TPS54232 - Ringing noise
Hi everybody,
i've recently designed a 3.3V 2A step-down (6-12V IN) with the IC tps54232 but I have a problem with the output noise. I've got this pretty bad ringing noise around 1Mhz (I guess it's when the mosfet open/close).
Noise at 7.5V Input and 20Ohms load:
I wonder if my inductance is sufficient enough but i do the math and i'ts should be ok ( specs ). Or it may be my layout but i've fallowed the TI layout pretty much.
It's just the top side, the bottom is a ground plane.
And finally my scheme:
B.O.M : http://www.digikey.ca/short/7bdt48
Thanks! And sorry for my english it's not my primary language.