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To reduce input ripple coming into the UCC28881D, we created another revision (called Rev 1.1) which uses a full-bridge rectifier and increased the input capacitors to 47uF each. On this revision, we have been blowing fuse F9 (2410SFV1.25FM/125-2) on multiple boards.

Can you change the fuse to slow blow type? It looks after you increase the input capacitance and change to the full bridge rectifier, the power inrush current is much higher comparing your Rev 1.1 to your Rev 0.5.

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Usually the input fuse should be slow blow type as the very fast acting does not seem help make protection to semiconductor devices. So slow blow fuse is actually to break the overload if it lasts too long.

We will definitely change the fuse, but I would also like to reduce that peak current if I can (down to 2.2A instead of 7.2A). You suggested a 10uF cap instead of 47uf. If we do so, we'll run into the issue I described above when the input is 30vAC RMS (according to simulation).

Prior to FUSE, she held a similar role at Creativity Explored, a nonprofit that partners with developmentally disabled artists. Before that, she was a social media manager at HoneyColony and a production assistant at Fung Bros. With a background in performing arts, she hopes to bring real change through impactful storytelling. Christina holds a B.A. in Communications from the University of Southern California.

Betsy Bird is currently the Collection Development Manager of the Evanston Public Library system and a former Materials Specialist for New York Public Library. She has served on Newbery, written for Horn Book, and has done other lovely little things that she'd love to tell you about but that she's sure you'd find more interesting to hear of in person. Her opinions are her own and do not reflect those of EPL, SLJ, or any of the other acronyms you might be able to name. Follow her on Twitter: @fuseeight. 006ab0faaa