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LM5035是平均电流控制问题,cs脚的设置

Other Parts Discussed in Thread: LM5035, UC3846

LM5035是平均电流控制,以前只用过UC3846峰值电流控制,请问在CS脚设置有什么讲究吗?
我现在调试的现象是:LM5035的CS脚开路,加载到24V2A时,有自激现象。接上检测电流,但还没有到Vcs电压(0.25v),仅加载24V0.4A就有自激现象。外围的补偿电路也调试过了,不知道那位大侠有高见!

原理图是按TI规格书的