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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th April 2010, 05:33 PM   #231
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Originally Posted by DJ_DUMY View Post
hi
I designed a PCB for this amplifier but I replace transistors with two driver circuits if you have something better please send to me at gabriel_seku@yahoo.com
Wow, that is a nice looking board. Very clean, and logical. Well done!

Jim
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Old 27th April 2010, 04:18 AM   #232
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Yeah, nice looking for classAB fans, but useless for classD.
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Old 27th April 2010, 11:02 AM   #233
iand is offline iand  United Kingdom
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Originally Posted by Eva View Post
With good PCB layout and gate drive, MOSFET can be used at nearly it's rated Vds, and on the other hand, higher voltage devices have higher capacitances and impose a lot of restrictions on how their body diode can be used. So using parts with higher Vds than required is not a good idea.

Most MOSFET rated at 100V and less will handle body diode hard switching without problem. Some 150V parts are suitable too. With well controlled di/dt, a few 200V/250V ones, and very few 500V/600V ones will handle it too, but charge storage results in high losses on the latter. All higher voltage parts would need external diodes.

IRFB4227 and IRFB4127 are rated at 200V and still can handle hard switching with reasonably low losses. Also, low Rds-on allows to bypass the body diode up to a certain current level (depends on temperature). In my current project, body diodes are only used with 2 ohm load.
Eva, I don't think that all higher voltage parts would need external diodes.

There are 500V/600V MOSFETS available now with very low Qrr/Trr body diodes, the best ones I can find are from Fairchild -- for example:

FDPF16N50UT 500V 16A 0.48ohms trr=65ns qrr=100nC
FDPF10N60ZUT 600V 10A 0.8ohms trr=45ns qrr=52nC

With these (paralleled up) and a fast 500V gate driver you could build a multi-kilowatt half-bridge, which is then bridgeable for truly ludicrous power levels.

Ian
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Old 27th April 2010, 11:09 AM   #234
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Old 27th April 2010, 11:58 AM   #235
iand is offline iand  United Kingdom
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Originally Posted by nigelwright7557 View Post
6000watts is too much for a household socket.

You would need at least two supply lines or a 3 phase input.
Only if you want to output continuous sinewaves, which most people would say isn't music ;-)

Fuses and circuit breakers will typically withstand double their rated current for at least 10 seconds.

So even playing the most heavily compressed music with long sustained bass notes, you can safely run a 6kW class-D amplifier from a 3kW socket.
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Old 27th April 2010, 12:13 PM   #236
81bas is offline 81bas  Germany
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Originally Posted by iand View Post
FDPF16N50UT 500V 16A 0.48ohms trr=65ns qrr=100nC
FDPF10N60ZUT 600V 10A 0.8ohms trr=45ns qrr=52nC

With these (paralleled up) and a fast 500V gate driver you could build a multi-kilowatt half-bridge, which is then bridgeable for truly ludicrous power levels.

Ian
to build multi-kilowatt half bridge, it is needed to parallel about 10 of such devices for each rail (20 total), I suppose
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Old 27th April 2010, 12:57 PM   #237
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Originally Posted by 81bas View Post
to build multi-kilowatt half bridge, it is needed to parallel about 10 of such devices for each rail (20 total), I suppose
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Old 27th April 2010, 01:04 PM   #238
iand is offline iand  United Kingdom
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Originally Posted by 81bas View Post
to build multi-kilowatt half bridge, it is needed to parallel about 10 of such devices for each rail (20 total), I suppose
Indeed, but they cost less than a dollar each (1000-off), and more parallel devices decreases the package inductance (a single T0220 is ~7nH) for faster switching and less overshoot. It's not difficult getting a lot of TO220s into a small PCB area under a single heatsink, for example using aluminium U-section bars, or just clamping rows of transistors interleaved with rectangular aluminium bars to make a stack which then bolts to a heatsink.

Some hefty gate drivers would be needed, but the Zetex ones are very fast and high current (and cheap!) and reduce the dissipation in the driver chip.

Ian

Last edited by iand; 27th April 2010 at 01:06 PM.
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Old 27th April 2010, 01:09 PM   #239
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Originally Posted by iand View Post
Indeed, but I expect they're only a couple of dollars each, and more parallel devices decreases the package inductance (a single T0220 is ~7nH) for faster switching and less overshoot. It's not difficult getting a lot of TO220s into a small PCB area under a single heatsink, for example using aluminium U-section bars, or just clamping rows of transistors interleaved with rectangular aluminium bars to make a stack which then bolts to a heatsink.

Some hefty gate drivers would be needed, but the Zetex ones are very fast and high current (and cheap!) and reduce the dissipation in the driver chip.

Ian
High Density Cells could be formed using TO-220[No Row type mounting]and discrete drivers comes in handy to drive them Wild......!!!
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Old 27th April 2010, 01:40 PM   #240
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Originally Posted by ionutgaga View Post
Yeah, nice looking for classAB fans, but useless for classD.
Ouch! It may not be optimum, but I doubt it is "useless".
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