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I am using a 5 Watt PCB mount AC/DC power module with universal input(85-264 V) and output as 12 V. The cost of the module is very high so thought if we could replace the module with a PCB mount transformer which will convert 230 VAC to 12 VAC and then a rectifier with a linear regulator can be used for 12 VDC output. I cannot decide the VA rating of the PCB mount transformer size. I did some search and found that I need power factor for getting VA rating. How can I get power factor? I have space constraint on my PCB so I cannot go for a very big transformer. Please suggest a solution. I am new to electronics so please excuse me for my ignorance.

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  • \$\begingroup\$ What is your current requirement at 12V? \$\endgroup\$ – marcelm Oct 29 '18 at 10:26
  • \$\begingroup\$ 400 mA is the current requirement \$\endgroup\$ – Ankit Kumar Oct 29 '18 at 18:13
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I did some search and found that I need power factor for getting VA rating.

No, power factor has no influence on the VA rating. If your DC load is less than 5 watts then you can use a transformer that is capable of providing more than 5 VA usually. I would be tempted to go for something that is more like 10 VA but this may be too big for your needs.

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