MY DESIGN L20D IRS2092+IRFI4020H 200W8R

[cwier60]

Originally Posted by alkasar

We dont read the same bom I read page 33 of IRF ref design. D3, D5, D6 are supposed to be mur120.

To clarify, the IRAUDAMP7D BOM shows 1N4003 for D5-6, whereas the IRAUDAMP7S BOM that you provide the link for shows MUR120. It's probably a moot point now.

[ljm_ljm]

Originally Posted by alkasar

yes that's missing. I started the job. Did not yet identify them all.
The parts ref are those from the IRAUDAMP7S reference design, page 30. It's a L25D board picture.


it's a preview of work in progress and there might be errors at this stage. I just found one

A question at this stage :
The reference design BOM recomends ultra-fast switching diodes for D3, D5, D6.
The kit comes with 1N4007 which are not known to be ultra-fast.
Is this something to worry about ?

You can be assured.Component configuration of the tube model UF4004, VISHAY, or MIC.
Parameters, it is the recovery time is 35NS. And MUR120 are the same.

Otherwise stated 22UF capacitor, they work within the regulator DC15V.
Pressure values ​​of more than 25V fully meet the need. Higher withstand voltage of the capacitor in order to reduce the capacitor the ESR.

[noah katz]

Originally Posted by ljm_ljm

Higher withstand voltage of the capacitor in order to reduce the capacitor the ESR.

That's interesting; are you sure about that?

I would have thought the opposite, because if you make a 50 V cap from two 25 V caps by connecting them in series, the ESR is doubled.

I don't know exactly how they make higher voltage caps, but one way would be with thicker dielectric material, and that would increase ESR.

[ljm_ljm]

Originally Posted by noah katz

That's interesting; are you sure about that?

I would have thought the opposite, because if you make a 50 V cap from two 25 V caps by connecting them in series, the ESR is doubled.

I don't know exactly how they make higher voltage caps, but one way would be with thicker dielectric material, and that would increase ESR.

Capacitor of the same capacity. The greater the pressure, the greater the volume.

Height is inversely proportional to the ESR and capacitance when the capacitor height is higher, the internal anode aluminum anode paper, the greater the electrolyte area.
The smaller the impedance.

[noah katz]

I see, thanks.

[alkasar]

thanks ljm.


the picture you copied above is the work in progress version. I wish I could edit the posts and remove it to avoid confusion!

The final and correct one is here : L25D board with parts cross reference


@cwier60 :

[ljm_ljm]

Originally Posted by alkasar

thanks ljm.


the picture you copied above is the work in progress version. I wish I could edit the posts and remove it to avoid confusion!

The final and correct one is here : L25D board with parts cross reference


@cwier60 :

I hope you can smoothly

[solviken]

So is there anyway to BRIDGE two L25D modules? and what would the power rating be?

[MrSlim]

Originally Posted by solviken

So is there anyway to BRIDGE two L25D modules? and what would the power rating be?

Bridging is "not supported" on the L20D equivalent in the reference design document(links to it are elsewhere on this thread or on the L15D thread), and the L25D is even higher power than it (a variant not discussed in the Ref Doc).

I'm not sure what would happen, but if the components are not capable of handling the load, it would probably end unhappily....

The L15D on the other hand should support bridging (500W@8ohms). The Reference Doc provides a bridging circuit..

[solviken]

Thanks for answer But if i Bridge L15 would it be stable in 4 and 2 ohm? Was thinkin of using it as subwoofer amp!