Hi,
I designed one of our power circuits with the help of WEBENCH Designer.
Vin: 24VDC
Vout: 12VDC/10A
Device: LM5116MHX/NOPB
WEBENCH Design#: 1104891/58
http://webench.ti.com/appinfo/webench/scripts/SD2.cgi?ID=164736::power::dkong@rheosense.com
I used exactly the same components as specified in the BOM
When I got the board, the output voltage looked ok, When I probed the switching node, I expected nice 50% duty waveform as the simulation, but I could see 'sub-harmonic oscillation" and ringing as the pictures in the attached file. I tried different resistors for slope compensation, but it didn't work.
Could you take a look at my design and give me some clues to solve this problem, please?
Best regards,
DennisSchematic_DC-DC_Switchers(ver.C).pdfRheoSense_SubharmonicOscillation_LM5116.pdf