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TPS75533输入端为LM2576的BUCK电路，输出5V非常稳定，后带一个TPS75533，输出3.3V，但是输出电压不是3.3V，是5V，不知何故，测量对地阻抗与其他正常电路板相差很小。
上你的电路图，不可能出现这个情况的。
建议到电源管理板块提问http://www.deyisupport.com/question_answer/analog/power_management/f/24.aspx
