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hi all. please give me a hand. the questions about viper22a.

Question asked by shan.dong on Jun 29, 2010
Latest reply on Jun 29, 2010 by ST Employee Fabrizio
 i have designed a AC-DC converter by using viper22a. the topology is fly-back. as the viper22a's datasheet say, the Vds(st) should be less than 400V. so i want to know if the viper22a may be damaged when the input AC voltage is 300V ? at that time,Vds(st) would be 424V (300*sqrt(2)). it has excessed the maximum Vds(st). what on earth does the Vds(st) mean?
      at last ,i am sorry for my poor english. please sb give me a definitive answers. thanks.