source:Industry News Popular:adapter release time:2021-06-29 09:40:33 Article author:sznbone
After the rectifier filter circuit is the main circuit of the flyback power adapter, the main tasks that need to be done are the determination of the switching frequency, the design of the transformer, the selection of switching tube parameters and the selection of the maximum duty cycle, the selection of the output rectifier and the output filter capacitor.
In order to reduce costs, most of the switching tubes choose 600V rated voltage. For the flyback power adapter with output 60W, the switching tube will withstand a peak current of about 2A. Considering that the 600V MOSFET on-resistance is relatively large, especially in the state of high junction temperature. With a relatively large current margin, it is a better choice to consider the IRFBC40 (600V/6A/1.20) grade MOSFET from the perspective of easy procurement.
The output rectifier needs to withstand voltage not less than 90V withstand voltage. You can choose a Schottky diode with a withstand voltage of 120V. If you can choose an ultra-fast reverse recovery diode in order to reduce costs, you can choose a withstand voltage of 200V, so the selected voltage margin is relatively large. If you choose BYQ28X-200 (some brands can offer a price of 0.45 yuan), this model can withstand a voltage of 200V and a rated rms current of 14A. It can meet the design requirements.
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