MY DESIGN L20D IRS2092+IRFI4020H 200W8R

[skood]

What's your application for the L20D modules?

3way active speaker , It's not specified the output of the smps 1000 (amps) only volts ; also there doesn't seem to be a specific requirement for the L20d either ...,

the other option is to go for a linear psu

[MrSlim]

Originally Posted by exipnos

Thank you for an excellent clear answer. I will be building my speakers soon and while they are 8 ohm, I will have wiring done to run them as 8ohm or 4ohm. I'm leaning towards choosing the 60V supply. Is there any quality differences if you are running amps at 8 or 4 ohm? Or is the only factor to consider how much power/distortion they play at?

Since the L20 and L15 are the same design, then they should sound the same, so yes, the basic difference will be how much power you get before distortion rears its ugly head.

[jlester87]

Hi LJM,

Can I use the L25D as subwoofer amp, 4 ohm 250w continuous for PA (without overheating)? what would be the recommended (safe) voltage?

Thanks

[lithoc]

Originally Posted by jlester87

Hi LJM,

Can I use the L25D as subwoofer amp, 4 ohm 250w continuous for PA (without overheating)? what would be the recommended (safe) voltage?

Thanks

Hi,

Here's some guideline for you

[HiroPro]

Originally Posted by lithoc

Hi,

Here's some guideline for you

Hey that's a fantastic post and info I really wanted to know.

THANK YOU

[lithoc]

Originally Posted by HiroPro

Hey that's a fantastic post and info I really wanted to know.

THANK YOU

Thanks

Here's the new catalog from IRF, its all inside with the new IR43xx integrated class-d "chipamp"

http://www.irf.com/product-info/sele...de/sg11453.pdf


However, the graph is a bit conservative with their "clipping power rating" and contradic with LJM claims for L25D for 4020H of 350W @ 4ohm. Which its not archivable according to the graph

[ljm_ljm]

Is.If you can make your amplifier work at lower temperatures. Temperature, the active heatsink (fan). They can have more power.

On the contrary, if the temperature is relatively high, that their power will be lower than the rated output power.

The L25D rated power is 250W 8R.
If your speaker is 4 ohms, its output voltage will be smaller, you can lower powered L15D.

Reduce the voltage in the power, power unchanged, the current will be greater, more suitable for low impedance loads.

[peter911]

Hello, everyone!
I am Hungarian, and the English is not easy for me. Help me "google translate" !
I hope you understand what I write unto you!
Two question unto you:
1., Someone is L25D to the L20D, or the PCB schematic in pdf format? Could be here to download? Top side, botom side and layer schematic? Also helps me download link...
2., Is it possible to replace the "Digital Audio Mosfet" from "Fast Switch Power Mosfet"? IRFB4212PBF ===> IRF3007, or P140NF75 (of course, only up to -/+75 Voltage)
data sheet: http://www.irf.com/product-info/data...ta/irf3007.pdf
and: P140NF75 datasheet pdf datenblatt - STMicroelectronics - N-CHANNEL 75V - 0.0065 ohm -120A DPAK/IPAK/TO-220 STripFET II POWER MOSFET ::: ALLDATASHEET :::

Thank you for your answers!

[MrSlim]

Originally Posted by peter911

Hello, everyone!
I am Hungarian, and the English is not easy for me. Help me "google translate" !
I hope you understand what I write unto you!
Two question unto you:
1., Someone is L25D to the L20D, or the PCB schematic in pdf format? Could be here to download? Top side, botom side and layer schematic? Also helps me download link...
2., Is it possible to replace the "Digital Audio Mosfet" from "Fast Switch Power Mosfet"? IRFB4212PBF ===> IRF3007, or P140NF75 (of course, only up to -/+75 Voltage)
data sheet: http://www.irf.com/product-info/data...ta/irf3007.pdf
and: P140NF75 datasheet pdf datenblatt - STMicroelectronics - N-CHANNEL 75V - 0.0065 ohm -120A DPAK/IPAK/TO-220 STripFET II POWER MOSFET ::: ALLDATASHEET :::

Thank you for your answers!

The L15,20 and 25 are all based on IRAUDAMP7S reference design. Please see page 30 of the PDF for the schematic diagram. Ljm_ljm did not include the over/under voltage protection in his design.

The design does not use the IRFB4212PBF which is a "single" MosFET, it uses the irfi4212h-117p which is a MosFET Half Bridge containing two MosFETS. These devices have been optimized for Class D Audio, so if you change the design to use two single MosFETS, you may not get the results you expect.

[lithoc]

Originally Posted by MrSlim

The L15,20 and 25 are all based on IRAUDAMP7S reference design. Please see page 30 of the PDF for the schematic diagram. Ljm_ljm did not include the over/under voltage protection in his design.

The design does not use the IRFB4212PBF which is a "single" MosFET, it uses the irfi4212h-117p which is a MosFET Half Bridge containing two MosFETS. These devices have been optimized for Class D Audio, so if you change the design to use two single MosFETS, you may not get the results you expect.

L25D is single mosfet by using 2 X IRFB4020PbF.

Not too sure if it can replace it with IRFB4212PBF.