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UCC33420: 电源带载能力

Part Number: UCC33420

UCC33420 EVM测试中,原边4.5V供电,5V输出条件下,副边带载只能到100mA,150mA时,输出只有4.5V;200mA,副边无输出;但看规格书,是支持4.5V供电,300mA带载的。想了解一下是什么原因导致的?