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How to optimize PCB layout to improve power module performance
The global energy shortage problem has caused governments all over the world to vigorously implement a new energy saving policy. The energy consumption standards of electronic products are becoming stricter and stricter. For power supply design engineers, how to design a higher efficiency and higher performance power supply is an eternal challenge. Starting from the layout of the power supply PCB board, this article introduces the best PCB layout methods, examples and techniques for optimizing the performance of the SIMPLE SWITCHER power supply module.
When planning the power supply layout, the first thing to consider is the physical loop area of the two switched current loops. Although these loop areas are basically invisible in the power module, it is still important to understand the respective current paths of the two loops because they will extend beyond the module. In the loop 1 shown in Figure 1, the current self-conducting input bypass capacitor (Cin1) passes through the MOSFET during the continuous on-time of the high-side MOSFET to the internal inductor and output bypass capacitor (CO1), and finally Return the input bypass capacitor.
Loop 2 is formed during the off-time of the internal high-side MOSFET and the on-time of the low-side MOSFET. The energy stored in the internal inductor flows through the output bypass capacitor and the low-side MOSFET, and finally returns to GND (as shown in Figure 1). The area where the two loops do not overlap each other (including the boundary between the loops) is the high di/dt current area. The input bypass capacitor (Cin1) plays a key role in providing high-frequency current to the converter and returning the high-frequency current to its source path.
The above is the introduction of how to optimize the PCB layout to improve the performance of the power module. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.
