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DC-DC / PSU for up to 60V input, 5V output @ ~2-3 Amps
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WanaGo:
Hi,
Just wondering if anyone has any ideas for a switchmode or suitable DC-DC, for dropping 24V or 48V batteries down to a 5V level, with about 2-3 Amp capacity.
Its for a battery monitoring system.
Just trying to find suitable parts, ideally SMD/SMT parts to mount onto a PCB.
Not really wanting a module which has to sit off a PCB, prefer like a little Switching DC-DC or something.
So far havent really managed to find much.
Any switcher IC's I have found have sort of been up to 1A max, and can do about 36V input, nothing really over that.
I have found some little modules, like a little PCB with multiple components, but they are $10+ each.
I am not necessarily looking for a 1 part solution, an IC with inductor and passives etc is what I had in mind, its just trying to find a suitable part to start with I have no had much luck with as of yet.
Anyone have any ideas?
I have found these:
https://www.digikey.com/products/en?dc=81646
https://www.digikey.com/product-detail/en/murata-power-solutions-inc/OKI-78SR-5-1.5-W36HE-C/811-3289-ND/6817694
I could use 2 of these at a push if I had to...
But ideally wanting something like this, but with higher output amperage capacity.
https://www.digikey.com/product-detail/en/linear-technology-analog-devices/LT1933ES6-TRPBF/LT1933ES6-TRPBFTR-ND/959504
Any help would be appreciated
Thanks
angust_uk:
I've used the LM5005 from TI in a past project where we needed a wide input range - https://www.digikey.co.uk/product-detail/en/texas-instruments/LM5005MHX-NOPB/LM5005MHX-NOPBCT-ND/3526995
Worked well for me, and on brief inspection seems to meet the criteria
angust_uk:
--- Quote from: blueskull on January 16, 2020, 03:21:48 pm ---
--- Quote from: angust_uk on January 16, 2020, 11:50:03 am ---I've used the LM5005 from TI in a past project where we needed a wide input range - https://www.digikey.co.uk/product-detail/en/texas-instruments/LM5005MHX-NOPB/LM5005MHX-NOPBCT-ND/3526995
Worked well for me, and on brief inspection seems to meet the criteria
--- End quote ---
The minimum guaranteed limiting current is only 3A, which means for it to output 3A, it has to operate in CCM with very low ripple, which means you need a huge inductor.
Even for it to output 2.5A, you need a 33uH inductor (factoring in tolerance and inductance drop).
--- End quote ---
That's exactly what I used:
WanaGo:
Thank you everyone, this is great stuff.
We had considered a transformer, but that is not ideally really, but it is something we thought we might have to go with...
But this LM5005
That looks great. I don't know why that never came up in searches I had done on Digikey.
Many thanks, I am going to look into this now.
2.5A could be plenty. 2A likely will be enough for what we can work with.
Thanks very much
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