UCD 25 watts to 1200 watts using 2 mosfets

[redmx]

the project advances, already corrected some faults in the PCB, ready to do a few more, the small card is a modulator / demodulator with balanced input and output for LO and HI for the 4 mosfets, but the main card can be UCD, DELTA SIGMA auto oscillating, or double feedback, post filter and pre-filter feedback, basically universal, I will soon post the PCB and schematics only of the main board and the UCD and delta sigma versions.

 

[Ryssen]

how many turns on toroid ferrite to get 22uH?
Shall I use a 30mm toroid??
for the output inductor

 

[sweetperfume]

You have to specify the material used. Manufacturer and grade of ferrite for someone to make calculations of turns.

 

[Ryssen]

Or if I have an nstrument that messaures uH i can use that.

 

[ionutzxpo]

mini ring core calculator! use it! 🙂

 

[Dbnn]

ive use my own schema stewin and because its for production i cannot shared it yet

is CIA top secret archive?

 

[redmx]

The evolution

Advances in the project ........ 1,800 RMS .008 DHT + noise etc you would need to hear it, it is wonderful, only unipolar source from 40 VDC to 140 vdc

 

[Roby Tengara Setiawa]

It's My Project " Class D UcD Super Lite Discrete "
Schematic by Mr. Kartino Surodipo

Test Kit Power Amplifier Class D UcD Super Lite Discrete with New Gate Mosfet Driver - YouTube

 

[NMOS]

yes I made also Class D SMD UcD PCB with latest Kartino schematic updates from FB Group

PCB designed in Germany during Covid-19 lockdown since 11-2020 up to

 

[nigelwright7557]

High RDSon isnt a problem unless driving amp to near the rails.

RDSon is most important in switching applications when the mosfet is hard on and you want to consume minimum power in the mosfet for heat and SOA reasons.

 

[kartino]

RDS ON now is not really problem
Full load is always temporary.

 

[stewin]

the lm311 post and pre feedback project is coming up......

any opinions and comments are appreciated.

project details in the below forum

Class D Amp with LM566, LM393 and 2XIRF530

 

[DesignatedDriver]

Hello to all! Sorry for my English. The problem of connecting several class D amplifiers (UcD) to a single power source is solved simply, it is necessary to power each amplifier plus power and minus power through separate diodes (for example, MBR30200CT). Thus, I connected four channels from one source and everything works fine. Sincerely, Boris B.

Im also trying to figure out whether I can connect two class D amps, TPA3255, to a single SMPS PSU.

Here is a picture of the MBR30200CT


So are both the + and - leads of each amp simply connected in series with such a diode (4 diodes total) and the connection is made between pins 1or3 and 2?

This would be enough to prevent any interaction making it through the filter caps of two unsynchronized switching amps, correct?

 

[kartino]

the lm311 post and pre feedback project is coming up......

any opinions and comments are appreciated.

project details in the below forum

Class D Amp with LM566, LM393 and 2XIRF530

Hi Stewin,

I have finished double feedback. Here my Schematic if you interested.

Basically this is standard IR based, but the key is use higher LPF cap 1uF instead of 680n or 470n to lower the ripple so that during start it will not take over switching oscillation (usually get 60-70kHz if oscillation failed).
Double feedback you need to be careful of fail start. It can damage your speaker. SO I add Fail Switching protection

This is firm design. PCB available in indonesia.

 

[Raichu]

Have you considered synchronizing them (using the OSC_IOP and OSC_IOM pins)?

Im also trying to figure out whether I can connect two class D amps, TPA3255, to a single SMPS PSU.

Here is a picture of the MBR30200CT
View attachment 955762

So are both the + and - leads of each amp simply connected in series with such a diode (4 diodes total) and the connection is made between pins 1or3 and 2?

This would be enough to prevent any interaction making it through the filter caps of two unsynchronized switching amps, correct?

 

[thimios]

Hi Stewin,

I have finished double feedback. Here my Schematic if you interested.

Basically this is standard IR based, but the key is use higher LPF cap 1uF instead of 680n or 470n to lower the ripple so that during start it will not take over switching oscillation (usually get 60-70kHz if oscillation failed).
Double feedback you need to be careful of fail start. It can damage your speaker. SO I add Fail Switching protection

This is firm design. PCB available in indonesia.

Is it a pcb for sharing?

 

[kartino]

Is it a pcb for sharing?

No, you can buy if you in indonesia from someone selling it (not from me).
Or if you are in Malay, Brunei or Philippine.

 

[thimios]

Thanks,but i live in Greece. 🙂

 

[DesignatedDriver]

Hello to all! Sorry for my English. The problem of connecting several class D amplifiers (UcD) to a single power source is solved simply, it is necessary to power each amplifier plus power and minus power through separate diodes (for example, MBR30200CT). Thus, I connected four channels from one source and everything works fine. Sincerely, Boris B.

Have you considered synchronizing them (using the OSC_IOP and OSC_IOM pins)?

No, is it really as simple as connecting one or two wires between them?

Edit: found *Multi-Device Configuration for TPA32xx Amplifiers" with keywords from your reply. Thanks!

 

[Bigun]

Thanks,but i live in Greece. 🙂

maybe you design a Greek pcb but even better, with triple feedback! 😀