As a Manufacturing Process Engineer for printed circuit board assemblies (PCBA), your primary role is to develop and document manufacturing processes for electronic assemblies which yield reliable high-quality assemblies at the lowest possible cost. To reduce the ripple of switching power supply in pcb assembly, we must work hard in the following three aspects:
Energy storage inductor
The larger the Q value of the energy storage inductor at the operating frequency, the better. Many people only pay attention to the inductance. In fact, the influence of the Q value is much greater. As long as the inductance meets the requirements, it is allowed to fluctuate in a wide range.
Filter capacitor
The ESR and ESL of the filter capacitor are very important parameters. The lower the better, the pursuit of capacity alone is far from enough. Of course, on the premise of meeting sufficiently low ESR and ESL, a larger capacity is better. The filter capacitor of the switching power supply is preferably a combination of X7R or X5R capacitors and tantalum electrolytics. The ripple can be slightly relaxed by using Y5V capacitors and aluminum electrolytics (low ESL type) with a thin and tall appearance.
PCB design
The PCB design of the switching power supply is very important. When the first two conditions are met, if the ripple parameter still does not reach the value stated in the manual, the problem can definitely be on the PCB, the sampling of the switching power supply chip and the filter circuit. The design is very particular. PCB distribution parameters will lead to adjustment errors or poor filtering efficiency. In severe cases, it may even lead to self-excitation (usually occurs under a specific load intensity), so it has to be checked. The principle is that the sampling loop and filter loop should be as close as possible to the switching power supply IC, and the PCB wiring should not be too long or too thin. The same principle applies to similar energy storage inductors, but the impact is slightly smaller. Unfavorable layout and wiring are equivalent to reducing the Q of the inductor. value.
The last thing to say is that because of the different internal circuit design of switching power supply IC, the ripple index is also different. In most cases, it is easy to obtain lower ripple with high switching frequency, but the price and the requirements for peripheral components are relatively higher. Therefore, it is necessary to choose reasonably according to the needs, as long as it is enough, otherwise unnecessary costs will be paid. Careful reading and understanding of the device manual is the first step.
Read more: How to Reduce Ripple of Switching Power Supply?Best seller SMT Machine :Qihe smt line products
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