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I am using a small circuit which needs 5V DC input and total current consumption of the circuit is 300mA. I have been using the small size ac to dc converter modules, but now i am searching for a small size IC which will do the AC To DC conversion. I have been looking all over internet i have found LNK586xx IC but due to lack of Electronics knowledge i could not find the usage circuit for it and unable to understand the usage.

My question is , Is there are other IC which does the required thing. I am looking for a guidance on this issue. My basic requirement is to make the power circuit most compact than what i am using right now. I am using HLK-2M05 Hilink module. Link to device which i am currently using . https://datasheet.lcsc.com/szlcsc/1912111437_HI-LINK-HLK-2M05_C209909.pdf

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    \$\begingroup\$ Welcome to EE.SE. You need to write a better specification. (1) What is the AC voltage? (2) You have specified 300 mA out at 5 V. How much ripple can you tolerate on the 5 V output? (3) "... to make the power circuit most compact than what i am using right now." We don't know what you're using right now. \$\endgroup\$ – Transistor Mar 1 at 17:38
  • \$\begingroup\$ Make it more compact than what.... let’s see if I can find my crystal ball. Better still define what you mean and remember that shopping questions are off topic. \$\endgroup\$ – Andy aka Mar 1 at 17:40
  • \$\begingroup\$ I think you are slightly out of your depth, AC to DC offline conversion can be dangerous and requires a decent amount of design even with the best IC chips. \$\endgroup\$ – MadHatter Mar 1 at 17:44
  • \$\begingroup\$ @Transistor : hi . i am using HLK-2M05 HiLink module. How much ripple can you tolerate on the 5 V output <- i am unaware of these details in electronics due to lack of knowledge and no background of electronics. \$\endgroup\$ – java bee Mar 1 at 17:50
  • \$\begingroup\$ @MadHatter Thats the guidance i am looking for. \$\endgroup\$ – java bee Mar 1 at 17:51
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Regarding the usage circuit of the LNK586, you find it on page 4 of the datasheet and I copied it here:

Usage circuit

The blue part is a rectifier (AC to DC), the orange part is the IC which forms the control part of a DC/DC convertor (green part)

Regarding your second question: You can find many ICs that make the same thing (control a DC/DC convertor), however, to design an offline (direct from AC mains) power supply is not trivial at all. To get a circuit that is significantly more compact that the module you’re currently using would be extremely challenging: most of the space in your current solution is most likely used by the passive components, to reduce them you would need to increase the switching frequency of the DC/DC convertor but that would increase the switching losses in the power transistors and magnetic components at the same time.

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You can use the Texas Instrument tool to design your AC/DC converter.
WebBench TI : https://webench.ti.com/power-designer/switching-regulator

In the option of the design consideration, choose small footprint .

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