Platform for creating and sharing projects - OSHWLab

Hello! To answer on your question about what is the most suitable PSU module depends always on your devices that you have on board. And also if your device is battery operated or not. If your device don't have a battery, then I would go with buck regulators if your typical load currents exceed over 1A. Otherwise sticking with a LDO with proper heat sinking would be just fine. If your device is battery operated with one cell architecture, then you need buck-boost converter. Regulator such like TPS63060DSCR is one of the best ones out there. I have a few open projects about this regulator, you can check it out if you want. For noise sensitive sensors I would go with LDOs or with a heavily filtered switching regulators. If you have a low budget, then I would stick with that LDO because you often needs coils, ferrites, capacitors and all such filtering components to get acceptable noise levels out of a switching regulator. Usual reason why your voltage drops in heavy load is that you may use too thin track width on your power traces or inefficient compensation on the regulator side. Some intelligent regulators are able to compensate very well to adjust their voltage levels and keeping them steady on high load situations. It all comes to budget. If you want stable regulation in high load, you don't use any "jellybean" regulator, you use certain more intelligent regulators for that and there is a good price range for those. The way you calculate a proper output current rating is always 50% more on top that you have on continous load. So, if your project uses 500mA, then you find a regulator that can output at least 750mA or more. 1A is good enough too. I wouldn't consider too much on peak currents. What you need to consider is to add a good amount of decoupling capacitance on those areas of the board where this peak current phenomena happens. So if a sensor is performing a sampling or taking a measurement, that uses more current. This means you put several microfarads of decoupling for that sensor. The amount of decoupling is usually governed by certain standard in the industry. Its all about how much peak to peak noise you want to reduce on the output of a switching regulator. And because all regualators produce different amount of noise, then there is no "universal" guidance on how much decouoling you need. You need to measure it and add more capacitance until the required noise level is met. But you can't go wrong with 10uF and 100nF combo in most cases. The best practices to avoid noise is to make the best PCB layout as possible. That means alot of ground vias placed strategically on those places where there are antenna areas(large and long strips of copper with no grounding via at their end). The second methods are using filter components, CMCs, ferrites and feed through capacitors on your power supply rails. As a summary, all this PSU design is dependent always on the target application. The application itself sets the regulatory industry standards and the PSU is designed so that it meets those standards and limits. So getting further answers requires me to know the target application that you are trying to design. Let me know if you want further information if you wish to disclose more about your product. Regards, Markus Virtanen HW / Electronics Designer

Hello, you can view it in the properties panel on the left.[Picture]

Is this the project you asked a PSU guidance in your previous post?