PWM flyback switching power supply circuit based on FAN6754A

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Based on the FAN6754A PWM flyback switching power supply circuit, the working characteristics and principle of the new peak current type PWM control chip FAN6754A are introduced. The design principle and working process of the flyback switching power supply are analyzed. A new type of flyback switching regulator power supply is designed for the secondary circuit structure. The transformer design process of the flyback switching power supply is introduced, including the calculation of the inductance value, the selection of the core, the determination of the winding turns and the air gap. The three-terminal regulator TL431 is used with FAN6754A to realize the control of the power supply voltage and the regulated output. The optocoupler device is used to isolate and feedback the input/output. Thermistor and overvoltage and overcurrent protection are added to the power supply circuit. The experimental test results show that the designed power efficiency is close to 89%, the voltage regulation performance is excellent, the ripple is small, the voltage regulation rate and the load regulation rate are high.

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