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LT4320 based active rectifier
LT4320 based active rectifier
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Old 12th April 2019, 09:08 PM   #1
prasi is offline prasi  India
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LT4320 based active rectifier
Default LT4320 based active rectifier

hello folks,
here is something i have been working on for some time.
I am willing to offer the pcbs as a group guy.
let me know if there is interest.
I will share a bom to GB subscribers, all mouser based, if GB goes ahead.
regards
Prasi

Edit 1: Group buy closed for THT PCBs, but still open for SMD PCBs. More info in the below link.
Group Buy List
group list qty_new - Google Sheets

Edit 2: Revision in prices. (price drop!)
LT4320 based active rectifier

Edit 3: GB closed for SMD PCBs. Only last 10 pairs of THT pcbs remain.

THT BOM BY MERLIN EL MAGOO LT4320 based active rectifier

EDIT 4: New GB for LT4320 based CRC PSU PCB Started..PCB's Produced and being shipped..
1. The Design: LT4320 based active rectifier
2. The PCB design: LT4320 based active rectifier
3. Physical PCB's: LT4320 based active rectifier
4. The BoM : LT4320 based active rectifier
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File Type: png LT4320-NEW.png (6.4 KB, 2411 views)
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Last edited by prasi; 26th November 2019 at 12:57 PM.
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Old 13th April 2019, 06:33 AM   #2
av-trouvaille is offline av-trouvaille  Netherlands
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Hi Prasi,

Some questions, if allowed:
- Can you please elaborate on why this is interesting?
- Can it replace an existing rectifier bridge?
- How difficult is it to solder?
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Old 13th April 2019, 03:16 PM   #3
prasi is offline prasi  India
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LT4320 based active rectifier
1. minimal power dissipation, no heatsink for rectifier, higher DC voltage output for a given AC voltage, etc

2. yes, it is a drop in replacement for SIP-4 type rectifiers.

3. THT option for LT4320 provided, MOSFETs are SMD, but will be simple to solder for anyone who has soldered SMD's before.

regards
Prasi
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Old 13th April 2019, 03:36 PM   #4
xrk971 is offline xrk971  United States
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LT4320 based active rectifier
I think more info on this is available here before it spun off onto its own thread. This version uses a double-die MOSFET. I can attest that this topology works very well - almost no heat, added headroom due to no voltage drop across silicon diodes, smooth switching with no noise spikes since phase is timed with zero crossing:

GB: CRCRC PSU

Click the image to open in full size.

Click the image to open in full size.

I am using this type of rectifier in the SLB PSU because of these advantages.

Nice little rectifier you are planning to make here, Prasi.
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Last edited by xrk971; 13th April 2019 at 03:41 PM.
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Old 13th April 2019, 09:21 PM   #5
prasi is offline prasi  India
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LT4320 based active rectifier
thanks x, yes, there will be some improvements for sure from tester ones, still working on them.

need to find some time.
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Old 13th April 2019, 10:45 PM   #6
gary s is online now gary s  Australia
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Hi prasi, do you think there would be more demand for your PCB if you made it using through hole components rather than SMT devices.

I assume you are trying to make it as small as possible.
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Old 13th April 2019, 11:09 PM   #7
xrk971 is offline xrk971  United States
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LT4320 based active rectifier
EYou could use 4 x TO220 MOSFETs with no heatsink. The LT4320 is already TH as an option. Just add a spot for 1uF ceramic x7r radial cap.

The SMT keeps package about same size as the monolithic bridges.
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Last edited by xrk971; 13th April 2019 at 11:12 PM.
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Old 21st April 2019, 02:04 AM   #8
Lo_Tse is offline Lo_Tse  Canada
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Subscribed. Would like to try this out. I wish the 4320 controller chip is cheaper though

Regards,
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Old 21st April 2019, 12:19 PM   #9
nautibuoy is offline nautibuoy  United Kingdom
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Interesting
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Old 21st April 2019, 06:18 PM   #10
prasi is offline prasi  India
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LT4320 based active rectifier
Quote:
Originally Posted by gary s View Post
Hi prasi, do you think there would be more demand for your PCB if you made it using through hole components rather than SMT devices.

I assume you are trying to make it as small as possible.
Hello Gary, let me try it with dual secondary , 2 of the LT , and 8 of the mosfets but it wont be a compact replacement for SIP-4 rectifiers; rather it will be a regular PCB that needs mounting holes, run wires to bulk cap PCB, etc.

regards
Prasi
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