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Creating voltage source from the output of an constant current LED driver
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noddi:
Hi,

I'm wondering if it is possible to create a constant (ish) voltage source of a constant current source (i.e. a LED driver)? I'm in a situation where the expected input from the supply I'm hooking up my system to was +48V, but recently learned that it was the output of a LDU4860 (Depended on some misleading documentation). There's also a challange with the changing system load, which changes between 100mA to 200mA peak when supplied directly from a +48V lab supply.

All input and help is strongly appreciated.
dom0:
48 V Zener or a shunt regulator (e.g. TL431 with extra pass element).
magic:
What's the output current from that thing and can you take it apart for modification?
I mean, zener will work, I wanted to jokingly suggest resistor, but power dissipation may become a bit crazy if the output current is high.
ocset:
I mean really its not good to try and do it…but since you cant get inside the LDU4860, then maybe put a big cap on its output…then just  on/off switch it to keep the cap at approx. 48v…so a comparator looking at the cap voltage and feeding into the ldu4860 on/off pin…
noddi:
Thanks for all the replies!


--- Quote from: magic on November 30, 2019, 08:54:54 pm ---What's the output current from that thing and can you take it apart for modification?
--- End quote ---

It can supply 1.75A in short circuit. Can't modify the LDU circuit at all, so I think trying to go the zener diode road. I'll give an update during the week on how it plays out.
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