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高压模块电源UCC38C42

Other Parts Discussed in Thread: UCC38C42

本人正在设计一款高压模块电源:input:90V-1100V, output:12V/0.5A,用了好几种方案,其中也用到了UCC38C42,可是效率一直上不去,MOS发热很大,可是MOS管的Rds=2.2R,驱动波形也很漂亮,可就不知道原因在哪里,请高手指点一二。。。。。。。。