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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.

Parents Reply
  • Hey Vineet,

    In addition to the ADP1047/ADP1048, Digital PFC Controller with AC Power Metering that Fil suggested, I would recommend checking out the LT8312 Boost Controller with PFC. This part boosts the rectified AC input to a higher voltage and modulates its peak current limit with a scaled version of the input voltage to achieve power factors of 0.97 or greater.

    This part targets high power designs and is commonly combined with the LT3752-1 Forward controller, but it could be combined with the LT3798 with internal PFC disabled, LT8315, or LT8316 flyback controllers.

    Best Regards,


  • Hi Eric,

    I already went through these IC's (LT3798, LT8312, LT8315 & LT8316), among these LT8315 can't be used for my application as it is having an integrated mosfet. 

    However LT8316 is Primary side regulation based IC due to which, it's transient response won't be that good as compared to Secondary side regulation based IC's.

    So, l can use LT8312 for PFC boost, but can you recommend any IC for flyback which will employ the SSR technique ?



  • Hi Vineet,

    Check out ADP1071-1. That sounds like the perfect part for you. You might be able to get the LT3825 to work as well, although it usually targets the 36V to 72V input range.

    Best Regards,