I have a 6W ceiling light with 30x 2835 LEDs in series, the driver is
externally mounted and is on the blink (flashed for a while, now mainly
nothing, occasional flicker) no bulgy looking capacitors, PCB seems to
be a reference design for a bright power BP3133A chip.
So I need a replacement CC driver that will provide 60mA @ 90V, but I
don't seem to be finding such a thing, anyone?
not touchable, but the LED strip (unusually all in series) is only
separated from the aluminium case by a strip of some tape, the LED part
is 3m distant from the driver, with just two single insulated cables for
+ and - to it, no earth available ...
The other thought is to replace the LED strip with more conventional 12V
LED strip that's cuttable every nth-LED and use a more easily obtainable
I hadn't appreciated what voltage it must have been running at until it
died and I dismantled it (30 white LEDs in series at ~3V each) no
markings on the PSU, but I notice the output smoothing cap is only 50V
rated, so probably explains why it only lasted a couple of years.
What makes you think the LEDs are a single series chain?
Often there are two or more series chains on the tape,
connected in parallel, so the driving voltage is lower
(or variations such as adjacent LEDs paired in parallel).
[email address is not usable -- followup in the newsgroup]
Well ... I thought I'd looked closely enough to see it zig-zag as a
single run (this tape has no cut marks or resistors) but looking more
closely they are in series runs of 5 LEDs, with 6 groups in parallel.
Yes, even still constant 60mA @ 15V drivers seem rare ...
I was just thinking the same. 90 v that is a little odd. Are we sure the
leds all still work and that a short somewhere in this sticky insulator is
not what has done for the psu in the firs place?
Lossless droppers using capacitors are generally only used in cases where
you cannot actually touch the cable at all, I used to have one in a pifco
torch that was rechargeable, eventually the capacitor went leaky and filled
the room with orrible smelling smoke.
This newsgroup posting comes to you directly from...
On Saturday, 21 April 2018 19:10:07 UTC+1, The Natural Philosopher wrote:
If your name isn't bodgit & scarper you need a series R to limit inrush current to a value the LEDs will survive, and to act as a fuse when/if the C shorts. You'll also want a discharge R across the C.
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