LT4320 based active rectifier

[triode_al]

This e-bridge needs a separate winding for each polarity, so you need four output wires. No center tap. And two bridges of course.

 

[prasi]

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

Hello nautibuoy, 5 amps is not a problem with low Rdson mosfet with smd packages.
Eg. 5mohm and 5 amps is 125 mW. So you can use safely , no problems. Pcb has good copper area , so even 10mohm Rdson should not be problem.

 

[nautibuoy]

Thanks prasi. I already have some BSC039N06NSATMA1 devices, which have an Rdson of 3.9mOhm so looking good to go.

Incidentally, do you have any more of the smd version PCBs available?

 

[triode_al]

Stupid question: some power mosfets (many..) have a reverse diode.
It seems that it has to do with the substrate so sometimes inherent in the design.

Should that type be avoided?

 

[prasi]

Thanks prasi. I already have some BSC039N06NSATMA1 devices, which have an Rdson of 3.9mOhm so looking good to go.

Incidentally, do you have any more of the smd version PCBs available?

very nice mosfets indeed with desirable characteristics.
yes, I do have plenty of smd LT4320 rectifier pcb left in my stock.
let me know qty you require. I will use earlier credentials to send PP invoice.
regards
prasi

 

[nautibuoy]

Thanks prasi. What will another four PCBs cost me?

 

[prasi]

hi nautibuoy, the price is 2 usd a pair ( to make v+/0/ v-). 4 pairs including shipping/paypal will cost 13-14 usd approx.

 

[nautibuoy]

In for a penny...

Some spares will be handy prasi, thank you - can you send me a PayPal invoice for the four pairs please.

 

[DaveFred]

I have not seen many (any?) of Prasi's finished "COMPACT CRC PSU-FOR EITHER DUAL SECONDARY OR CENTER TAPPED TRANSFORMERS".

Here is how one I am building sits before soldering in of the rectifiers (PB3508-E3/45) or main caps (380LX103M050A022).

This is being paired with a 300va dual 24v toroidal transformer for "Xmas Amp - Dibya's TDA7293 by Jhofland".

Snubbers were arrived at with Quasimodo jig.

The radiators Prasi recommended (ATS-PCB1061) for the rectifiers needed some modification to "fit" and are most likely overkill.

How does it look before I wrap it up?

(I added all the ground lugs because I am going to use one for the ground loop protection circuit and one for a speaker protection circuit fed off the main PSU)











Thank you,

David.

 

[prasi]

Perfect build David. Even I have built one and using in an amp. Just , no photos

 

[iTiberius]

Stupid question: some power mosfets (many..) have a reverse diode.
It seems that it has to do with the substrate so sometimes inherent in the design.

Should that type be avoided?

Substrate diodes are very important part of the design. These are used at very start-up.
At very first power on, substrat diodes will charge output capacitor and LT4320 internal regulator will start to provide internal chip voltages.
Also, substrat mosfet diodes will and must cope with in rush current. If you use 10.000uF after synchronous rectifier, make sure that your mosfet substrat diode will be able to sustain min.10A for a short time. This information is provided in mosfet datasheet.

Regards,
Tibi

 

[analog_sa]

I want to also use it in a 2SK180 project, having 65 V AC

65v AC? Really?

 

[Frederico Acardi]

Hello, what is the easiest chip to use to convert this design into a 60Hz 300VAC 1A bridge rectifier ? No need for center tap support. Thank you.

 

[prasi]

Hello Fredrico, You can visit tvicol GB thread. He has some designs working for your voltages.

 

[Frederico Acardi]

Thank you. Does this mean that this design cannot be converted easily ?

 

[prasi]

Hello all,
I am all out of LT4320 CRC PSU PCBs.
I plan to get manufactured it in 1.6 mm thickness (2.4mm no longer an option).
this order will be to take care of intermittent requirements that I keep getting.
if anyone is interested , please add your diya name and qty in the form of a list here below. once the pcb are ready, I will contact by PM.

regards
prasi

 

[zman01]

Prasi,

Would you please post an image of the latest design of the PCB?

 

[prasi]

its the same pcb for the lt4320 crc psu, I didn't change anything.

LT4320 based active rectifier

 

[nautibuoy]

I made up six of the smd boards today - just one or two minor hiccoughs when I accidentally knocked some parts off their pads with the hot air nozzle but all tested out OK. Four will be used in my SissySIT build and two for an ACA project.

 

[jonboylaw]

List for next board build

Below are those interested in buying the next build of LT4320 rectifier boards:
Copy, add your name and re-paste


1) jonboylaw