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TPS53319无输出

Other Parts Discussed in Thread: TPS53319

你好:我现在在使用TPS53319芯片出现没有输出的问题,电路图如下图,输入19V,输出3V3。输出电容是100uf。测量了MODE上有500mV的震荡波形。LL上没有输出 VREG输出5V正常,VBST上是5V上叠加了一个锯齿波震荡。使能信号给的是2.5V在手册要求范围内,还是没有输出 请问是哪里的问题