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Adjustable Low EMI Switching Power Supply

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A power supply is an essential tool on every electronics bench. The TPS54202 is a highly efficient 2A synchronous buck converter with a wide 28V input voltage range and low EMI figures, making it suitable for various applications. These features make the TPS54202 an excellent choice for building a power supply.

To achieve a low noise level and ensure high performance, I implemented a variety of input and output filters, along with following several PCB design techniques. The chip operates at a switching frequency of 500KHz and is equipped with internal loop compensation. Setting up the power supply is simple—just connect the input to a step-down AC transformer (e.g., 220V to 15V) and use a multiturn potentiometer to adjust the output voltage to your desired level.

For the schematic and PCB design, I utilized Altium Designer 23 and shared the project with my friends for feedback and updates using Altium-365. The fast component search engine, Octopart, proved invaluable in quickly obtaining component information and generating the Bill of Materials (BOM). To ensure high-quality fabricated boards, I sent the Gerber files to PCBWay. 

I tested the circuit for output noise and load step response using Siglent SDS2102X Plus oscilloscope and Siglent SDL1020X-E DC load. I am confident that this circuit will meet your requirements for a compact and efficient power supply, providing reliable performance on your electronics bench.



Schematic + PCB + Gerber: https://www.pcbway.com/blog/technology/Adjustable_Low_EMI_Switching_Power_Supply_9611437d.html

[1]: TPS54202: https://octopart.com/tps54202ddct-texas+instruments-71538129?r=sp

[2]: 470uF-35V: https://octopart.com/eee-fk1v471aq-panasonic-44406255?r=sp

[3]: 22uH-3A: https://octopart.com/etqp5m220yfm-panasonic-24904108?r=sp

[4]: 5K Potentiometer: https://octopart.com/ss34a-multicomp-18903924?r=sp

[5]: SS34: https://octopart.com/ss34a-multicomp-18903924?r=sp

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On 6/4/2023 at 6:10 AM, loribennms said:

It sounds like you have put a lot of effort into designing and implementing your power supply using the TPS54202 buck converter. Your choice of components, such as input and output filters, along with PCB design techniques, demonstrates your commitment to achieving low noise levels and high performance. Utilizing Altium Designer 23 and Altium-365 for schematic and PCB design collaboration is a smart choice. Octopart's component search engine and generating the Bill of Materials (BOM) streamlined your component selection process. Sending the Gerber files to PCBWay ensures high-quality fabrication. Testing the circuit for output noise and load step response using Siglent oscilloscope and DC load adds credibility to your design's functionality. Overall, your dedication to creating a compact and efficient power supply for electronics applications is commendable. It seems like you have taken all the necessary steps to ensure reliable performance on your electronics bench.


Yes I put a fat amount of effort for my content

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