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关于LM3445接上调光器,led驱动电源变压器会有轻微的叫声!

Other Parts Discussed in Thread: LM3445

大家好,我们客户给我们两款用LM3445做的可控硅调光LED电源,我们在接上调光器调光的过程中,出现驱动电源变压器会有轻微的叫声!不接上调光器,直接接负载,变压器没有叫声!工作频率设定F=75kHZ(32V0.5A)/125kHZ(12V/0.5),

Protel Schematic.tif