Design example of flyback switching power supply control loop based on UC3844

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

1206 red anti-stick

Summary:

In the design of the switching power supply, the design of the control loop is very important, and the design of the control loop can determine the success or failure of the power supply. The switching power supply has two control modes: current control mode and voltage control mode. The transfer function of the power system varies greatly depending on the control method, so it should be separated separately during loop design analysis. This paper designs and analyzes the switching power supply control loop based on UC3844. A general approach to the design of switching power supply current mode control loops is discussed.

Uc3844 internal structure

Feedback control loop circuit of current control mode double-tube flyback switching power supply

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