The isolated switching power supply circuit with a 5V, 2A output using the TOP414G is illustrated in the diagram. C1 serves as the input filter capacitor. VDz and VD1 form a primary-side clamping protection circuit to prevent voltage spikes from damaging the components. R1 is the control terminal resistor, while C2 acts as a bypass capacitor to stabilize the control signal. C10, connected in parallel between the TOP414GC-S terminals, helps avoid unintended triggering of the power-off circuit due to high-frequency noise at the control terminal.
VD2 functions as the output rectifier diode, and the output filtering is achieved through C3, C4, L, C5, and C6. Additionally, C9 is used to reduce output noise. The external error amplifier is composed of a shunt regulator, the TL431. When the output voltage fluctuates, the voltage is divided by R3 and R4, then compared against the reference voltage of the TL431. This generates an external control signal that adjusts the current flowing into the control terminal of the TOP414G via the optocoupler PC817A, thereby regulating the duty cycle and improving the stability of the output voltage.
The gain of the control loop is set by R2. The feedback winding voltage is rectified and filtered by VD3 and C7, which provides power to the infrared receiving element in the PC817A. This ensures accurate and stable feedback for the control system, enhancing the overall performance of the power supply. The design is efficient and suitable for applications requiring reliable and precise power regulation.
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