Hey guys,

I used the LNK306 to create a 5.0V rail on my PCB. (120VAC input). I used the datasheet to come up with the component values.

The problem is that I am getting a 10.4V output instead of the desired 5.0V. I double checked the feedback resistors, and they are 2K and 3.84K which should generate the desired 5.0V output.

Has anyone had any experience with these line of IC's? I attached my circuit schematic, and the PCB layout of the circuit. Any help would be greatly appreciated as I am at a loss as to what might be wrong, or how to go about finding the problem, thanks!

Here are the part #'s I am using for the Inductors, Diodes, and Capacitors:

D1, D3: DFLU1400-7

D2: US1JHE3/61T

D4: FM4007W-W

L1, L2: 46105C

C4: GRM219R61E106KA12D

C6, C7: 475CKE450MLN

C8: 35ZLH100MEFC6.3X11

R3: WP2S-7R5JA25

 

Power Integrations makes this IC. They have a forum- link below. You could also try asking there.
https://www.power.com/forum/

 

Power Integrations makes this IC. They have a forum- link below. You could also try asking there.
https://www.power.com/forum/

I already have a topic posted there as well ;-)
They have terrible customer service though so I wasn't holding my breath. I figured it would be more worth while to see about getting advice here instead.

 

Can only suggest altering the resistors feeding the fb pin, to see if it changes the voltage, never worked with this chip.

 

Hello,

Did you read the User Agreement ?
In point 6 the restricted topics are mentioned.
Transformerless powersupplies is one of them.

Bertus