Essential Steps for Designing a High-Quality PCB for Switching Power Supplies

1. Schematic to PCB Design: The transition from schematic to PCB design is crucial for a successful outcome. Ensure proper component parameters, netlist creation, parameter settings, manual layout, routing, design verification, review, and CAM output.
2. Parameter Settings: Pay attention to trace spacing for safety and ease of production. Maintain adequate spacing for electrical stress handling, especially for high and low-level signals. Use tapered connections for thin traces connected to pads to prevent defects.
3. Component Layout: Proper layout is essential for optimal performance. Incorrect placement of traces can lead to delays and noise issues. Follow best design practices to avoid performance degradation.

4. Current Loops in Switching Power Supplies: Understand the four main current loops in a switching power supply, including power switch AC circuit, output rectifier AC circuit, input signal source current loop, and output load current loop.
5. Importance of Filter Capacitors: Filter capacitors play a crucial role in storing energy and filtering out unwanted components. Proper connection to the power supply through capacitor terminals is essential to prevent EMI issues.
6. Minimizing EMI: High-amplitude trapezoidal currents in power switch and rectifier circuits are prone to EMI. Routing these AC loops before other traces is critical to reducing electromagnetic interference.
7. Component Placement: Place filter capacitors, power switches, and inductive transformers close together to minimize current paths and optimize performance.