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LT4320 based active rectifier

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#1,622
New transformer with proper secondary voltage would be my suggestion.
50VAC is too close for comfort for LT4320 active rectification. If your power grid is running above normal on some days you could be higher than 72VDC.
Check the LT4320 datasheet.
 
#1,630
Hi wcwc,
just follow the advice here by Tibi.
iTiberius

Post in thread 'LT4320 based active rectifier'

Few advices from someone that already made over 100 ideal bridges.

Selecting the right mosfet is a challenge. You can end with a good ideal bridge or a poor one.

You must take care on following parameters:
Mosfet Vds must be above output desired output voltage.
Id - must be at least 2,5 times higher than maximum desired current under full load
For LT4320 to operate correctly mosfet threshold Voltage must be between 2 and 3V
Very important, Rdson must be as low as possible at 10V. Best under 10mohm.
Very important, Qg Gate Charge Total at 10V as low as possible. LT4320 is not able to...
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its borderline case as far as voltage is concerned especially with mains fluctuations and transformer no load output being higher.
 
#1,631
For a preamp with 2x18VAC transformer and roughly 10mF of total capacitance in a CRC PSU, I've come up with IPA400N06N after a Mouser seach.
-Vds 60V, RDS(on) 4mOHM, ID 69A and Qg is 37nc at 10V..
Some specs seams overkill like ID at 69A, so do anyone know if there is a through-hole MOSFET that's better suited or will these do OK??
Thanks
 

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