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Old 30th March 2013, 06:34 PM   #3371
norazmi is offline norazmi  Malaysia
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the core i already tested with amidoncorp and i`ve ordered 50 pcs T106-2, all good.
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Old 31st March 2013, 10:26 PM   #3372
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I was bored so i decided to revisit the UcD in this thread that i originally built about two years ago.

The circuit: http://i.imgur.com/zmhrLOm.png

The actual amp, i decided to split it into a modulator module and a power module: UcD type Class D amplifier - YouTube
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Old 2nd April 2013, 02:51 PM   #3373
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Anyone has a guess on how hot a 3A(source/sink) gate driver such as IR2010 or FAN7392 will get with 20 ohm gate resistor and mosfets with a total gate charge of 100nC at 400kHz ?

At 400ish kHz even with 30nC gate charge(IRF540) a IR2010 gets pretty hot.

Something tells me this will not even work at all.

These gate currents are scary!!
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Last edited by Tekko; 2nd April 2013 at 03:03 PM.
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Old 2nd April 2013, 04:19 PM   #3374
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Hi Tekko
greetings how accurate are LT SPICE stimulation results i have never used spice
need to stimulate a small d class amp input is TLO71 rest are trs
warm regards
andrew lebon
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Old 2nd April 2013, 04:34 PM   #3375
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Well i got one power module together for testing:
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Old 2nd April 2013, 05:17 PM   #3376
xrk971 is offline xrk971  United States
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That's a darn small and compact 1200 watt class D amp if it works. Nice job! Is this the same circuit as in Post #13(around there)?
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Old 2nd April 2013, 05:45 PM   #3377
CPX is offline CPX  Romania
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@Tekko
Hot(>80 degrees) without active cooling.
With 100nC mosfets you must use a lower resistance(4 ohm) because rise time will increase to much(>150ns) and you will lose efficiency.
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Old 2nd April 2013, 05:55 PM   #3378
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Quote:
Originally Posted by xrk971 View Post
That's a darn small and compact 1200 watt class D amp if it works. Nice job! Is this the same circuit as in Post #13(around there)?
Note that this is a power module only, no modulator. However i have tested it now and at first glance i can say the protoboard prototype sounded better.

Also i do need to lower the gate resistors as on 2x25VDC the heatsink is already getting warm, but 6 minutes near clipping did however not heat it excessively.
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Old 2nd April 2013, 06:32 PM   #3379
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So i halved the gate resistors by adding a second 22ohm on top of the existing one and now the amp is HOT.

IRFP150 is NOT a good dtransistor for class d!! Its quite the opposite, a clunky old piece of silicon, as soon as i get some better fets they'll be replaced.

Last edited by Tekko; 2nd April 2013 at 06:35 PM.
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Old 3rd April 2013, 07:22 AM   #3380
chago25 is offline chago25  Philippines
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Quote:
Originally Posted by andrewlebon View Post
Nice work sameer
can i have this files?
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