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TPS25740 20V输出遇到问题

Other Parts Discussed in Thread: TPS25740, TPS65982

我们在使用TPS25740设计一款TYPE-C电源转接头,PDO配置为5V@3A和20V@3A;在与TYPE-C SINK设备连接测试时,5V能够正常完成PD握手协议并正常输出,20V则无法正常输出,请TI工程师帮忙看下问题出在哪里,急等,谢谢!

参与测试的TYPE-C SINK设备方案为TPS65982

附件是产品设计的原理图,以及20V的PD握手协议

另:芯片的VTX引脚我们量测电压始终是0V,和datasheet描述不太相符,不知是否正常

TYPE-C POWER.rar