skmdmasud
Member
Hi..
i am trying to learn basic about reading datasheet of transistors namely FETs. What i dont understand is for lets say IRF540
1. Vgs is rated max 20V but in the Gate Threshold V it says Min 2V and Max 4V but in graph below
the drain to source current starts from 4.5Vgs, so whats the threshold all about? Should i apply 20V to make it behave like a closed switch or 4V??
2. In some MOSFET the Rds(on) is 23mΩ and in some it is 0.05 or 0.005Ω. Shouldn't the Rds be very small because its the resistance between the drain to source when operating like a closed switch.
Thanks and Regards
i am trying to learn basic about reading datasheet of transistors namely FETs. What i dont understand is for lets say IRF540
1. Vgs is rated max 20V but in the Gate Threshold V it says Min 2V and Max 4V but in graph below
the drain to source current starts from 4.5Vgs, so whats the threshold all about? Should i apply 20V to make it behave like a closed switch or 4V??
2. In some MOSFET the Rds(on) is 23mΩ and in some it is 0.05 or 0.005Ω. Shouldn't the Rds be very small because its the resistance between the drain to source when operating like a closed switch.
Thanks and Regards