Thank you all for the replies.
Bellow is what i did to try reducing the input ripple.
- I added polypropylene caps up to 10 uf and doesen't make any difference.
- I adjusted the switching frequency from 150 Khz to 400 Khz but with no luck.
- I boosted the input capacitance up to 3300 uF and the input ripple had the same value.
With all this changes the ripple amplitude and frequency remained the same, something is terrible wrong with my converter.
At 5A output current nothing heats up, converter works just fine only the input ripple problem.
I'm going to do the math again and redesign the power stage.
One thing, for powering the converter i use a AC-DC SMPS 24V 16A (i don't have a 24v battery at home), to be this the problem?
I ask because i put a 3A load on this power supply and i checked the ripple and it looked pretty much the same (170 mVpp and 800 Hz)
# diyaudio
1 - For tests i don't have a dedicate pcb (the power stage is build on a prototype pcb)
2 - I'm using resistive load
3 - Controller is TL5001 and i'm using type III compensation network
4 - I need to study this
5 - it's an arnold ring core MS-090075-2 with 12 turns (wire: 10x0.25 mm)
I used this document to calculate the values:
http://www.irf.com/technical-info/appnotes/an-1162.pdf# Phoenix
I'm worried about low frequency ripple, attached you find how to design a snubber circuit.
Thank you all for helping me