| Electronics > Beginners |
| Understanding P Mosfet drive |
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| ZeroResistance:
I need to switch a grounded load using a high side P Channel mosfet similar the image attached. The supply to mosfet source would be around 50Vdc to a maximum of 100Vdc The mosfet is the traditional IRF9540. My first thought that mosfet driver like the the TC4429 would be suitable for this however it soon dawned on me that 1. the TC4429 max supply voltage is 18VDC. 2. The Mosfet Vgs max is +/-20V. So even if I ground the gate to turn it on the Vgs rating is likely to be exceeded. A zener might probably mitigate that but it would affect the turn on time. The turn on times I require are under 10uS. What would be the correct way to switch on the P channel mosfet? |
| SteveyG:
What's your Vdd voltage? |
| andybarrett1:
I asked similar question few days back.... Lots of useful pointers here :- https://www.eevblog.com/forum/beginners/mosfet-175797/msg2283114/#msg2283114 Thank you all Andy |
| ZeroResistance:
--- Quote from: SteveyG on March 25, 2019, 12:02:10 pm ---What's your Vdd voltage? --- End quote --- 50 to 100V as given. |
| SteveyG:
Is your micro going to sit referenced to the 50 to 100V or were you planning a common ground? |
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