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Fellows,
We have several successful implementations of power supplies within our projects, mostly based on Webench. This particular one, however, has been causing me to pull some hair off...
If we enable VIN, current peaks up as high as we allow it to (as if there is something shortened on the circuit below it), and the power supply won't start.
We've looked for the most common causes and for shorts as well, finding none. There are three similar boards, same status. We thought maybe this IC needed some initial load to crank up, added a load to draw ~100mA from it before starting, but no good.
I'd appreciate if someone can take a look at the circuit for maybe an obvious mistake, or guide on how to further diagnose this.
Thanks a lot, regards.
Bruno
Hi Bruno,
Your schematic looks Ok, nothing obviously wrong.
From the problem description you provided above it appears that there is either a short circuit or large inrush current causing power supply to rail.
To handle potential issues with inrush current
Best regards
Brani