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There are many Gnd pins in WiFi chip and they are all connected so i datashset no option of disconnecting all the ground pins to make a low side switch. Why is my WiFi chip not powering up? 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. You may have misunderstood the parameter Vgsth To turn on Vs – Vg needs to be comfortably greater in magnitude than Vgsth.
The connection is as follows Source 3. A normal transistor in saturation may even be enough to switch a small WiFi module.
IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search
For low saturation voltage both Darlington pair and Sziklai pair are bad because they “steal their own drive” as they turn. A normal transistor would do and i experimented too.
Are you doing that? Although they usually seem to fail on rather than off. I am able to get it in bangalore and mumbai but they are taking datashert time for shipping say weeks. My WiFi chip works fine with 2. I may need around mA for my WiFi. Sign up using Facebook.
IRF9540N MOSFET. Datasheet pdf. Equivalent
What is your load current? The only problems are: A wide range of datashdet bipolar PNPs will work. The problem is the WiFi module is designed such that i have given provision to switch the 3. Yes i am connecting the gate to the ground so that i get I would recommend against switching the ground side on complex components like a WiFi module. Instead of switching 3. Post as a guest Name. All the circuit samples in the data sheet use 10V as the gate voltage.
A FET becomes attractive: Do you have easy access to a range of parts? However, the graphs are for typical values.
On page 2 of the data sheet it says Vgsth is -2V min and -4V max. Saturation voltage of a bipolar transistor can be less or much less than the Vbe drop.
IRFN 데이터시트(PDF) – International Rectifier
BCxx7 data sheet here See Fig 9. Normal transistors BC is switching only mA. They are much more common, cheaper and usually have a lower on resistance than p-channel for the price. Rif9540n help would be appreciated. Your circuit seems correct in principle. The falling poutput voltage “steals” drive from the input so Vc2 out can never be less than 1 x Vbe or more.
To do that with eg 0.
You mention mA WiFi current. R3 is ‘or safety’ to ensure Q2 turns off. Vijay Anand Chandrasekaran 45 1 Email Required, but never shown. I have no idea what could be the issue? 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. Lower beta transistors can be used with smaller values of R4. I tried using darlington pair but the voltage drop is around 1.
My load current may vary from 0 to mA.
Sign up using Email and Password. Also make sure you are using a static wrist strap and anti static bags. Lower values of R4 may be needed to get low enoughy saturation voltage. Mosfets are incredibly sensitive to static and I have destroyed many like this. Thank you for the link. Resistor values irf540n liable to be about right – play as required.
R2 not required if input is always driven high or low and never floats. It’s best to give components like datassheet a solid connection to the ground plane without any pinch points.