analysis and tests show that by using slope compensation, the open-loop instability, sub-harmonic oscillation, non-ideal closed-loop response and noise etc . when duly cycle above 50 %, can be reduced or eliminated 理论分析与试验表明,通过引入斜坡补偿可以抑制或消除占空比超过5%时的开环不稳定性、次谐波振荡倾向、不理想的闭环响应、噪声等。