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Old 30th August 2011, 01:15 PM   #1121
luka is offline luka  Slovenia
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I have now connected smps with IRS amp, and this thing has some serious POWER, just saying...
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Old 30th August 2011, 07:15 PM   #1122
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Grinding cores, you also need to polish them to make sure you don't have any jagged surfaces.Why would you want to grind a core set.The transformer from almost any 500watt or above PC power supply can be used for 400watts and above,also if you have two of these the transformer core can be used as the inductor for your 500watt pfc.
They are small psu from china,labeled '400 watts' and '550 watts'.......honestly i dont think they are anywhere close to 200W. Their main formers are much smaller compared to a genuine 215W psu from my cpu.
I just want to grind the outer legs then smoothen them with a sandpaper to see how it'll turn out. Am a little busy(in college) and i dont know how much time i can have for this project. Am not in a hurry to build it,i want the knowledge and experience first. Maybe i'll use the small cores first.
I just bought a KA3525A, i haven't read the datasheet yet; is it an sg3525 equivalent?
Regards,Xeclipse
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Old 30th August 2011, 08:23 PM   #1123
chas1 is offline chas1  Dominican Republic
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Don't grind the legs,the only part of a core set that should be is the center leg,you can add gaps in the outer legs with a business card(1mm).Don't let the size of the core fool you,it's the frequency that you use it that determines the power up to a point,taking in the saturation properties.The size of the center leg will give you some idea,small less power while large more power...Beware of gapping cores unless necessary.
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Old 30th August 2011, 10:07 PM   #1124
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Don't grind the legs,..........Beware of gapping cores unless necessary.
Am not trying to gap the core.......am trying to eliminate the gap in the center leg by grinding the outer legs.
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Old 31st August 2011, 05:45 AM   #1125
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I have now connected smps with IRS amp, and this thing has some serious POWER, just saying...
What are the IRS amp ratings?
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Old 31st August 2011, 05:59 AM   #1126
luka is offline luka  Slovenia
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What are the IRS amp ratings?
now with +/-66v it is over 400w into 4r load, far more then my speaker can handle and/or I need... still thinking if I would connected it to +/-75
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Old 31st August 2011, 08:14 AM   #1127
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now with +/-66v it is over 400w into 4r load, far more then my speaker can handle and/or I need... still thinking if I would connected it to +/-75
Just remember to take some photos when the magic smoke come out of that speaker!
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Old 31st August 2011, 08:50 AM   #1128
luka is offline luka  Slovenia
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hehe, I won't push it that much, this pair will have to go into car along with other two pairs, I can't smoke them with this
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Old 1st September 2011, 02:51 AM   #1129
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it can't be done (drive gate above max voltage), unless there are P channel fets
Hey Guys,

The only way a high-side N-Channel MOSFET can be driven w/o a floating-gate driver IC (IR2113 or equivalent) or gate-drive xfmr is by using a discrete boot-strap circuit. I forgot the circuit layout, but if I come across it, I will post it here.

Cheers,

Steve
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Old 1st September 2011, 11:46 AM   #1130
chas1 is offline chas1  Dominican Republic
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Refer to classd amplifiers in this forum,used in quite a few designs.My question is why bother,a gate drive transformer can be realized with a few turns on a ferrite core and ic's are cheap,fewer parts less costs,improve mtf.There are quite a few app notes on this subject.A gate drive transformer is cheaper and consumes less pcb area.
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