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LT4320 based active rectifier
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Old 12th December 2019, 06:02 PM   #551
mpa is offline mpa  United Kingdom
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Just about to stuff my CRC PCB's but I managed to order the wrong DIL socket so will have to wait for some more
A couple of quick questions from a noob though! What is the purpose of C1, C9 and R9? Are these all optional?
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Old 12th December 2019, 07:44 PM   #552
mpa is offline mpa  United Kingdom
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A couple of pics of the boards to see if everything looks ok? Minus the LT4320's as I can't mount them until I get the correct DIL sockets.
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Old 12th December 2019, 07:46 PM   #553
mpa is offline mpa  United Kingdom
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Oh, and I haven't mounted the LED's yet as I'm putting them on the front panel of the amp.
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Old 12th December 2019, 07:51 PM   #554
Rinman77 is offline Rinman77
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Quote:
Originally Posted by analog_sa View Post
No problem with the staggering but why all these snubbers? No harm done only these circuits require no snubbers.
Hi,
Could you elaborate on this? As I understood it, standard diode bridge rectification triggers ringing because of the 0.6 cutoff of the diodes--but 4320 cures that by turning on/off at 0 crossover. But are there not other triggers for ringing that could occur? I've been wondering this for a while.
I understood that the snubbers were still being recommended, and thus assumed other transients could induce the ringing--although perhaps not so frequently.
Or is there another reason you consider the snubbers unneccesary?
Ron
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Old 12th December 2019, 08:34 PM   #555
Botte is online now Botte  United States
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LT4320 based active rectifier
Quote:
Originally Posted by mpa View Post
A couple of pics of the boards to see if everything looks ok? Minus the LT4320's as I can't mount them until I get the correct DIL sockets.
\

Make sure your FET's are soldered well; that the thru hole is filled by soldier. It's a lot of current draw with the thru hole plating.

My two cents.
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Old 12th December 2019, 08:40 PM   #556
mpa is offline mpa  United Kingdom
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Thanks Botte, I always seem to have trouble getting solder to flow through double sided boards for some reason..
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Old 13th December 2019, 12:58 AM   #557
prasi is offline prasi  India
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LT4320 based active rectifier
Quote:
Originally Posted by mpa View Post
Just about to stuff my CRC PCB's but I managed to order the wrong DIL socket so will have to wait for some more
A couple of quick questions from a noob though! What is the purpose of C1, C9 and R9? Are these all optional?
Hello mpa,
nicely done.
C1 is a small electrolytic about 220uf, that would help reduce inductance. suggested by a kind member.
C9/R9 is an output snubber.


regards
Prasi
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Old 13th December 2019, 01:02 AM   #558
prasi is offline prasi  India
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LT4320 based active rectifier
SMD and THT rectifier only boards

tomtest: SMD: 10 pairs, THT 5 Pairs
wgh52: SMD 18 pairs, THT 16 pairs
randytsuch = SMD 2 pairs , THT 3 pairs
alazira: THT 6 pairs
grufti = SMD 4 pairs
Destroyer OS = SMD=4 PAIRS, THT= 4 PAIRS

Total : 38 pairs SMD , 34 pairs THT


LT4320 based CRC PSU PCBs

vvs07 = 4 nos.
randytsuch = 2 nos.
tubesguy = 2 nos.
windwardmt = 4 nos.
alazira = 2 nos
grufti = 2 nos

total 16 nos.
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Old 13th December 2019, 01:03 AM   #559
zman01 is online now zman01  Bangladesh
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LT4320 based active rectifier
Quote:
Originally Posted by mpa View Post
A couple of pics of the boards to see if everything looks ok? Minus the LT4320's as I can't mount them until I get the correct DIL sockets.
You have the DIP package part - 584-LT4320HN8-1#PBF?

Wouldn't it be possible to directly solder that through hole part onto the PCB? Or that is not advised?
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Old 13th December 2019, 01:13 AM   #560
prasi is offline prasi  India
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LT4320 based active rectifier
Quote:
Originally Posted by zman01 View Post
Regarding MOSFETs, I am looking at other options besides the CSD19535KCS listed as an example in Prasi's bill of materials.

How about STP110N8F6?

Suggestions are welcome.
Qg is quite high.
Somewhere towards the beginning of thread tvicol and myself had posted suggestions regarding suitability criteria.
low Qg, High VDs, Low Rds-on and Vgsth=2.5-4.5, etc.

please read it. Also For SMD/THT rectifier only boards i had posted sch with many options.
Also some suggestions by Danny_66
LT4320 based active rectifier
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