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TPS55288-Q1: TPS55288-Q1通电默认输出配置下,输出电压过小,几十mV

Part Number: TPS55288-Q1
Other Parts Discussed in Thread: TPS55288, TPS55288EVM-045

应用TPS55288做BUCK-BOOST电源,输入15V~18V,输出电压都采用默认配置,默认内部反馈调节,以及默认的输出电压反馈系数,此时应该是输出5V,但是测得在输出仅有几十mV,不知道什么原因,下面是我的原理图