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fredos 10th March 2006 06:53 PM

Any one need IRS20124S ???
Hello guy. Just to let you know I have 54 pieces of IRS20124S mosfet drivers with protection and dead time, not enought power for what I whant. I know that lot of people whant to make experimentation with these chip, so I will not sell more than 6 pieces lot. Every one will be able to test it...



IVX 11th March 2006 08:41 AM

Fredos, thx for your kind offer (actually, IRS20124S already accessible in RU. for $3.90), can i ask you twice, but slightly off topic?..

1) Transient Intermodulation Distorsion =0% due to the nature of the circuit
2) The amplifier output slew rate is internally controlled to optimize phase linearity and improve transient response, there for it cannot have slew rate limit.

..I wondered, what you mean?

PS: i guess, 96% efficiency for amp only?

fredos 12th March 2006 01:40 PM

Intermodulation is 0% for simple reason of the feedback topologie. All feedback in the amplifier are made in analogue ways, with the speed of switching power transfert. No intermodulation distortion was measured ( under clipping, you understand?).

96% is simple to reach if you design amplifier for Kw and use it in fews 100 watts...Think of what happen if you run a 800 Watts amplifier with 200V 100 Amps APT power mosfet....Switching lose is near he same as STW power mosfet, so the major resistive lose are minimised. Same for power supply! Always use duty cycle limiter too to limit maximum power output...That's all for now!

Just over size every thing and you will see!


PS I have think about 15$ for 6!

audiodesign 17th November 2006 06:33 AM

Could you send me 6 chips ?

Paypal ?

A. Ciuffoli

Pafi 17th November 2006 12:55 PM


So actually what is the answer to this question?


i guess, 96% efficiency for amp only?
Yes or no?

fredos 17th November 2006 04:15 PM

Email me for IC, no prob. Maximum effiency was reached at near 75% modulation deep. If you over size your design and let it run at 75% modulation maximum, you can reach 97.5% effiency. Effiency was measured from power draw to output power. Total effiency of amplifier with switching. And effiency was measured in VA, not in watts due to power factor of a switching. That's the real power. That's the only trick to reach as hight effiency, but at cost of higger voltage and current mosfet and precise duty cycle limiter...You should pay for effiency!


sovadk 17th November 2006 07:14 PM

Re: Any one need IRS20124S ???

Originally posted by fredos
Hello guy. Just to let you know I have 54 pieces of IRS20124S mosfet drivers
Do you have it's big brother IRS20954?

I've heard that IRF are releasing 200V directFET MOSFETS. Do you know anything about this?

They've just released IRF6643 which is 150V rated and with a Ron of 35mohm.

alfsch 18th November 2006 12:10 AM

200V max, 51mΩ@ 10V,
Reverse Recovery Time :85 ns, Reverse Transfer Capacitance 46 pf.

sovadk 18th November 2006 12:35 AM

Thanks. I can see that the datasheet is on their site, but you will not find the component if you search for it.
There's a whole list of thir 200V and 150V DirectFET's in this pdf document:

Do you know if IRF supplies samples of these FET's?

Pafi 18th November 2006 08:43 AM


What is "power factor of a switching"? (I know what power factor is, but it is applyed to signals, while switching is not a signal.)

Do your amps have PFC circuit?

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