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@ramkumarr1511 You just need a X reted capacitor and a resistor
This article talkes about it
Take a look
https://circuitdigest.com/electronic-circuits/transformerless-power-supply#:~:text=And%20yes%2C%20we%20can%20also,specially%20designed%20for%20AC%20mains.
You can look up High voltage Buck convertors, but these are for low current application only
https://ww1.microchip.com/downloads/en/appnotes/00954A.pdf take a look at this appnote. As @shreeshan97 says, these are non-isolated designs and suitable for low current applications only.
https://www.ti.com/lit/ug/tidu856c/tidu856c.pdf and a TI reference design
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