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DRV8952: VCP 欠压保护

Part Number: DRV8952

按照如下电路设计驱动TEC,焊接后有的板子没有电压输出(PWM频率200KHZ,占空比30%,+15V_TEC实际电压为13.2V),测试发现VCP电压低于VM电压。测试NFAULT有发现有脉冲波形,说明芯片处于电荷泵保护了。如何解决这个问题?