Constant Voltage Power Supply Circuit LNK304

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LinkSwitch-TNcombines a high voltage power MOSFET switch with an ON/OFF controller in one device. ... circuit (LNK304-306) while over temperature protection.

lnk304 Power Integrations LinkSwitch 

LinkSwitch-TN LNK304 IC is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies 

https://www.eeweb.com/linkswitch-design-guide/

 Power Integrations LinkSwitch Key Parameters for an Initial LinkSwitch Design

https://www.power.com/products/linkswitch/linkswitch-tn2

https://www.power.com/zh-hant/community/forum/ac-dc-conversion-forum/2017/lnk3202d-high-side-metering

Термостат ARISTON TBSE CU70CG Блок питания на lnk304pn

Modul Controler digital Ariston TBSE Thermowatt spa Water heater

ESD 230v circuit AC input optocouplers  ESD protection opto isolator Optocoupler input protection 

https://sound-au.com/appnotes/an015.htm

https://sound-au.com/articles/overvoltage.htm