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BQ24172芯片无法充电

  •  根据器件手册画的原理图如上,设置的是5V~14V输入,8.4V输出。现在用直流电源10V输入,输出端空载时,H2灯闪烁,SRP,SRN,SW和VOUT电压只有0.7V,FB电压0.18V,OVPSET电压1.1V,TS电压1.85V,VREF电压3.3V,BTST和REGN电压6V,SW测不到任何波形,不知道哪里的问题,请求指教