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Old 11th June 2013, 12:27 PM   #1
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Default Class D module needed

Hello, I am in need of a good class D half bridge module that can work up to +/- 110VDC (250V MosFET and driver), ~1200W into 4 Ohms, is cost-effective, does not need any additional housekeeping supply (for ease of use),... any suggestions? My Class AB Sony SRP-P450 has exploded into a cloud of smoke - only the PSU is still good - this gives a stable +/- 103VDC. I am not willing to deal with bipolar transistors trying to get that inefficient AB design running again. Any suggestions?
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Old 11th June 2013, 12:58 PM   #2
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Check out the IRF range. There are a couple of easy build class D amps by International Rectifier.
Try the IRS20957S on the IRF.com site
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Old 11th June 2013, 01:04 PM   #3
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Sorry for the misunderstanding - I need a fully working module, not just a driver or some components (no time at hand to get it running - just plug and play). The IR modules of IRAUDAMP.... only use 200V MOS - I need a ready working module with 250V components (2 modules to be precise), since the PSU gives 2 x 103VDC, unfortunately.
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Old 11th June 2013, 01:06 PM   #4
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The IRS20957 is way too low voltage at just 100V max for viennatom's 103V split supply (206V total) Even the old IR2010 is a bit low at 200V.
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Old 11th June 2013, 01:08 PM   #5
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https://www.hypexshop.com/DetailServlet?detailID=3538 <-- maybe this could withstand your psu.
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Old 11th June 2013, 01:54 PM   #6
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Hello Tekko, UCD2K is a full bridge using 200V MOS, I need a half bridge with 250V MOS.
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Old 11th June 2013, 02:18 PM   #7
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Well then diy is the only option because i do not know of any class d modules out there that take more than 80-90v rails.
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Old 11th June 2013, 02:22 PM   #8
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This may be true, but I dont like to hear that. The 2x 103V is only on no load, since the toroid 50Hz transformer is weak during load condition. Under full load it is well below 200V, but still - 200V devices can not be applied. ;-(
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Old 11th June 2013, 02:41 PM   #9
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You still need the 250V rated devices as the amp module on idle will not draw enough to get the voltage down from the 103 noload volts per rail.

I think theres a reason for there beeing no class d modules available that takes 100+ volts per rail, simply determined too dangerous even for experienced diyers, and thus why the high power class d comes as fullbridge running at half the rail voltage of a halfbridge.

And i can understand you you don't wanna diy from scratch, i was too very nervous the first time i threw the switch on my BIG class d project running 2x85V rails.
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Old 11th June 2013, 03:03 PM   #10
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looks like I ll have to repair the bipolar AB stage...
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