用UCC2897A做的一款 DC-DC,输入36-75V,输出12V@25A,空载状态有啸叫的声音,加载后明显减少,但是隐约能听到,一直是嗞嗞响,输出电感量5uH,整流管是V40100,输出电容是AVX 47UF/25V多个并联,外加TDK陶瓷电容10u/25V.反馈环路采用431+P181光耦,主开关波形和钳位波形均正常,求解?多谢!!
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