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功率NMOS的驱动电荷量

Other Parts Discussed in Thread: CSD13385F5, CSD87313DMS

查看了很多款功率NMOS,比如CSD87313DMS、CSD13385F5等型号,参数列表中只给出了VGS=4.5V、VDS=6V、IDS=0.9A等固定值情况下的栅极电荷量,当我的MOS工作状态不在这个情况下,我不知道我的驱动电路瞬间电流能不能驱动NMOS打开,这时的栅极电荷量该怎么计算呢?有计算公式或者工具吗?