|
现在由于MOS管的制成,RDs小的 往往G极寄生电容比较大,此二者有一定的反比关系~~~~所以在选择MOS管时候需要搞清楚实际的运用环境~~~~
* b4 u3 u) u( U, E- v$ |比如BUCK电路,上管电流比较小,选择RDs大点,寄生电容小的就可以,而下管,比如输出有10A,那么建议选择RDs小,寄生电容大一点也不所谓。& x$ v' |$ f6 Z- y
, Q' [7 ^" V/ W4 y2 s: X$ ]- Q' L
2 w$ I. U; o( C% x* _) P另外提醒一点,如果上管选择RDS很小,寄生电容很大的MOS管,有可能会导致你的电源无法正常工作,无输出~~~~我已经有两个同事因为不认真选择MOS管,出现这种情况了~~~
, Z7 f& {, l+ B* w% C9 w |
|
If by life,you were deceived.
Don't be dismal ,don't be wild!
In the day of grief,be mild!
Merry days will come, believe.
Hearts is living in tomorrow.
Present is dejected here:
In a moment, passed sorrow
that which passes will be dear.
|