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230 V ac input, current feedback 350 ma power led driver?

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hi all. how do people produce small size power led drivers? i think they dont use transformers. how can i find power led driver s schamatic diagram? i search a driver which has like these properties:

Input Voltage :170-230 VAC
Outpu Voltage:3-5 Volt
Output Current: 350 ma

i will connect to driver just one power led.1 watt, 350 ma, 3 volt.
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