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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th October 2012, 02:42 PM   #2661
Dxvideo is offline Dxvideo  Turkey
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Quote:
Originally Posted by Dxvideo View Post
One question..

Is it safe to use 200v Vds (like IRFP250) MOSFETs with +/-100v supplies in this circuit (the first 1250W into 4R one)..
Ok..
Nobody will answer I guess..
Anyway, so whats the safe supply margin for Vds=200v MOSFETs? For example is +/-90v ok?
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Old 18th October 2012, 02:45 PM   #2662
CPX is offline CPX  Romania
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The answer si NO...it is not safe...i would use a maximum of +-80 . For +-110 volt use 250 volt mosfets.
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Old 18th October 2012, 02:52 PM   #2663
Dxvideo is offline Dxvideo  Turkey
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Thanks CPX.. This info will be very usefull for me..
Just one last question...
Whats the Ids margin for MOSFETs in this application?
Means;
Can I use 34A Ids (DC) MOSFET for 1000W/2R application (32A peak at load)?
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Old 18th October 2012, 02:53 PM   #2664
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Hi CPX
greetings for 2 ohms load safe operating voltage for 200 volt mosfets is--
warm regards
andrew
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Old 18th October 2012, 05:27 PM   #2665
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Hello everyone

i have made irs 900d and scaleable philips ucd amp which its schematic was written in spanish. irs 900 was good but the other one is not stable at 60 volts per rail and ir21100 warms up to 70 degrees.

I wonder if anyone of you could give me another circuits using irfp250 and ir2110 to achieve 400 watts @ 4 ohms that being tested .
I count on your recommendation so i'll wait for your recommended circuits.
regards.
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Old 19th October 2012, 12:09 AM   #2666
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Hi nn20
greetings try irs 3000 its tested detex audio has redesigned pcb has ocp which really works well option to add another pair of fets for more power pcb is compact and
its tested TRY IT
warm regards
andrew lebon
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Old 19th October 2012, 05:40 AM   #2667
stewin is offline stewin  Kenya
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Quote:
Originally Posted by pergo View Post
that's IGBT is too slow max 40kHz in hard switching
hi pergo if the igbt is slow like 40khz then what power is it producing in the below yamaha power amp smps
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Old 19th October 2012, 08:05 AM   #2668
pergo is offline pergo  Italy
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Quote:
Originally Posted by stewin View Post
hi pergo if the igbt is slow like 40khz then what power is it producing in the below yamaha power amp smps
in that circuit, the SG3525 seems timed by 470p/50k (low image resolution doesn't help).
So switching frequency seems 60kHz.

Datasheet says that, for hard switching like half-bridge smps, 40kHz is the recommended frequency.

If you use those IGBT in a smps at those "low" frequency, they are fine.
If you use is for class D output stage, they are unsuitable
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Old 19th October 2012, 08:58 AM   #2669
exflaco is offline exflaco  Armenia
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Mano the schem aud600?
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Old 19th October 2012, 03:30 PM   #2670
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Quote:
Originally Posted by andrewlebon View Post
Hi nn20
greetings try irs 3000 its tested detex audio has redesigned pcb has ocp which really works well option to add another pair of fets for more power pcb is compact and
its tested TRY IT
warm regards
andrew lebon
Hi Mr Lebon . thanks for your recommendation.
could you post the PCB for me to be sure that it's the correct one.
is it possible to run it @ 60 volts per voltage rail?
what changes are neeeded ? (e.g RSS resistor value & ...)
thanks alot ...
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