Electronics > Projects, Designs, and Technical Stuff

Control JFET using MCU

<< < (3/4) > >>

Kleinstein:
The BSS139 or NSVJ3910SB3 look both OK. There is no explicit spec for R_on, but a curve for I vs V_DS that suggests some 10-20 Ohms as a typical value.

It would still need a negative control or supply, e.g. through the charge pump circuit shown by Zero999.

gaminn:
OK, I think I will implement BSS139 and the charge pump circuit mentioned above.

Zero999:
The NSVJ3910SB3 has an on resistance of 30R or better, when ID <10mA, but the BSS139 is cheaper and has a lower on resistance, so go with that.


--- Quote from: janoc on August 20, 2019, 10:17:25 am ---
--- Quote from: gaminn on August 20, 2019, 08:53:05 am ---When there is no power I want the switch to be ON. That is why I want to use JFET.

--- End quote ---
That sounds like you want a depletion-mode MOSFET and not JFET

--- End quote ---
It just needs to be a depletion mode device, be it a MOSFET or JFET.

janoc:

--- Quote from: Zero999 on August 20, 2019, 12:56:26 pm ---It just needs to be a depletion mode device, be it a MOSFET or JFET.

--- End quote ---

Given that it is for a switching application, the MOSFET is likely a more logical choice.

Zero999:

--- Quote from: janoc on August 20, 2019, 06:44:09 pm ---
--- Quote from: Zero999 on August 20, 2019, 12:56:26 pm ---It just needs to be a depletion mode device, be it a MOSFET or JFET.

--- End quote ---

Given that it is for a switching application, the MOSFET is likely a more logical choice.

--- End quote ---
Why?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod