Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] Help in choosing the right MOSFET

Status
Not open for further replies.
R

Roman.123

Newbie level 3
Newbie level 3
Joined
Apr 19, 2012
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,298
Hello,

I need help in choosing the right MOSFET for my circuit.
I want to connect a power resistor 50W 4ohm to 12V (from cpu power supply) with a MOSFET.
The Gate pin of the MOSFET will connect to a pwm pin of ATmega328 (pwm 490hz and 5V logic '1').

In conclusion i need to know what MOSFET (and maybe another parts) i should connect from the pwm pin to the resistor and the 12V form power supply.

Thank you for any help.
 

I would use an IRF540 MOSFET to switch the current from a 12 V source to your 4 Ohm resistor. Only please connect the N-channel between ground line and resistor; the other end of the resistor will be connected to +12V.
IRF 540 can be driven by a TTL signal to gate; you can find more MOSFET types among "TTL-controlled MOSFETs". Be sure you use a good heat sink, 4 Ohms at 12 V will dissipate 36W, cool the IRF, too.
 
jiripolivka said:
I would use an IRF540 MOSFET to switch the current from a 12 V source to your 4 Ohm resistor. Only please connect the N-channel between ground line and resistor; the other end of the resistor will be connected to +12V.
IRF 540 can be driven by a TTL signal to gate; you can find more MOSFET types among "TTL-controlled MOSFETs". Be sure you use a good heat sink, 4 Ohms at 12 V will dissipate 36W, cool the IRF, too.
Click to expand...

Thanks for your help.

Can i use 2N2222 as a driver ? is it fast enough to handle the PWM frequency ?

And the resistor will operate as a heating element in an incubator.
 

Roman.123 said:
Thanks for your help.

Can i use 2N2222 as a driver ? is it fast enough to handle the PWM frequency ?

And the resistor will operate as a heating element in an incubator.
Click to expand...

Yes, a 2N2222 can be used at over 200 MHz. I drive a IRF540 directly from a 7400 logic output without problems.
 
Ok, thanks alot for the help !!!!!!!
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top