When talking about power, the priority is usually to get more of it. As teenagers, we wanted the most powerful cars, cities always need more electrical power for their populations, armies need more military power, and the space race pushed the limits on building more powerful rockets. Printed circuit boards also need more power, but their priorities are a little different. The goal of a successful PCB design is to provide it with clean power.
The power supply you create on your PCB design needs to provide the rest of the circuitry with clean, uninterrupted power. You need to design the power supply so that it creates as little noise as possible, and the noise that it does create will be isolated from the rest of the design. You also must consider how the heat that the power supply will create will affect the circuit board, and design for it accordingly. Lastly, you also need to understand how your design will affect the manufacturing process of the board. Here are some power supply PCB design guidelines that can help.
Whatever the purpose of your printed circuit board is, it will need power to function. Typically, this is accomplished with an onboard power supply. Power supplies are broken up into two main groups according to their operation:
SMPSs are further divided by type: isolated and non-isolated. Higher-input voltages require the use of transformer isolation. There are many isolated SMPS variations, depending on their function and power rating, including flyback, forward, push-pull, half bridge, and full bridge. Non-isolated SMPSs include the following types:
Whichever power supply type and configuration you end up using on your board, it must be designed to deliver clean power with as little noise as possible. To that end, there are some considerations that you should keep in mind when designing the power supply on your PCB: