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UC2843开关电源 负载能力差

Other Parts Discussed in Thread: UC2843

UC2843设计的隔离开关电源,80~265VAC输入,三路隔离输出分别是15V-5W,5V-5W,5V-2W,当15V带载2W时,输出电压从16V跌至15.5V,有没有什么办法改善?