I had no problem with soldering whatsoever.Īs it is clear in figure 8, I have modified some parts of the circuit to achieve lower noise, so the provided Schematic and PCB are the latest versions. The PCB board has been fabricated by the PCBWay, which is a high-quality board. Figure 5 and figure 6 show 3D views of the PCB board, from the top and bottom.įigure 7 shows the first prototype (first version) of the board. This is the last revision of the PCB board. Selected component (IC1) from the SamacSys Altium plugin PCB layout of the DC to DC buck converter You can search and install/use the passive components libraries as well.

I use the Altium Designer CAD software, so I used the SamacSys Altium plugin to directly install the components libraries. I used the SamacSys component libraries (Schematic symbol and PCB footprint) for the IC1 because these libraries are free and more importantly, they follow the industrial IPC standards. It’s a small (2.1cm*2.6cm) two layers board. The highest efficiency for almost all input voltages has been achieved at around 1A.įigure 3 shows the designed PCB layout. R3 and C3 are related to the bootstrap circuit and determined according to the datasheet.įigure 2 shows the efficiency vs output current plot. The R1 value has been set according to the datasheet. R6 limits the current flow to the EN pin. The cut-off frequency of this filter is around 1KHz. L2, C5, and C7 make an additional output LC filter that I added to reduce the noise and ripple. L1 and C4 are the essential buck converter elements. R2 is a 200K multiturn potentiometer to adjust the output voltage. R2, R4, and R5 build a feedback path to the chip. Full protection features include OCP and thermal shut down.” Low RDS(on) allows this chip to handle high currents.Ĭ1 and C2 are used to reduce input voltage noises. Current mode operation provides a fast transient response and eases loop stabilization. The MP2315 has synchronous mode operation for higher efficiency over output current load range. It offers a very compact solution to achieve 3A continuous output current over a wide input supply range with excellent load and line regulation. Schematic diagram of the DC to DC buck converterĪccording to the MP2315 datasheet: “The MP2315 is a high frequency synchronous rectified step-down switch-mode converter with built-in internal power MOSFETs. The main component is the MP2315 step-down buck converter. In this article, we will learn to build a small, efficient, and cheap buck converter circuit.įigure 1 shows the schematic diagram of the device. A tiny DC to DC buck converter board is useful for many applications, especially if it could deliver currents up to 3A (2A continuously without heatsink).

Uc3843 24v 3a