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当输入电压和输出电压相近时,芯片工作在Buck- Boost模式。在Buck- Boost 模式是一种过度和自适应模式。
假设工作在Buck模式时,当Vin下降接近Vout,达到Buck模式最大占空比时,电路会自动将开关管工作状态切换到Buck- Boost 模式。
假设工作在Boost模式时,Vin增大接近Vout,达到Boost最小占空比时,电路会自动将开关管工作状态切换到Buck- Boost 模式。