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输出电流就会出现不稳定的现象

Other Parts Discussed in Thread: TL494

新开发升压电路,输出12v,IC用TL494恒流控制,输出电压由负载LED决定,发现一个问题,当输出电压超过40V时,输出功率增大,输出电流就会出现不稳定的现象

电路图如下

95.pdf