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-   -   IRS2092 2x500W/1000W BTL (http://www.diyaudio.com/forums/class-d/219767-irs2092-2x500w-1000w-btl.html)

b_force 15th September 2012 12:27 PM

IRS2092 2x500W/1000W BTL
 
I'm orienting on some designs for a 2 x 500W (@4ohm) / 1000W BTL (@8 ohm, full bridge) design with around 80-90Vdc power supply voltage.

I really like the "simplicity" of the IRS2092

However, I was wondering if this driver can be used to load around 2 x 500W/1000W by default, or do I need an extra MOSFET driver, like the TC4420 (or a bjt pair)?

sweetperfume 15th September 2012 12:44 PM

Yes to increase the pair of fets you will need an extra driver....this will increase the speed of switching....and you will have to drive it on 75volts to achieve that output if you use two pair of irfb4227 at 4ohms load per channel...means 500watts non clipping

b_force 15th September 2012 02:00 PM

Ok, so I understand that it is not possible to drive 500W with one pair of fets?
You need to parallel them.

Is there a way to determine when an extra pair is needed?
(or could that be find in the application notes of IRF?)

sweetperfume 15th September 2012 02:33 PM

The irs2092 can only draw 1amp current....for more power you will require to increase the fets....without buffer the switching speed decreases causing a load on the driver and resulting in a good smoke out of it.....

b_force 15th September 2012 02:36 PM

Quote:

Originally Posted by sweetperfume (Post 3165946)
The irs2092 can only draw 1amp current....for more power you will require to increase the fets....without buffer the switching speed decreases causing a load on the driver and resulting in a good smoke out of it.....

I understand.

But how much driving current (from the IRS2092) is needed for a given output power?

sweetperfume 15th September 2012 03:02 PM

The fets and the voltage rails decide the output power with reference to the impedance you use on the output...and the output from the chip is just related with how many fets are you using with it.....normally if anyone wants to drive more than one pair they use buffers

nigelwright7557 17th September 2012 08:17 PM

Quote:

Originally Posted by sweetperfume (Post 3165946)
The irs2092 can only draw 1amp current....for more power you will require to increase the fets....without buffer the switching speed decreases causing a load on the driver and resulting in a good smoke out of it.....

The 2092 can supply 1a5.
If you start driving more mosfets the rise time becomes too slow and the 2092 thinks it is having an overcurrent event and resets the 2092.

b_force 17th September 2012 08:28 PM

Ok, but a pair of IRFP250 can be used to drive 500W or 1000W BTL if I'm correct.
So no extra buffer is needed?

luka 18th September 2012 06:36 AM

for the love of god, never ever use those old fets, when you have 10x better ones out there

b_force 18th September 2012 06:39 AM

Quote:

Originally Posted by luka (Post 3169097)
for the love of god, never ever use those old fets, when you have 10x better ones out there

You are right, it was just an example.

Are there other fets that can drive 500W (or a little bit more) as a pair?
Or is it better to use four fets for better cooling (more cooling surface)


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