UCD 25 watts to 1200 watts using 2 mosfets

[Dzony988]

Thanks laci...

Can you suggest me level shifter values for high voltage operations? On example +-70V or higher... When level shifter transistor burns always explode transistor near by 120R..

I tryed with 2N5401, MPSA92 but I will try MJE350... I use 120R, 47K, 2x 2.2K like in original but always fail with +-70V on startup..

Can you suggest me good combination?

Thanks

 

[stewin]

hi all any smps experts

hi all i have managed to get my hands on a few old used ups . they had the below igbts . can any of them be useful with ee55 to give 3.5kwt ?

IRGP30B120KD-E , IRG4PH40UD2 , K30N60 , IRG4PF50WD , k40T120 , IRG4PC50U , IRG4PC40U ,

thanking you in advance

 

[NMOS]

my amp have 900W at 4 Ohm RMS

if output filter goes hot, what can do to solve problem ?

1. Change switching frequency from 200 to 350 khz

2. or change mosfets

 

[netiks]

Can Somebody post real pcb layout of IRS3000D I was looking layout of irs2000 and I am confused with some resistors I dont see on the original IRS3000d design but see on this Layout?
Regards

 

[netiks]

this is pcb from original irs3000d I found on internet I found only half
Its good for comparing
Regards

 

[Th3 uN1Qu3]

my amp have 900W at 4 Ohm RMS

if output filter goes hot, what can do to solve problem ?

1. Change switching frequency from 200 to 350 khz

2. or change mosfets

If output filter gets hot, you need a better core for the inductor. Or you can try to lower, not increase the switching frequency.

 

[paul_usa_22]

hy

Hi Dzony988,

yes I'm using LM311 and its a carrier based class d amp not UCD(self osc).fsw=250KHz or you can change fsw and no noise issues. if you want it PM me

Regards
MANOJ

can u please send me the pcb and schematic.thank you

 

[prasanna gunasinhe]

bump

 

[Dimonis]

my amp have 900W at 4 Ohm RMS

if output filter goes hot, what can do to solve problem ?

1. Change switching frequency from 200 to 350 khz

2. or change mosfets

It heats at idle or at good power ? What heats more - the core or the winding?

 

[stewin]

my current project i decided to go non ucd way

 

[manojtm]

i decided to go non ucd way

Hi Stewin,

Sigma Delta design is good for all

NB: using BIAS +15V you should reduce the value R13 to @250KHz FSW range

Regards
MANOJ

 

[Hadighorbani]

Hi
i need botome layer for sir manuj amp
please share it and power board too.
i was attached the PDF file.
thanks

 

[stewin]

Hi Stewin,

Sigma Delta design is good for all

NB: using BIAS +15V you should reduce the value R13 to @250KHz FSW range

Regards
MANOJ

thanks sir manoj originally i had planned to use irfb4227 or irfp4668 .but since i am using irfp250n i will change the swithching frequency.
also i wanted to reduce fsw by using 820ohms to about 200 khz so as to drive the amp harder .

. thanks again for the correction. i will post the smps i am developing .

 

[andrewlebon]

audio limiter

Hello
greetings finally added input limiter to my amp
warm regards
andrew lebon

 

[pergo]

very nice Andrew! Sounds good?

 

[stewin]

hi andrew in most of your projects you use smps 1200., just wondering how is the perfomance , stability with heavy loads and does it have any issues with smps switching noise?

 

[andrewlebon]

Hi Steven
greetings smps 1200 is ok for single pair classd amp torridal used is same like detex uses his 3kw smps using TL494 IS WORKING also
warm regards
andrew

 

[andrewlebon]

detex 3kw smps

Hi Steven
detex smps is now working today i do some load tests
warm regards
andrew

 

[netiks]

Hi Steven
detex smps is now working today i do some load tests
warm regards
andrew

Hello adrew can You please post detex smps 3kw with TL494 layout pcb
thanks

 

[fhoenix]

Hello adrew can You please post detex smps 3kw with TL494 layout pcb
thanks

yes, i like this smps