Hey all,
I am looking for a small footprint flyback design for 220V to 5V. As the devices in question habe to provide 5V to relays, pumps or other mechanical stuff, and i don’t want to design a new power supply for each of them, I need something with at least 1.5A power output.
20ish years ago, while I still worked in this field, I would have been able to pick a reference design list by ST or TI, look for input and output, and then just order the parts including the Würth transformers.
Nowadays you have to use the design tools, and the number of designs there with a commercial transformer type is very limited and more often then not provide just wrong parts (choosing a 0.5A transformer if 1.5A are requested, or a 12V/5V transformer even if I need only 5V).
Würth provides parts specific for TI and ST, but if I select the exact chip in those vendor tools, I get completely different ratios.
Has anyone a good design he can share or some tips for an old electronics journeyman, who has forgotten half of that stuff he learned?
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The Hi-Link (beware of fakes) modular switchers work well for simple “ESP8266 + Relay and a couple of LEDs” designs - there’s a 5V 3W unit that just has enough headroom and it’s very compact. That gives you a black box, PCB mount option.
Why not find a USB charger that can handle the current? It looks like finding a 2A charger is easy these days (plenty of results on a quick search). They tend to be pretty small, also.
Because those devices may have a power line but not always an outlet in reach. Some of them will be put behind Walls or ceilings
Fair enough. I’m one to avoid my electronics directly touching mains, ce compliance for electrical safety is a pain, but also the bare minimum to not worry about it at night.
I feelings confident I’m building devices that are connected to main. I have extensive training und practice for this, but yes, in general for most hobbyists, I would not recommend this