IRFP240 versus carrier power

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IRFP240 versus carrier power

Postby cableman » Fri Sep 29, 2006 5:01 pm

Hello,
I saw in the designs of Steve's PWM modulator 5 x IRFP240.
I thought it was for appx 350 Watt carrier.
But i saw in the photo's of Steve's modulator 2 Fets for 320Watt.
Just made a new PWM PCB design with 5 fets,but this is too much isn't it?
What would be the amount for 350Watt carrier?
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Postby kf1z » Fri Sep 29, 2006 6:34 pm

On Steve's website, on the PWM Page http://www.classeradio.com/newpwm.htm

It says:

"The PWM output PC board can be configured with as few as one (1), to as many as five (5) power MOSFETs / Damper diodes. The number of devices installed depends on how much power the system is required to deliver. Each modulator MOSFET will handle about 250 watts of carrier power (DC input). So, if the modulator is to deliver 400 watts carrier, two MOSFETs and two damper diodes should be used. "


Does that help?

Bruce G
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Postby cableman » Sat Sep 30, 2006 10:39 am

Thanks a lot Bruce.
Now i can reduce the PCB from 5 to 2 fets.
This give me really some space on the board :D

Greetings Bert
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Postby kf1z » Sat Sep 30, 2006 5:38 pm

OK Bert,

I just noticed that you stated IRFP240....

Steve uses IRFP260N....

Possibly just a typo on your post.


Just checking........


Take Care.
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