UCD 25 watts to 1200 watts using 2 mosfets

[andrewlebon]

IRFP4768 D CLASS

Nice work sameer

 

[stewin]

Please post your layout and schema couse mine is not working..
Regards

also andrew pls post for the amp and smps

 

[xrk971]

I'm new here, can someone point me to the post with good schematic (post #13?). Is there a BOM available with part numbers? Sorry, looks interesting but I can't go through all posts now.
Thanks in advance,
X

 

[NMOS]

Nice work sameer

IRFP 4768 D class can you send me PCB file or schematic with totem pole from this amp ?

phoonpool@googlemail.com

 

[wattaniya]

hi andrewlebon,
for class d amps can i use etd transformer type instead torroid.

 

[Tekko]

You can if you airgap the core, but i dont see the point using a etd core over a toroid.

 

[andrewlebon]

Hi Nazirdigi
greetings try orignal cores from good companies some chinese companies sent me samples lol none were good had bad experience
warm regards
andrew lebon

 

[akraj]

Hi Nazirdigi
greetings try orignal cores from good companies some chinese companies sent me samples lol none were good had bad experience
warm regards
andrew lebon

How about the products from Infantron Singapore- Micrometals, Iron Powder Core, Bobbins, Winding Machine, Transformer, Wire Any idea?

 

[andrewlebon]

How about the products from Infantron Singapore- Micrometals, Iron Powder Core, Bobbins, Winding Machine, Transformer, Wire Any ideA
MICROMETALS best company for iron powder cores
warm regards
andrew lebon

 

[akraj]

How about the products from Infantron Singapore- Micrometals, Iron Powder Core, Bobbins, Winding Machine, Transformer, Wire Any ideA
MICROMETALS best company for iron powder cores
warm regards
andrew lebon

Seems I knocked at right place. They are the distributor of Micrometal!! Micrometals - Iron Powder Cores

Check out the link.

 

[norazmi]

the core i already tested with amidoncorp and i`ve ordered 50 pcs T106-2, all good.

 

[Tekko]

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

 

[Tekko]

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!!

 

[andrewlebon]

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

 

[Tekko]

Well i got one power module together for testing:

 

[xrk971]

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)?

 

[CPX]

@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.

 

[Tekko]

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.

 

[Tekko]

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.

 

[chago25]

Nice work sameer

can i have this files?