Alternate 12V supply for RDR239 and DER394

Posted by: rffx on 06/02/2021

I am trying to reduce the component cost of the 12V supply that is used for a PFC 24V AC-DC converter.

Currently my design uses the LinkSwitch circuit similar to RDR-506 (TN2 LNK3204D/P/G) as an auxilary 12V supply for the PFC.

What less expensive alternatives do you suggest?

Thank you

Comments

Hi rffx,

Good day!

If you wouldn't mind, may I ask for the application and the standby power of your design?

Thanks.

Regards,

PI-Tarmo

Thank you, the application is a PFC corrected 24V 6.25A supply. Working -20degC to 75degC Also I see in the designs that the 12V has a seperate ground. Is the seperate ground necessary? If marrying the two reference designs may the grounds be connected together?

Please share the less expensive 12V and also draw the grounding configuration.

thank you

Hi rffx,

You can link the grounds together, but this is dependent on how you want to use your standby power. For your auxiliary 12V supply, the RDR-506 is already an excellent design. Instead of utilizing two diodes for the input rectifiers, I propose employing a single bridge diode.

Thanks.

Regards

PI-Tarmo