My knowledge of electronics is pretty basic so I'm really after an off the shelf component rather than building my own circuit. I have located a small self contained PCB mount SMPS which seems to be available at a reasonable price. It actually seems a bit too straightforward given the normal size and components of a PSU. There is a choice of wattage and voltage to meet requirements.
sample device synopsis...
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over power, over current and short circuit protection
17g PCB mounted
3600Vrms primary to secondary isolation
-25°C to +70°C operating temperature (full load)
low ripple and noise and >74% efficiency
Output 5V DC
Input 90 to 264V AC, 47 to 63Hz
Ultra-compact size
Single 3W regulated output (5-pin)
Low standby power <0.3W
Encapsulated design
Materials UL94-V0
Safety rated EN61558, EN60950, CE, UL
Dimensions 24 x 23 x 19mm
There was no reference circuit and it basically looks ready to use (connect mains to input and use dc direct from output) but as I don't design circuits I'm wondering if there should be any additional circuitry to make it work reliably / safely / properly etc?
I did spot an IEC with a built in EMI filter but I assume that is an optional part of the circuit anyway?