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Found 2 results

  1. The key part of any electronic device is the power supply. Any instability or malfunction of the power supply part causes the device to stop working or demonstrate weird behavior. In this article/video, I introduced an AC-to-DC flyback Switching power supply that converts 85V-260VAC to 5VDC-2.5A, which can be used in various applications. The 5V selection for the output makes it friendly for linear regulators that convert 5VDC to lower voltages. The maximum power delivery of this power supply is around 12W, which means it can handle 2.5A at 5V output. The controller chip is DK1203, which does not need any external supply, a startup resistor, or an auxiliary winding on the transformer. The ferrite core of the transformer is EE20. A potentiometer allows you to adjust the output voltage and set it exactly at 5.0V. To design the schematic and PCB, I used Altium Designer 23 and shared the PCB 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 board for voltage drop, current delivery, and output noise. I used Siglent SDL1020X-E DC Load and Siglent SDS2102X Plus oscilloscope to perform all tests. I am confident that building this circuit enhances your knowledge regarding switching power supply design, except for using it for real applications. Schematic + PCB + Transformer: https://www.pcbway.com/blog/technology/85V_260VAC_to_5VDC_2_5A_Flyback_Switching_Power_Supply_b7f49beb.html References [1]: DK1203: https://grupoautcomp.com.br/wp-content/uploads/2016/11/Specification-IC-DK1203.pdf [2]: 500mA Fuse: https://octopart.com/39211000440-littelfuse-39590771?r=sp [3]: 07D471 Varistor: https://octopart.com/mov-07d471ktr-bourns-19184728?r=sp [4]: 100nF X2: https://octopart.com/r463i310050m1k-kemet-50550056?r=sp [5]: UU9.8 Choke: https://octopart.com/7355-h-rc-bourns-12614152?r=sp [6]: MB6M Bridge: https://octopart.com/mb6m-e3%2F45-vishay-42761003?r=sp [7]: 22uF-400V: https://octopart.com/eca2ghg220-panasonic-3578224?r=sp [8]: RS1M Diode: https://octopart.com/rs1m-13-f-diodes+inc.-333072?r=sp [9]: PC817 Optocoupler: https://octopart.com/pc817xnnsz1b-sharp-80823687?r=sp [10]: TL431 Shunt: https://octopart.com/tl431acdbvr-texas+instruments-521839?r=sp [11]: SS54 Schottky Diode: https://octopart.com/ss54-multicomp-18903925?r=sp [12]: 470R-1206: https://octopart.com/cr1206-jw-471elf-bourns-3872844?r=sp
  2. The high temperature of the power components is a known phenomenon in electronics. To overcome this challenge, the designers mount heatsinks on the components to dissipate the heat, however, in many commercial and home appliance devices, the embedded heatsink is not adequate and the air must be circulated faster to reduce the heatsink and component temperature, otherwise, the lifetime of the component is reduced significantly. The proposed automatic FAN controller board is simple, compact, and can be embedded inside commercial devices. The LM35 temperature sensor could be fixed on the heatsink using some silicon glue. The user can easily set the temperature threshold using a potentiometer. The board can be supplied using a 5V or a 12V supply, therefore a variety of 5V, 12V, miniature, and PC FANs can be used. I used Altium Designer 21 and SamacSys component libraries (SamacSys Altium plugin) to draw the schematic and PCB. Except for the connectors, all components are SMD and easy to solder. References Source: https://www.pcbway.com/blog/technology/Cooling_FAN_Controller_using_an_LM35_8d3d76cb.html [1]: LM358 datasheet: https://www.st.com/resource/en/datasheet/lm358.pdf [2]: SI2302 datasheet: https://www.vishay.com/docs/63653/si2302dds.pdf [3]: LM358 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/LM358D/STMicroelectronics [4]: Si2302 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/SI2302DDS-T1-GE3/Vishay [5]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [6]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions
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