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TPS53319无输出的问题

Other Parts Discussed in Thread: LM3880

采用WEBENCH的设计,将EN引脚的输入做出了修改,改为了在VIN引脚上电后经过4ms延迟后上电,这是通过LM3880上电顺序启动芯片输出的,其电路图如下:

检测不到输出电压,将R23引脚拆除后有输出电压1.6V,带负载则降为0.6V参考电压。