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several lm25116

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carmusic

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i am planning to buid hi power dc dc converter but i was wondering if it is possible to use multiple dc converters in parallel to share load. I was planning using 4 lm25116 converters circuits in parallel. I need a volatge of 2 to 40V at 35A (over all the range)
if i use there simulator i am limited to about 12-15A for such designs (over that, parts with right specs didnt exist), but if i can parallel them it would be good!

Do you think it is possible?
 
I think you can get 35amps from this part. Use LARGER MOSFETs.
Pick MOSFETs with 1/3 the RDS-on. Also 1/3 with the current sense. The inductor needs to handle more current.
 
this is the problem i didnt find any inductor for so high current they would need to be custom made, remember that i need 35 amp even at 2 volt, this is very high spike current pulse
 
Coilcraft SER2915H-472 4.7uH 50amp satuation 30 amp rms
Coilcraft SER2918H-103 10uH 32A, 28A (use two in parallel)
Abracon Corporation AIRD-03-8R2K 8uH 42A (I have never used this one)
Coiltronics/Div of Cooper/Bussmann HC3-3R3-R 3.3uH 40A
Vishay/Dale IHLP6767GZER3R3M11 3.3uH 27A
PulseEngineeering P0597 5.7uH 27A,
PulseEngineeering P0598 3.9uH 34A,
PulseEngineeering PA1494.242NL 2.42uh 30A
This should get you started searching for parts.
 
Mixing high voltage and high current is a problem. Because you like national also look at LM5116,LM25116,LM5119,LM5116,LM5088.
I believe this is your first switchmode power supply so.... look at the LMZ14203 it is only 3 amps but parallel up 10 of them. Very simple!
You could parallel 10 LM2576HVs. They are very simple 60V 3A no MOSFET just add diode and coil.
 
no it isnt my first switchmode power supply and i know that making a good choice of capacitor and coil can be very hard since i need adjustable voltage at high current. Most of those siwtcher are made for fixed voltage desings. I will try paralleling several switchers together and see waht it gives. also i need the best efficiency possible since all of those parts will make a lot of heat even at 90% efficiency (at 40V 35A) (over 150W of heat!!)
 
The TLC3829 can not handle high voltage but...2-Phase and 3-Phase is a good idea at this power level. A 3-phase PWM would use 3 15A inductors. Because they runn 1/3 out of phase the output ripple is very small.
"LTC3829 - 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp."
 
Carmusic,
I have some 10.5uH@0A, 5uH@15A 6mOhm inductors PE-53700
They might work in a 3-phase PWM for you.
 
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