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DLH Amplifier: The trilogy with PLH and JLH amps
DLH Amplifier: The trilogy with PLH and JLH amps
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Old 27th May 2018, 06:48 PM   #491
xrk971 is online now xrk971  United States
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DLH Amplifier: The trilogy with PLH and JLH amps
Very nice Prasi - beautiful work.

If one simply leaves the 3 extra MOSFETs unpopulated, put IXYS on single pair with heatpipes could work too. Board would be much smaller. Probably 100mm square even.
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Old 27th May 2018, 08:59 PM   #492
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DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-frecuency-8-ohms-1-jpg

DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-output-power-8-ohms-1-khz-jpg
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Old 27th May 2018, 09:34 PM   #493
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-frecuency-4-ohms-1-jpg

DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-output-power-4-ohms-1-khz-jpg
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Old 27th May 2018, 10:58 PM   #494
diegomj1973 is offline diegomj1973  Argentina
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DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-frecuency-2-ohms-1-jpg

DLH Amplifier: The trilogy with PLH and JLH amps-dlh-power-thd-vs-output-power-2-ohms-1-khz-jpg

All the simulations were carried out for the same position of the 2K5 trimpot, that is, 66% of its total displacement (considering a trimpot of linear variation). It could happen that at other adjustment positions, according to the output load, the profile of the distortion takes on both an appearance and a different value.

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Old 28th May 2018, 12:07 AM   #495
AKSA is offline AKSA  Australia
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Horacio,

Prasi has done a beautiful pcb, I agree, he is quick too and considers all the electrical issues very well....... we are lucky at DIYaudio, aren't we?

The problem with multiple pairs is matching. Difficult to match four pairs; you would need at least 50 to select from, and you would have to measure them quickly to avoid thermal warmup, which hugely changes Vgs at the selected quiescent. A big pair of monsters is always better and there are some very good ones, like the IXYS 1040W devices. Here are 18 IXYS devices, Pmos and Nmos, with 90-140A and 960W to 1060W. All are suitable for your DLH, although you might want to reconsider the gate drive requirements carefully. These are designed for tractive/propulsive/smps application, I believe; but they move pretty quickly if you can move the charge into and out of the gate swiftly. These devices have outrageous transconductance, which is pretty good in linear operation as it reduces the compressive distortions.

Ciao,

Hugh

IXFX100N65X2 IXYS MOSFET N-CH 650V 100A PLUS247 137 - Immediate
AU$20.19000 1 Tube? HiPerFET™ Active N-Channel MOSFET (Metal Oxide) 650V 100A (Tc) 10V 5.5V @ 4mA 180nC @ 10V ±30V 11300pF @ 25V- 1040W (Tc) 30 mOhm @ 50A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXFX140N30P IXYS MOSFET N-CH 300V 140A PLUS 247 174 - Immediate
AU$25.31000 1 Tube? HiPerFET™, PolarP2™ Active N-Channel MOSFET (Metal Oxide) 300V 140A (Tc) 10V 5V @ 8mA 185nC @ 10V ±20V 14800pF @ 25V
1040W (Tc) 24 mOhm @ 70A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXTX90N25L2 IXYS MOSFET N-CH 250V 90A PLUS247 125 - Immediate
AU$39.65000 1 Tube? Linear L2™ Active N-Channel MOSFET (Metal Oxide) 250V 90A (Tc) 10V 4.5V @ 3mA 640nC @ 10V ±20V 23000pF @ 25V
960W (Tc) 33 mOhm @ 45A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXFK140N25T IXYS MOSFET N-CH 250V 140A TO264 150 - Immediate
AU$18.04000 1 Tube? GigaMOS™ Active N-Channel MOSFET (Metal Oxide) 250V 140A (Tc) 10V 5V @ 4mA
255nC @ 10V ±20V 19000pF @ 25V
960W (Tc) 17 mOhm @ 60A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264AA (IXFK) TO-264-3, TO-264AA

IXTK90N25L2 IXYS MOSFET N-CH 250V 90A TO-264 26 - Immediate
AU$37.41000 1 Tube? Linear L2™ Active N-Channel MOSFET (Metal Oxide) 250V 90A (Tc) 10V 4.5V @ 3mA 640nC @ 10V ±20V 23000pF @ 25V 960W (Tc) 33 mOhm @ 45A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264 (IXTK) TO-264-3, TO-264AA

IXFK100N65X2 IXYS MOSFET N-CH 650V 100A TO-264 75 - Immediate
AU$20.52000 1 Tube? HiPerFET™ Active N-Channel MOSFET (Metal Oxide) 650V 100A (Tc) 10V 5.5V @ 4mA 180nC @ 10V ±30V 11300pF @ 25V 1040W (Tc) 30 mOhm @ 50A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264 TO-264-3, TO-264AA

IXTX102N65X2 IXYS MOSFET N-CH 650V 102A X2 PLUS247 73 - Immediate AU$21.06000 1 Tube? Active N-Channel MOSFET (Metal Oxide) 650V 102A (Tc) 10V 5V @ 250µA 152nC @ 10V ±30V 10900pF @ 25V 1040W (Tc) 30 mOhm @ 51A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3


IXTK110N20L2 IXYS MOSFET N-CH 200V 110A TO-264 61 - Immediate
AU$39.97000 1 Tube? Linear L2™ Active N-Channel MOSFET (Metal Oxide) 200V 110A (Tc) 10V 4.5V @ 3mA
500nC @ 10V ±20V 23000pF @ 25V 960W (Tc) 24 mOhm @ 55A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264 (IXTK) TO-264-3, TO-264AA

