I have a spec for wide range input 8V~14V->12V/80A
Can LT8390 achieve parallel function ?
I would like use a master and 3 slave parallel.
Is there any reference design or schematic for this?
Please kindly share with me.
Thanks a lot.
Please use the article below as reference:
Some highlight that could be taken…
Some highlight that could be taken on the article is to tie the IMON pin on the master to the slave CTRL.
another is CLKs of the converters should be offset to each other
I read article and have some questions...Article provide only short description (January 2017 : LT Journal of Analog Innovation, page 8)
" A final optimization of the combined system’s loop response resulted in a stable parallel system capable of delivering 600W of output power at the same operating temperature as a single 300W LT8390 voltage regulator."
Master and slave have a different compensation and sense filter components...
Could you explain me please, why and how components was optimized?I would be grateful for any information (app. notes., ref. design`s, books, etc.)
-- With best regards,
The master and slave have different compensation because they are operating a different modes. Master is operating at CV mode and the slave is operating in CC mode.
Optimization of the compensation and the sense filter were done on bench by measuring the gain and phase margins of the converters. Making sure that the bandwidth of the master is greater than the slave
Thank you Mikee!
"Making sure that the bandwidth of the master is greater than the slave "
Any general recommendations? 10%, 20% greater?
There is no definite margin for this one as it will vary per application of the power supply.
Maybe 10% is a good start then test your system if it would be stable with the given margin
Thank you for information!
Any idea how this can be modeled with LTSpice? Any examples available?
There are some approaches for modelling stability (open-loop gain and phase response) for OpAmp`s...But currently I can not understand how to apply such technique for Master-Slave DC/DC...
-- With Best Regards,