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TPS54140输出电压稳不住!!!急!!!



工程师:

        你好,如图,54140原理图,正常输入电压13V到16V之间,输出12.8V左右,但是批量生产后,输出电压稳不住,导致生产停顿;

       目前测试情况,由于是变压器无反馈的绕组输出进行的稳压电路,当无法稳压时,电源的输入电压抬高到18V,输出只有8V,频率测试只有几百HZ,驱动波形异常,且有自激的现象;2/3楼提供照片和关键波形。麻烦帮忙分析是啥情况???