Any one work on AC to DC converter, without transformer

Hi team,
Any one work on AC to DC converter, without transformer,
If yes can you share me the components selection and calculation guidance.
Thanks in advance 🙂
Solution
https://ww1.microchip.com/downloads/en/appnotes/00954A.pdf take a look at this appnote. As @ShreeshaN says, these are non-isolated designs and suitable for low current applications only.
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