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UCC28610输出电压不对

Other Parts Discussed in Thread: UCC28610, LMV431, TL431

我用UCC28610芯片,输入电压为DC220V-DC380V,要求输出电压是13V,输出功率是10W。我计算出来的变压器原副边匝数分别为110和16,原副边电感量分别为1.347mH和27.490uH,但是现在就只能出6V的电压,是不是变压器计算的不对,我应该从哪些方面着手解决呢?