Hi there
For an Smart Home application I'm looking for a small Transformer-less AC to DC design. There are plenty of designs but I'd rather the smallest one cause I want to implement it into a wall light switch somehow. And od course some if these designs are not too good for long term uses and they're not that much safe and or stable. So it has to provide a safe and stable voltage considering I'm using it for a Zigbee wireless controller.
Input voltage is 220V AC and the output voltage is 3.3V/100mA DC (for my board which is a CC2530 Zigbee based controller) although 5V is good enough and I can use another LDO to convert that to 3.3V. I don't need that much output current.
Normally I don't care if it's non-isolated or isolated but I think I have to go with non-isolated because of its much smaller size and the fact that it doesn't use a Transformer.
But I don't know if it's a good idea to use a non-isolated power for wireless controllers like CC2530. Is it?
I saw this but it seems kind of big because of those two inductors and some other components.
So do you guys have something better in mind?