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UC2844在不带载的情况下，输出电压正常，带上负载后发现输出电压有波动，输出的电压越高波动越明显测试了波形后发现，3\4脚波形正常，1脚反馈回路出现怪现象，大周期是在上下调整，小周期出现锯齿波，频率有几十K
