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LT4320 based active rectifier

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#1,182
Hi all,

Does anyone know where I can buy any Infineon BSC039N06NS SMT Mosfets? Looks like they are on backorder everywhere in the UK.

Also, I've discovered that you can mount the SMT boards directly on the capacitor pins!

Use a small amount of cap leg bending on a 'snap in' capacitor, seems to be a very neat solution.
 
#1,185
I've got 4 boards with LT4320'S, 47uF SMT 16V local caps and the resistors for the LED. One of them has been fully built and tested and the other 3 need Mosfets (which are not in stock anywhere) the built board is only good to 15V with the cap, or up to 40V without. PM if interested
 
#1,190
DaveFred said:
Which would be a better THT Mosfet for 50VAC or 70VDC,

CSD19531KCS

or

CSD19503KCS

?

I am thinking the first one is the better one, or any other suggestions?
Click to expand...

I would like to use the first one, CSD19531KCS, as it is rated for 100v, but neither Mouser to Digikey have them in stock.

Ti has the CSD19503KCS in stock, but it is rated for 80v, would that still be fine for 50VAC on the LT4320 rectified to 70vDC?
 
#1,191
DaveFred said:
I would like to use the first one, CSD19531KCS, as it is rated for 100v, but neither Mouser to Digikey have them in stock.

Ti has the CSD19503KCS in stock, but it is rated for 80v, would that still be fine for 50VAC on the LT4320 rectified to 70vDC?
Click to expand...
80V ratings is greater with a good margin than what LT4320 is rated for its absolute maximum at 72V, so I guess the question should be the LT4320 is suited for use with 50VAC supply or not. Apparently, LT4320 will much more likely be dead sooner than do the MOSFETs 🙂, if u-no-wut ever happens.

I'd be careful about what that 50VAC really means. Mains supply can have 10% fluctuation, power transformers usually have a load regulation anywhere from 3%-10%, which means its out put voltage at light or no load is higher than would be at its rated load.

However, if that 50VAC is the maximum possible voltage the LT4320 ever can see, it should be ok.
 
#1,192
See Below
Screen Shot 2022-08-03 at 7.37.17 AM.png
Screen Shot 2022-08-03 at 7.38.26 AM.png
 
#1,197
Xtofer said:
Hello, I’ve purchased TK34E10N1,S1X for a VSQC amp build. Planning on using 2 x transformers in dual mono setup with either 30vAC or 35vAC dual secondaries. Would these Mosfets be OK for the job?
Click to expand...
hi, those mosfets are ok, albeit have a slightly higher Rdson. just monitor the temperature of mosfet in your intended application,. if they dont heat up too much, you are good to go. rest of the mosfet parameters are good for lt4320 rectifier
 
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