MP8008 POE feedback circuit

DC-DC Power Converters
1

Hello,

I am working with the MP8008.
I have copied the reference design with only a slight modification to the inductor and feedback network with the intent to increase the output voltage.
I am using the 750314782 from wuerth. The converter should run at (aproximately)
(Power, Duty, Ip, Fs) = (24, 0.5339805825242719, 1.8727272727272726, 369905.20542221935)

The problem I am seeing is that the ouput is well regulated but way too low.
I seem to have messed up the calculation of the feedback network.
Can you provide example calculations for just the feedback network?

Best Regards

2

Hi Max, welcome to the forum!

Sorry for the delay in getting to your question. Can you please send me a schematic of your application?

What voltage is the desired set point, and what are you measuring?

3

The issue has since been resolved. The problem was ultimately a faulty diode. It was very strange and I had never seen it before. Hence my confusion.

cm2
cm22550×3300 279 KB

Output voltage is 50V. This voltage is used to charge a capacitor bank with a CC buck regulator. It serves as a sort of UPS for other equipment on the board. Works like a charm :slight_smile: