Designing a printed circuit board ( PCB) is a meticulous process that transforms an electronic circuit schematic into a functional physical board. It involves translating the electrical connections and component placements into a detailed layout that can be manufactured and assembled. To ensure the smooth execution of this process, designers usually choose reliable design software they are familiar with. One popular choice is CircuitMaker.
If you are a beginner, this article will be an essential read for you. TechSparks will provide a CircuitMaker tutorial using a buck converter as an example. Let’s get started!
Design Requirements and Specifications
For designing a buck converter using CircuitMaker, you first need to determine the input voltage range, specifying the minimum and maximum voltages that the converter will handle. Next, decide on the desired output voltage, which will be the regulated voltage supplied to the load. You also need to establish the maximum output current that the converter should provide, ensuring it meets the demands of your application. Target efficiency is another crucial aspect, as it influences the overall performance and thermal management of the converter.
Thermal management requirements should be addressed by determining if any heat sinks or other cooling methods are necessary to maintain safe operating temperatures. Additionally, consider any physical size and layout constraints for the PCB, ensuring the design fits within the allotted space. Protection features, such as overcurrent, overvoltage, and thermal protection, should be identified to safeguard the converter and connected components.
Components Requirements
To design a buck converter and select the appropriate components for the schematic, you’ll need the following:
- Input Voltage Source (Vin): This will be your power supply.
- Power Switch (MOSFET): A MOSFET such as the IRF540N or similar. This will act as the main switching device.
- Diode (Freewheeling Diode): A Schottky diode like the 1N5822 or similar. It provides a path for the inductor current when the MOSFET is off.
- Inductor (L): Choose an inductor with a suitable inductance value and current rating, such as a 47µH inductor with a 3A rating.
- Output Capacitors (Cout): Typically low ESR capacitors are preferred, such as two 100µF electrolytic capacitors or a single 220µF capacitor.
- Input Capacitors (Cin): These smooth out the input voltage; a 47µF electrolytic capacitor or similar can be used.
- Control IC: A PWM controller IC such as the LM2596 or similar. This regulates the switching of the MOSFET.
- Heat Sink: For the MOSFET if high power dissipation is expected.
- Bypass Capacitors: Small value capacitors (e.g., 0.1µF) close to the IC power pins for noise reduction.
If we look at the datasheet of the buck converter. It will show us the following components.
Create a Schematic Diagram
For the creation of schematics, we follow the datasheet schematics and start implementing the components on the CircuitMaker. But first, let us check the interface of CircuitMaker.
Place Section
It has important elements like
- Pads to place the copper area on the PCB.
- Via to drill the PCB hole size.
- To write any text on the PCB for branding and things remembering purposes.
- Line for wire purpose.
- Full circle of circular PCB.
Design Rules
In design rules we define the rules that we follow while making the PCB beside we also define rules that we don’t do and that should be prohibited while making the PCB.
Dimensions
In the dimension section, we check the dimension of the whole PCB the size of all the components and the distance of components from each other.
Components Selection
There is the library section where we select the components and place them on the schematic page.
Circuit Diagram
To make the circuit, we select the components from the library section and place them on the sheet. Now connect all the components with the help of wire. The final diagram of the circuit is given below:
PCB Design
Go to the project and then come the option import changes from buck.
This converts the schematics to PCB.
We arrange all the components on the board and then, by using the trace width calculator, we calculate the width of the wire. Now connect the components with all the wires.
The PCB via wire connection is given below:
The last step on the PCB side is grounding all the PCB. The grounding is done
- Select the polygon pour
- Select the copper region and connect to the net” GND” which is the name of the ground. And click the ok button.
- This is the complete circuit with all the ground planes.
There is also a 3D view of the board. Go to the switch to the 3D and the 3D view is open.
We again check the DRC error. If the error occurs we need to remove the error by resolving the quire. If it goes well then, we move toward the next step.
Necessary for PCB Fabrication
After the design is complete need to create some important files that are necessary for PCB fabrication i.e., Gerber file (contains all the footprints of the pcb), BOM (bill of material/all components and pcb cost), Pick and place file(used to locate the dimension of the placements of the components).
Ending
Designing a PCB in CircuitMaker involves several critical steps that ensure a successful and functional final product. Begin by defining the requirements and specifications, such as input voltage, output voltage, current requirements, and other performance criteria. Next, create the schematic diagram within CircuitMaker, placing all necessary components like resistors, capacitors, diodes, and ICs, and connecting them according to your design. Accurately label each component and verify all connections. Afterward, select components that meet your specifications and verify their ratings and availability. Proceed to design the PCB layout by arranging components on the board, routing the traces to connect them, and ensuring the layout adheres to design rules. Perform a Design Rule Check (DRC) to catch any errors or potential issues. Generate the necessary fabrication files, such as Gerber files, drill files, and a Bill of Materials (BOM). Finally, review the design thoroughly before sending it to a manufacturer for fabrication and assembly. Each step in this process is crucial for ensuring the reliability, performance, and manufacturability of the PCB.
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