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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st October 2012, 10:43 AM   #2691
pergo is offline pergo  Italy
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seems this: http://www.tauscher-transformatoren..../pdf/hf_63.pdf
Rated 1.2kVA @100kHz in push pull mode.
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Old 21st October 2012, 10:48 AM   #2692
Pafi is offline Pafi  Hungary
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99 % of the members here will never use the amplifier for a long time at more than 30 % of the rated power. So thermally it can be designed to much lower power. This means lower size transformator. But everybody have to make this decision on his own.
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Old 21st October 2012, 11:09 AM   #2693
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Quote:
Originally Posted by pergo View Post
seems this: http://www.tauscher-transformatoren..../pdf/hf_63.pdf
Rated 1.2kVA @100kHz in push pull mode.
THANX pergo is it suitable for half bridge smps? example ir2110 with SG ic?
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Old 21st October 2012, 11:29 AM   #2694
pergo is offline pergo  Italy
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yes, half bridge is a kind of push-pull
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Old 21st October 2012, 11:49 AM   #2695
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yes, half bridge is a kind of push-pull
THANK YOU
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Old 22nd October 2012, 06:11 AM   #2696
paskal9 is offline paskal9  Malaysia
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managed to make them stable enough that i've decided to case them up and use them as the resident sub amp.

the output inductor goes too hot after 2 hours of movie run with huge bass so i've added an 80mm fan blowing to the pcb. gonna find another fan and do a permanent installation. the output mosfets are mounted to a heatsink underneath the pcb. the blue pcb on the top right is a 2x4 balanced minidsp to provide all the necessary dsp processing to the amp.

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they're quad channel irs900d bridged into 2 channel powering a 4 ohm sub. switching frequency are reduced to 250khz, output inductor are made from T106-2 iron toroid with 21uh inductance. output mosfet are irfb5615.

each of the bridged channel powers one of these 15" diy sub:
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in room frequency response of the subs powered by the amp:
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stopped at 102db before i could see any compression limit on the sub. don't wanna break the house.
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Old 22nd October 2012, 06:18 AM   #2697
stewin is offline stewin  Kenya
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cool work paskal what voltage are you using ? and the amp channels are in bridgemode? do the outputs heat

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Originally Posted by stewin View Post
hi andrew pls post the pcb files of the irs3000d the one using bd 139 and 140 as buffers gate drivers

thanking you in advance stewin
hi michelle
the pcb files or the schematic please

Last edited by stewin; 22nd October 2012 at 06:36 AM.
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Old 22nd October 2012, 06:27 AM   #2698
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Hi Paskal,

What rail voltages did you use?
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Old 22nd October 2012, 07:55 AM   #2699
paskal9 is offline paskal9  Malaysia
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Quote:
Originally Posted by stewin View Post
cool work paskal what voltage are you using ? and the amp channels are in bridgemode? do the outputs heat
Quote:
Originally Posted by jlester87 View Post
Hi Paskal,
What rail voltages did you use?
i measured 52V-0-52V after rectification and caps bank. the toroid is 35-0-35 500VA.

for those of you guys that are considering about paralleling the output mosfet, i really don't think it's necessary. well unless you're gonna be driving them into 1 ohm. i'm only using irfb5615 rated at max 35A current and they have absolutely no problem into 2 ohm. they don't even heat up driving my subs at said volume.

and for what it's worth, more power are used to drive low frequency <80Hz compared to higher frequency. i really think a single pair of a relatively good mosfet stuck to a heatsink is enough. but that's just me.

to reduce the mosfet and ir2110 heat output to a minimum i've settle at 250khz switching frequency with 27 ohm gate resistor. i know some might argue that much gate resistance will increase thd but i found that higher gate resistor have no immediate effect to the sound quality of the sub.

higher gate resistor reduced the mosfet heat output to a bare minimum, reduced the idle current draw by about 20% (if i remember correctly) and reduced the ir2110 heat output considerably with no loss of sound quality that i can hear of. not scientific as i didn't exactly measure the SQ but changing back and forth between the 2 pcb i think i even prefer the pcb with 27 ohm gate resistor. maybe i'm bias but i still prefer minimum heat output compared to lower thd.
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Old 23rd October 2012, 03:57 AM   #2700
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Quote:
Originally Posted by paskal9 View Post
the output inductor goes too hot after 2 hours of movie run with huge bass so i've added an 80mm fan blowing to the pcb.
Hi,

What's the size of your inductor? Is it T106 or T130?

Regards,

Last edited by jlester87; 23rd October 2012 at 04:15 AM.
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