Tuning DC1924 and DC2009 demo boards from Linear for Buck/Boost DC/DC conversion

[jumpjack]

Linear Technologies has two interesting demo boards to manage buck/boost DC/DC conversion:
DC1924 (LT8705 based): input 36-80V, output 48V/5A
DC2009 (LT3791 based): input 12-58V, output 24V/5A

Actually LT8705 has 3-80V input and 2-80V output and can handle up to 250W
LT3791:5-60V, 2-60V, ? W

I need a buck/boost converter capable of 60V/50A output or 48V/50A output.
Could these boards be appropriately tuned for such a task?

https://www.linear.com/product/LT8705#overview
https://www.linear.com/product/LT3791-1#overview

 

[jumpjack]

No answers?
Nobody working with buck and boost converters here? :sad:

 

[mtwieg]

In principle the control IC would work okay, but you'd need much larger FETs, so that board wouldn't do it without major modifications.

For high power designs, usually it doesn't make much sense to use such specialized converter ICs, since you'll likely need external gate drivers and other circuitry anyways.

 

[jumpjack]

In principle the control IC would work okay, but you'd need much larger FETs, so that board wouldn't do it without major modifications.

For high power designs, usually it doesn't make much sense to use such specialized converter ICs, since you'll likely need external gate drivers and other circuitry anyways.

So just replacing an output mosfet by, say, 10 mosfets in parallel to carry 10X current is not feasible?

 

[BradtheRad]

The coils must also be able to carry more than 50A.

Running parallel mosfets and parallel coils gets tricky. You might rather interleave multiple buck-boost converters. Converge their outputs to your load.

 

[mtwieg]

Also the built in gate drive of those ICs won't be powerful enough to drive large (or many) FETs. Interleaving multiple phases may be feasible, if the controller allows for it.