LM3478 ringing problem

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Reply to "LM3478 ringing problem"

jonathan.brodeur
on 03/24 at 07:16 PM

Category(s):	Technical Questions, power.national.com
Subject:	LM3478 ringing problem
Message:
I'm using the LM3478 in SEPIC. My design is based on the app. note AN1484. Input 5-22V, output 12.5V, 0.1 to 1.25A. I'm running at 400 kHz. I've got a ringing signal at the output every 400kHz with very high amplitude (1V peak). The ringing is around 50 MHz. Do you have an idea about my problem. Every time the mosfet turn ON or OFF, i've got that ringing signal. Attached File - supply lm3478.JPG

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supply lm3478.JPG