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tps40170做的18V电源输出只有15v,PWM不停的重新启动



24V输入,输出18V15A给电池充电,现在上电空载只有15V输出电压。SW引脚的PWM只有7个脉冲就重新启动。SS引脚0到2.2V重复循环,FB引脚电压0.5V左右,VULO1.2V,EN引脚8V电压,3.3.V和8VLDO输出正常。不知道是那个参数配置不对

18V15A.pdf