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LM51551 FLYBACK设计,辅助绕组圈数确定?

Other Parts Discussed in Thread: LM51551

你好,请教如下的电路,LM51551 FLYBACK设计,我设计是9~36V输入;正常是24V输入,250KHZ; 

现在下图这个变压器,1/3是6圈;5/4是5圈;现在我在24V输入时,我断开VCC测试,C42上电压40V; 

当我把输入电压调高,C42电压会下降;输入电压调低,C42电压升高 ;

但是LM51551手册上,VCC最大只能16V; 所以之前调试时,损坏掉了不少LM51551; 我现在都是断开VCC的;这样LM51551长时间工作会较烫; 

所以,请教,现在5/4这个辅助绕组应该定多少圈?谢谢