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[TI] TPS54231与54331低压差输出的尝试,请指点

Other Parts Discussed in Thread: TPS54231

网友 worldheaven   在21ic 电源论坛问题未决:

http://bbs.21ic.com/icview-553046-1-1.html

一直无法在输入5V的时候输出3.9V,6V输入才可以
难道是TI这个系列的开关IC,都需要2V压降才行么?