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有关TL494的问题 求教!

Other Parts Discussed in Thread: TL494, TPS40210, LM3478, LM5122

用TL494做一个升压电路,用BOOST拓扑。12脚电源为12V。用1,2脚做电压环,2脚给的基准电压2.5V,想升压到30V,空载时测得输出高达76V,且1脚电压总是被拉低到几乎0V,实际测0.03V,续流二极管温度很高。还有15脚电压达到了7V,空载16脚没有电流,测得电压也是0.03V。 因为之前在实验室做过一次,成功了。同样的电路做另一个板子时出现这样的问题,不知道什么原因,我错在哪里了,希望专家回复!