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UC3825A: UC3825A的低占空比输出电流震荡问题

Part Number: UC3825A

BUCK输入电压250V,环路工作在CC恒流模式,当输出电压低于5V时,当输出电流小于5A时,输出电流有较大震荡,震荡频率大概在2KHz-10KHz,输出电流逐渐增大时,输出电流震荡幅值逐渐减小;输出5V/5A时,驱动占空比很小,EAOUT信号在1.25V左右,震荡使得EAOUT有低于1.25V的情况,这时驱动波形“丢失”,没有发波,这又使得输出电流在震荡;当负载由纯电阻改为LED灯时,输出电流震荡更严重;有没有好的控制方法能消除小电压小电流输出时的震荡?