage. This also optimizes the converter's efficiency and load characteristics, providing a flat characteristic as shown in Figure 2, which is ideal for meeting energy efficiency requirements.
10W portable audio player adapter circuit diagram
See the PDF document for details (click on the PDF file to download)
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