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bq24725a 没有输出电压



使用BQ24725A电池管理芯片时,没有输出电压。
测试条件: 输入:19V (万用表)
vcc: 18.8V (万用表)
REGN: 6.08
ACDET: 2.5V
ACOK: 0V
ACDRV: 0V
CMSRC: 0V
根据datasheet: VCC >UVLO VCC >VSRN 275mv ACDET: >2.4
为什么ACOK没有变高?mos管栅极电压为0?]