IXFX120N30T IXYS MOSFET N-CH 300V 120A PLUS247 30 - Immediate
AU$17.81000 1 Tube? GigaMOS™ Active N-Channel MOSFET (Metal Oxide) 300V 120A (Tc) 10V 5V @ 4mA 265nC @ 10V ±20V 20000pF @ 25V 960W (Tc) 24 mOhm @ 60A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXTK102N65X2 IXYS MOSFET N-CH 650V 102A X2 TO-264 64 - Immediate
AU$21.42000 1 Tube? Active N-Channel MOSFET (Metal Oxide) 650V 102A (Tc) 10V 5V @ 250µA 152nC @ 10V ±30V 10900pF @ 25V 1040W (Tc) 30 mOhm @ 51A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264 (IXTK) TO-264-3, TO-264AA

IXFH94N30P3 IXYS MOSFET N-CH 300V 94A TO-247 38 - Immediate
AU$15.16000 1 Tube? HiPerFET™, Polar3™ Active N-Channel MOSFET (Metal Oxide) 300V 94A (Tc) 10V 5V @ 4mA 102nC @ 10V±20V 5510pF @ 25V 1040W (Tc) 36 mOhm @ 47A, 10V -55°C ~ 150°C (TJ) Through Hole TO-247 TO-247-3

IXTX110N20L2 IXYS MOSFET N-CH 200V 110A PLUS247 13 - Immediate
AU$39.65000 1 Tube? Linear L2™ Active N-Channel MOSFET (Metal Oxide) 200V 110A (Tc) 10V 4.5V @ 3mA
500nC @ 10V±20V 23000pF @ 25V 960W (Tc) 24 mOhm @ 55A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXFK140N30P IXYS MOSFET N-CH 300V 140A TO-264 0
AU$25.04000 1 Tube? HiPerFET™, PolarP2™ Active N-Channel MOSFET (Metal Oxide) 300V 140A (Tc) 10V 5V @ 8mA 185nC @ 10V±20V 14800pF @ 25V 1040W (Tc) 24 mOhm @ 70A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264AA (IXFK) TO-264-3, TO-264AA

IXFX140N25T IXYS MOSFET N-CH 250V 140A PLUS247 0 Standard Lead Time 24 Weeks AU$14.59800 30 Non-Stock? Tube? GigaMOS™ Active N-Channel MOSFET (Metal Oxide) 250V 140A (Tc) 10V 5V @ 4mA 255nC @ 10V±20V 19000pF @ 25V 960W (Tc) 17 mOhm @ 60A, 10V -55°C ~ 150°C (TJ) Through Hole PLUS247™-3 TO-247-3

IXFK120N30T IXYS MOSFET N-CH 300V 120A TO-264 0
Standard Lead Time 26 Weeks AU$14.78920 25 Non-Stock
? Tube? GigaMOS™ Active N-Channel MOSFET (Metal Oxide) 300V 120A (Tc) 10V 5V @ 4mA 265nC @ 10V ±20V 20000pF @ 25V 960W (Tc) 24 mOhm @ 60A, 10V -55°C ~ 150°C (TJ) Through Hole TO-264AA (IXFK) TO-264-3, TO-264AA
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Last edited by AKSA; 28th May 2018 at 12:25 AM.
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Old 28th May 2018, 12:09 AM   #496
kokoriantz is offline kokoriantz  Lebanon
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Old 28th May 2018, 05:26 AM   #497
kokoriantz is offline kokoriantz  Lebanon
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xrk971, did you ask yourself the question, why PA amplifiers don't use overclocker's heat sink? Ok ,you are replacing the air filters time to time ,changing the fans every 3or 4 years (yearly on sea cost) . But the layer of grease, accumulated on the foils by kitchen vapor and air pollution, how do you clean it up ? At the gas station?
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Old 28th May 2018, 10:42 AM   #498
prasi is offline prasi  India
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DLH Amplifier: The trilogy with PLH and JLH amps
Thank you guys, I will wait for further developments for this amp.

Regards
Prasi
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Old 28th May 2018, 05:11 PM   #499
xrk971 is online now xrk971  United States
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DLH Amplifier: The trilogy with PLH and JLH amps
Quote:
Originally Posted by kokoriantz View Post
xrk971, did you ask yourself the question, why PA amplifiers don't use overclocker's heat sink? Ok ,you are replacing the air filters time to time ,changing the fans every 3or 4 years (yearly on sea cost) . But the layer of grease, accumulated on the foils by kitchen vapor and air pollution, how do you clean it up ? At the gas station?
In fact, PA amps use tunnel heatsinks and large fans and air filters much like a rack mounted sever PC. Have you seen the inside of a Pro Class AB?

Here is Behringer EP4000:
Click the image to open in full size.

And Mackie EM4000:
Click the image to open in full size.

They don’t use cpu heatpipes because they spread the load over many MOSFETs. But a CPU cooler would be no different than cleaning a PC case once a year assuming you leave it on all the time. Which we don’t. Class AB amps that draw 400w are o Lt turned on a few hours at a one during listening sessions to save electricity.
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Old 28th May 2018, 05:43 PM   #500
bogdan_borko is offline bogdan_borko  Serbia
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After 50 pages of the thread, you are making plans for pcb but there is no working proto? The circuit is very simple for point to point prototype.
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