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tps65251输出异常问题

Other Parts Discussed in Thread: TPS65251

我用它tps65251输出1.2,1.8,3.3V三种电压,输入5~+12V电压。各电源负载都不超过1A。原理图如下图所示。

但现在三路电压输出都不正常,电感前段输出波形不是PWM方波,如下图所示:

波形展开后如下:

电感都断输出波形不是直流,而是类似锯齿波:

请问这是什么情况?三块板子都有一样的问题。