Is it really possible to have 500W output....

[RealForce]

Is it really possible to have 500W output with only IRS2092 and two output FETs?

How these two out FETs can handle that power in class D but can't in Class A. Is it because of PWM in class D?

Thanks.

[Saturnus]

Simple. In class A there would have to be at least 10 times the output lost in the FETs whereas in class D only 10% of the output is lost in the FETs.

[RealForce]

Originally Posted by Saturnus

Simple. In class A there would have to be at least 10 times the output lost in the FETs whereas in class D only 10% of the output is lost in the FETs.

So in one word it is possible to have 500W with two strong lets say IRFB4227?

And what about the temperature dissipation?

[sildex]

I'm also a fun of this chip. But it has a major disadvantage that only works from what I remember with max 200V. If it would be possible to stand up for more I think It could be possible to make an amp connected directly to 220V rail
Anyway I think this is still possible if you have 110V power network...with some filtering...this could be done.

[Printer2]

Originally Posted by RealForce

So in one word it is possible to have 500W with two strong lets say IRFB4227?

And what about the temperature dissipation?

In class D the output device passes the current to your speaker like a switch. It is on or off. When it is off there is no practical power loss. When it is fully on there is just the minimal resistance across the device that dissipates power.

Most of the power dissipated by a device occurs when it is transitioning from off to on to off. It transitions from a very high resistance to a very low resistance and back to a very high resistance.

During this transition the device no longer acts like a switch but as a varying resistor. When you put current through a resistor it heats up. The good thing is that the time it acts as a resistor is very short. Because of it the device stays cool.

Now if this all sounds new to you this chip is not something you want to play with. While it seems quite simple from the outside a lot of things have to be done right so you do not run into trouble.

[savu]

Originally Posted by sildex

I'm also a fun of this chip. But it has a major disadvantage that only works from what I remember with max 200V. If it would be possible to stand up for more I think It could be possible to make an amp connected directly to 220V rail
Anyway I think this is still possible if you have 110V power network...with some filtering...this could be done.

... and a small shock and somebody dies.
online amps have to be electricaly insolated with everythyng around them.
you have to have optic fiber input , all the controlls have to be insolated and briven optuicaly and bround plane is a must.

very rishy bussiness. better use a SMPS is not that expensive

regards,

[RealForce]

Originally Posted by savu

... And a small shock and somebody dies.
Online amps have to be electricaly insolated with everythyng around them.
You have to have optic fiber input , all the controlls have to be insolated and briven optuicaly and bround plane is a must.

Very rishy bussiness. Better use a smps is not that expensive

regards,

i totally agree with this one.

[savu]

Originally Posted by RealForce

Is it really possible to have 500W output with only IRS2092 and two output FETs?

How these two out FETs can handle that power in class D but can't in Class A. Is it because of PWM in class D?

Thanks.

Class D works with high energy pulses that are integrated via a LPF (low pass filter). the eficiency in class D can be over 95%.

using irs2092 and irfb4227 with totem drivers in full bridge can ensure you a 3KW output into 4 ohm.

you could also try irs2092 and irfi4020h for about 500W output

regards,