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You may have misunderstood the parameter Vgsth To turn on Vs – Vg needs to be comfortably greater in magnitude than Vgsth. Your available Vgs max is The IRFN – data sheet here needs about While figs 1 and 2 suggest the 3.
On page 2 of the data sheet it says Vgsth is -2V min and -4V max. This would not be good. If you pick through a bin of these you MAY find some that work somewhat better than others and some that MAY work well enough for you – but maybe not, and this cannot be guaranteed. Best likelihood, based on all evidence and the data sheet, is that even though your load current needed is tiny – the Vgsth value is so far above your drive voltage that it just sits and grins at you. For low saturation voltage both Darlington pair and Sziklai pair are bad because they “steal their own drive” as they turn.
R4 then not needed but does no harm. Q2 can be a single adequately rated PNP or several smaller ones in parallel. A wide range of small bipolar PNPs will work. BCxx7 data sheet here See Fig 9. BCxx has a typical saturation voltage of about 0. The part has a beta of typical range. Lower beta transistors can be used with smaller values of R4. Resistor values are liable to be about right – play as required.
IRF9540N MOSFET. Datasheet pdf. Equivalent
R2 not required if input is always driven high or low and never floats. R3 is ‘or safety’ to ensure Q2 turns off. Lower values of R4 may be needed to get low enoughy saturation voltage. A FET becomes attractive: If you look at graph in the datasheet of current vs gate-source voltage Fig 3 and extrapolate down to 3V you will see that almost no current will flow.
All the circuit samples in the data sheet use 10V as the gate voltage.
Home Questions Tags Users Unanswered. Vijay Anand Chandrasekaran 45 1 datashert Are you doing that? Yes i am connecting the gate to the ground so that i get You mention mA WiFi current. Is that the maximum and is that certain? To do that with eg 0. A VERY undemanding spec.
Do you have easy access to a range of parts? For instance if in eg Mumbai or Bangalore there are many suppliers.
Do you want some specific parts recommended or is the above good enough? I am working in Delhi.
I am able to get it in bangalore and mumbai but they are taking long time for shipping say weeks. Can you dagasheet suggest me some MOSFETs specific parts which are locally available or which people often use for their research? Thank you for understanding my problem. However, the graphs are for typical values. Russell McMahon k 9 But the voltage drop is around 0. Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop. Vbe can be say 0.
What is your load current?
IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search
This affects what is best to use. If you draw a Darlington cct you will see it is different. The falling poutput voltage “steals” drive from the input so Vc2 daatsheet can never be less than 1 x Vbe or more. So a Darlington may not do what you want but a single bipolar may. You are right, using darlington i got 1. My load current may vary from 0 to mA.
Your circuit seems correct in principle. The only problems are: A normal transistor would do and i experimented too. Normal transistors BC is switching only mA. I may need around mA for my WiFi.
I tried using darlington pair but the voltage drop is around 1. They are much more common, cheaper and usually have a lower on resistance than p-channel for the price. Here is one that seems will work with 3V sparkfun. I would recommend against switching the ground side on complex components like a WiFi module.
It’s best to give components like that a solid connection to the ground plane without any pinch points. Thank you for the link. The problem is the WiFi module is designed such that i have given provision to switch the 3. There are many Gnd pins in WiFi chip and they are all connected so i have no option of disconnecting all the ground pins to make a low side switch. I have to go with high side switch only.
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