Definition

Flyback switching power supply is a lowest cost power supply circuit, the output power is 20-100 W, can output different voltages at the same time, and has a good voltage adjustment rate. The only disadvantage is that the output ripple voltage is large, the external characteristics are poor, and it is suitable for relatively fixed loads.

The switching tube VT1 used in flyback switching power supply withstands a maximum reverse voltage that is twice the operating voltage value of the circuit, and the operating frequency is between 20-200kHz.

Flyback switching power supply conventional working mode has CCM mode and DCM mode, this kind of topology is mainly suitable for LED lighting, battery charger and other small power occasions, the selection of MOS tube is generally affected by the designer and transformer parameters. Infinion Micro high voltage MOS tube series can provide full-stage adaptive MOS tubes within 600V~900V for flyback topologies, and can also provide high BV devices for flyback auxiliary power supply of 600V~800V high voltage sources.

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