Hello John,
Looking forward to it :-)
Actually that's the directory, the file is called ts951.pdf:
No idea why they named the directory 5561. The SE5561 used to be an old switch mode controller chip. Maybe someone wanted to keep a memorial for it. Or could be the trailer for the old internal four+four number scheme that many companies use in the doc center.
But look on the bright side: They don't list the package size as being between zero and half an acre.