Thanks, i believe for virtually any position, the GaN FETs (with antiparallel Schottkys) for Synch Bucks, give a more pricey solution than Si (with antiparallel Schottkys) , but perhaps GaN is a tad more efficient.......
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****.....Also, do you know why the LM5143 (Synch Buck controller) was used for this Synch Buck spec (PMP31210 ref design)
of 20-58vin and 13.5Vout and 50A out?
Surely they should have just used the same_priced LM5119 instead?
The LM5143 has a max gate drive voltage of just 4.5V, meaning they are restricted to logic level FETs and their Rds(on)
is much higher at the 80V rating needed.
The LM5119 has a gate drive voltage up to 15V...meaning far lower Rds(on) FETs are available , and so FETs would be much cheaper.
Unfortunately we dont have an official company address, and so cant ask on the ti.com forum.
You would think they would advertise products in their suitable useage case, rather than in a totally unsuitable case?
I mean, 58Vin Synch Buck, with 700W output, and they are using a gate drive of 4.5V ??? When they could have gone with 12V gate drive for
same price solution.???
Maybe the SMPS is operated in sub zero temperature buildings and the extra heat dissipation is useful? -only plausible explanation.
PMP31210 Ref Design:
View the TI PMP31210 reference design block diagram, schematic, bill of materials (BOM), description, features and design files and start designing.
www.ti.com
LM5143:
TI’s LM5143 is a 3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ. Find parameters, ordering and quality information
www.ti.com
LM5119:
TI’s LM5119 is a 5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller. Find parameters, ordering and quality information
www.ti.com