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LM5176怎么判断自己应工作于升压模式还是降压模式?

Other Parts Discussed in Thread: LM5176

在立创商城买了LM5176,做板回来,功率部分不加输入电压,只给LM5176供电,四个MOS管均已焊接。如果输入电压供电12V,输出加上9V,本应工作于降压模式,但实测四个MOS均有PWM波形,控制逻辑怎么不对呢?