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power supply design.

I have to design a AC/DC power supply with specifications as follows: -

Requirements:  -

Input : 90 - 230 VAC.

Input Frequency : 400Hz.

Output :  18V , 20 Watts.

Constraints: -

Power Factor - above 0.95.

Isolated flyback topology.

Efficiency: 80-90%.

So, I'm looking for a two stage process i.e. 

1) PFC stage.

2)Flyback stage

So, can you recommend separate IC's for these two stages, as I will be integrating both together to achieve both PFC as well as Flyback.

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