Other Parts Discussed in Thread: LM5181, LM5180
Tool/software:
Dear support,
i used calculator to help me with the design (see attachment) and then i did some tests on EVB.
As you will see, i have 5V input voltage and i need 3.3V: i changed flyback transformer and i mounted 750319117 (from Wurth Elektronik, i worked with their experts in order to select the best PN according to my application). According to calculator, when the load is 120 mA, switching frequency should be 350 kHz ( so i should work in DCM) but i am measuring 209 kHz actually (see picture below, where i show you the swithcing voltage on TP3).
Can you help me with this?
Thank you.
BR,
Giorgio
0336.LM(2)518x PSR flyback converter quickstart tool revB.xlsx