I want to desgin a 5V,0.5A transformerless supply (minimum components) for mains 100-260Vrms, 45-65Hz?
I found several ways to do it which are mentioned below
1. resistive power supply - Microchip AN954
2. capacitive power supply - Microchip AN954
3. using dc-dc converter - using NCP1200 pwm
4. using capacitive voltage divider after rectifier
Which method should i adopt? (what about capacitive voltage divider)
Answer
Transformerless power supplies are not suited for 0.5A output at 5V even disregarding safety - cost and performance would be inferior.
Use a flyback supply like everyone else in the world.
You can consult Power Integrations data or look into self-oscillating converters with tiny transformers.
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