LT4320 based active rectifier

[ghitus]

Guys, hi again! Must the mosfets of this rectifier be matched in any way?

Thank you.

 

[beardman]

Hi Prasi
got my board today,,i have mounted them with component,,and they play now in my power amp

very fine board you make

Best Bjarne

 

[prasi]

Hi Bjarne,
Thats nice to you already got the boards, built and started using it. very quick.
regards
prasi

 

[Dan K]

Hello all, are people building their TH rectifiers with the SMT snubber implemented? Has anyone tested if the MOSFET is actually able to make a transformer ring?
Thanks

 

[prasi]

Hello all,
I still have plenty of pairs of THT and SMD rectifier pcbs.
I have run out of LT4320 + CRC PSU PCB. If there is still some requirement , I can place an order for 1 more batch.

regards
prasi

PS To, Dan K, Best is try without snubbers. I think you will notice a definite improvement over conventional rectifier PSU

 

[prasi]

Well received and Thanks prasi.
Time to source components for building.

this OLFA mat seems to be very popular. unfortunately in India there are knockoffs that aren't self healing.

 

[jimk04]

Reading back through this thread and having built one THT rectifier up it is working fine in my class d power amp. But I've just realised I didn't populate the 2 capacitors.! Still works.
What is happening exactly just out of interest.....without these. I shall solder them in ASAP.

 

[jean-paul]

Possibly misfiring the MOSFETs I guess. In most cases the bulk filter cap is nearby but I would solder them in ASAP.

 

[Dan K]

Hello all, Can someone please direct me to the post where it's explained why one of these rectifiers can't be used by itself to supply a power amp from a single transformer secondary? I've got a single centre tapped traffo and I was hoping to use one of these with the centre tap blanked off. I've not had much luck when using STP130N8F7's. The amp powers up and bias's correctly but as soon as any load is applied the negative rail voltage drops to zero and the associated Mosfets go open. Thanks.

The amp is a Bedini 25/25. 35Vac across the traffo outputs and +/- 21V at the rails.

 

[ItsAllInMyHead]

Hi Prasi -

Once again, thank you!

I am getting ready to assemble my boards. I know it is a pain to rearrange things, and this may have been mentioned before without me noticing.

In what I think is the latest revision to your THT boards, you've re-routed the traces for Q4, which does not correspond to the excellent renderings in post #765. Thus, Q4's alignment now "matches" Q2. I saw this immediately on the boards b/c they note the proper orientation on the silkscreen, and I checked with a DMM. However, this may trip up some builders.

If it is of limited trouble, could I suggest that post #1 be updated to point to a current rendering. Again, I know this might seem silly, but it may help out another builder.



Patrick

 

[prasi]

Hi Patrick,
Good point. It was my laziness and rendering takes long time (I had an old i3 laptop, slower than snail then) . So didnt do latest rendering.
I am attaching here correct renders for THT rectifier version.

regards
prasi

 

[nattawa]

Hello all, Can someone please direct me to the post where it's explained why one of these rectifiers can't be used by itself to supply a power amp from a single transformer secondary?

In This Post I tried to explain what I found to be why it doesn't work with center tapped secondary in constructing a split rail PSU.....it is because the bottom MOSFETs stay conductive most all the time during the AC cycle instead of turning on/off in sync with the top MOSFETs. I attempted a circuit trying to make it to work but it seems too much complexity would have to be involved in order to get it work properly under all possible conditions.

 

[ItsAllInMyHead]

Hi Patrick,
I am attaching here correct renders for THT rectifier version.
regards
prasi

Hi Prasi -

You are very humble. I truly appreciate all the time and support you provide. It makes DIY projects much more approachable for beginners like myself.

With thanks!
Patrick

 

[triode_al]

This looks pretty good!!
Is there a group buy right now on the discrete version? (I have T0-220 N-Mosfets)?

 

[prasi]

Hi Triode,
yes I have the THT version of lt4320 rectifier as shown in post 1071. All documentation in post # 1 of thread.
let me know qty and paypal email address by PM and i will send an paypal invoice

regards
prasi

 

[triode_al]

Hello andoa76, PCB is not designed to handle tube voltages. Chip is capable of upto 70VDC / 50VAC .

I can use it in a lower voltage 25V AC L'Amp, of course.
I want to also use it in a 2SK180 project, having 65 V AC, so that is a no-go then . Are there any changes that can be made to accomodate higher input??

 

[nautibuoy]

Tibi may be able to help with higher voltage solution

3rd group buy for Synchronous Bridge aka Ideal Bridge

 

[nautibuoy]

All documentation in post # 1 of thread.

Hi prasi. Can you remind me what current the smd version is good for? I'm planning to use them for a class A amp project but that'll pull less than 5A so, IIRC, not a problem.

Thanks

 

[triode_al]

Tibi may be able to help with higher voltage solution

3rd group buy for Synchronous Bridge aka Ideal Bridge

Thanks for the link, the Saligny Bridge They are expensive. .
I have transformers with a 65 / 70 V secondary for 65-75V DC.

 

[hanair]

Does this work with center tapped transformers (say 18-0-18V), or do we need two separate winding for this to create symmetric power supply?

Bridges are getting super hot (upwards of 75C) in my Aleph J build, and I need to figure out a way to lower the temperature inside the chassis!