2 kwts discreet class d need help

[irvynejay]

ok i already have several class d amp base on ir 2110 i just want to use 2 to 3 pairs by adding toten pole so that the ir2110 wont get stress ,,i want to use irfb4227 2 to3 pairs, now i use 2 pairs irfp250 it works good but i notice ir2110 is bit hot ...Does my schematic is correct only value are wrong?

I'm too newbie for this sorry

 

[irvynejay]

re edit

norazmi ,,pls see correction if its correct many thanx

 

[pergo]

you need some pull down resistors, and increase the bootstrap cap C1 to not less 47uF. I suggest BD139-BD140 instead of 2x2n5551 and 2x2n5401. BDs are 1.5A continuous current.

 

[norazmi]

yup BD`s trans is good too, even u can double it. make it 3A cont current. You can always use 2N or BD`s trans depends what u have with you, benefit is with 2N u will need more than BD`s because 2N only have 600ma current. So BD`s trans will save ur space. I`m still design ltspice simulation and not finish yet. with totem pole ir2110 chip will run more cool because of totem pole driver take place to supply current at mosfet gate.

 

[norazmi]

opss, im forgot, u need 10k resistor from gate to source for each mosfet after 4.7 ohm resistor.

 

[irvynejay]

v1

im grateful for your replies norazmi, pergo and stewin

re edit pls verify

What about MJE340/350 can it be used?

 

[pergo]

i love MJE!

p.s: need pull down also at the IR outputs

 

[irvynejay]

Pergo mje340/350 have 500ma collector current and bd139/140 has 1.5a which is good to use

and what do you mean (p.s: need pull down also at the IR outputs)

can you draw simple schematic pls

 

[pergo]

sorry i think at MJE243G and 253G 4 Amperes


I don't know if IR2010 has internal pull down resistor at its output. If not, 100k resistor is fine (from pin7 to pin5, and from pin1 to -90V)

 

[norazmi]

mje340/350 is slow when working with high freq and not fast enough. it may cause overheat on it. BDs is ok. But u can try it with small power like +/- 30 vdc for testing. The simulation work good with totem pole but i do with dual aux supply.

 

[irvynejay]

toten

Thanx norazmi on what part you use dual supply..?? can you draw schematic pls

found new but i dont know if it works

 

[pergo]

mje243/253 are 40MHz device

 

[irvynejay]

pergo do you advice to use that transistors?i can get those and try i just need confirmation if my post on #306 is correct

 

[norazmi]

irvy, u can use double bd139 and 140 per side. So u can have 3 ampere already. Dual aux supply for the +15 vdc for each side, hi and lo.

 

[irvynejay]

with aux supply and db

norazmi ty pls check,,what about the ground of auxiliary supply is this correct?

 

[pergo]

pergo do you advice to use that transistors?i can get those and try i just need confirmation if my post on #306 is correct

for me, yes, no problem with MJE243G or MJE253G.


p.s: previously i wrote BD441 and BD442. They're good up to 200kHz (tested). For higher f_oscillation i can't test them. They are 3MHz-only device.

 

[irvynejay]

ok thanks ill collect some parts then will try to test all of the transistor whats the best suite for it,,

 

[norazmi]

Irvy yup, nice schema, remember to have aux supply feed with -ve and GND like usual by using mje13007 or any higher voltage npn transistor.

 

[pergo]

in Ucd technology RC output snubber is no needed. C3 R10 in the irvy schema.

 

[norazmi]

in Ucd technology RC output snubber is no needed. C3 R10 in the irvy schema.

Yep it can be remove, i didnt use any RC at output with all my class D amp.