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TPS62821: Startup ripple

Part Number: TPS62821


Do you know what would causes the following startup ripple on the TPS62821? This happens under both full + no load.

I assume this is something to do with the controlled soft-start - is this normal and expected? The noise is only present up to around 0.5V so I don't believe it's an issue but I'd be interested to understand what causes it. 

Many thanks