Replacing LNK304 with LNK306
Hi everyone,
First I'm sorry for this post I'm quite sure this topic has already been posted in the past. But I have a very short time to design a 15 [V] 200 [mA] continuous voltage source, I have no time to read all the existing topics...
I had a look at the LNK302/4/5/6 datasheet, and I saw the "1.44 W Universal Input Buck Converter" on page 4. This application example is built around the LNK304, which is able to drive a max of 120 [mA]. If I use this example with the LNK306 (225 [mA]), same other components values but adapted to 225 m[A] output, will this example work?
Another question: Is output voltage only fixed by Rfb (Feedback resistor)? if I want to change this example from 12 [V]output to 15 [V], do I only have to change Rfb from 13K to 15.29K(an37, application note)?
Thanks a lot for your answers.
Comments
Thank you very much for your answer. I'll do it like this.
When done, I'll post the results.
Jean-Philippe Rey
This question is on the same product reference DER-58 and DI-124.
Can I get PI Expert to model StackFET circuits like these?
Hi Karmen Fox,
Thank you for showing interest on PI products. With regards to your inquiry, we're sorry to tell you that we don't have an existing PI Expert model with very high input VAC design. If you want to check the inductance you need for this kind of design, you may try use the PI XLS option. You can input a very high input VAC, just ignore the warning for VDS max. Thank you.
Best Regards,
PI-SevenofNine
The output voltage and current went up to 15V_200mA, and it requries to have fullwave bridge instead half wave bridge rectifier.
Also the output capacitor voltage rating needs to be changed from 16V to 25V.
To change the output voltage from 12V to 15V, it requires to change Rfb to 15.3k as you mentioned.