LM3478 problem

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dreaming
on 10/07/2008 at 11:43 AM

Category(s):	power.national.com
Subject:	LM3478 problem
Message: (Notified via email on every direct response)
Hi i have design a lm3478 with wide input and output range. my system work right for low input voltage , no matter what output voltage and load. I have weird output ripples (Attached) at Vin>certain values. The duty cycle remain more or less constant for a few cycles(Vout increase gradually) and it go to discontinous mode for a few cycles. The large ripple (formed by CCM and DCM) doesnt follow a fixxed period. Can u look at the attached pics and see whats the possible problem. PIC: Output ripple at AC and Switched Node Attached File - TEK00000.JPG

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TEK00000.JPG