自己搭了一个BUCK降压电路。TL2843控制BUCK电路MOS的开通/关断。但是这个电路出不了小的占空比,求解答?3Q!!!
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Hi
如上回复,即便comp电压有3.1V,到达电流比较器上的电压也很低,一样会过流保护,一旦保护就关掉驱动,占空比就会受限。
你需要调整电路与程序,是的comp电压上去,并且FB电压是稳定的,FB电压与其基准电压误差放大到comp输出。