LED driver for 16 led's - Electronic Circuits Projects Diagrams Free

mcs51mc · 11th April 2007, 01:47 PM

I have two small black boxes 32*32*20mm with following text on it

Led driver for 16 led's
Input 230-240V/50Hz
Stable output 300mA (CC)
-20°C/80°C

I like the "Stable output" part since both drivers are dead

No more light from the led's

What do I have to put into the small BB to make the leds lit again

I did some tests on the working LED block:
Powered from a DC supply I need 3.2Vdc @ 0.3A cc to lit the led's.

Now my question is: How do I make a constant current source of 300mA / 3.2Vdc starting from 230V/50Hz without any transformer?

Thanks for any input ... ...

ericgibbs · 11th April 2007, 02:11 PM

hi,

Download the datasheet for the LM317, its got a CC application circuit to suit your requirement.

EDIT:
Powered from a DC supply I need 3.2Vdc @ 0.3A cc to lit the led's.

dch222 · 11th April 2007, 02:15 PM

No really safe or efficient way without a transformer, except an ac-dc switching supply - expensive.

mcs51mc · 11th April 2007, 06:13 PM

Hi,

Thanks for the replies but:
Concerning the LM317; maximum input voltage 40V so direct connect to mains is impossible

Those little black boxes (35*32*20mm error in first post

) comes from a lamps showed in attached file. I can assure you there's no transformer in it. So how do they do it with no heat dissipation?

on1aag · 11th April 2007, 07:24 PM

Hi mcs51mc,

You are not going to believe this but about two years ago, I bought
an entire box with prototypes from Massive at a local fleamarket for
50 cents each. The 16 leds were on a double sided pcb's with a little
black box attached to it. The pcb's had all different shapes and the
leds were in all sorts of different arrangements. I had at least 50 of
them and I sold them all at the next radio rally for 2 euro's each.

I can't remember if the leds were connected series or in parallel.
I was wondering if the leds are individually accessable ?

on1aag.

justDIY · 11th April 2007, 07:42 PM

google for "offline switcher"

also have a look at www.supertex.com, part HV9910

mcs51mc · 12th April 2007, 05:37 PM

@on1aag
Indeed PCB with 16 led's in parallel ?!?
Constant currenty supply with led's in parallel; isn't that a bad design?
How do you control the current through each led?

Did you open a driver or not? Any idea what components are involved?

I think Massive put some prototypes in production

@justDIY
Thanks for the Supertex device.
Datasheet and application note's have always led's in serie, original PCB from Massive is parallel. Did you ever use a HV9910 with led's in parallel?
I can off course make a new PCB

on1aag · 12th April 2007, 06:44 PM

Hi mcs51mc,

I have no idea what's inside the black boxes, mine all worked and
I didn't pay much attention to it at the time. And as I already
mentioned in my previous post, I've sold them all.
But if you have some defective ones, you could use extreme
violence to get one of these mysteries open.

on1aag.

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11th April 2007, 01:47 PM	(permalink (permalink))
mcs51mc	LED driver for 16 led's I have two small black boxes 323220mm with following text on it Led driver for 16 led's Input 230-240V/50Hz Stable output 300mA (CC) -20°C/80°C I like the "Stable output" part since both drivers are dead No more light from the led's What do I have to put into the small BB to make the leds lit again I did some tests on the working LED block: Powered from a DC supply I need 3.2Vdc @ 0.3A cc to lit the led's. Now my question is: How do I make a constant current source of 300mA / 3.2Vdc starting from 230V/50Hz without any transformer? Thanks for any input ... ...

11th April 2007, 02:11 PM	(permalink (permalink))
ericgibbs	hi, Download the datasheet for the LM317, its got a CC application circuit to suit your requirement. EDIT: Powered from a DC supply I need 3.2Vdc @ 0.3A cc to lit the led's. __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 11th April 2007 at 02:21 PM.

11th April 2007, 02:15 PM	(permalink (permalink))
dch222	No really safe or efficient way without a transformer, except an ac-dc switching supply - expensive.

11th April 2007, 07:24 PM	(permalink (permalink))
on1aag	Little black boxes. Hi mcs51mc, You are not going to believe this but about two years ago, I bought an entire box with prototypes from Massive at a local fleamarket for 50 cents each. The 16 leds were on a double sided pcb's with a little black box attached to it. The pcb's had all different shapes and the leds were in all sorts of different arrangements. I had at least 50 of them and I sold them all at the next radio rally for 2 euro's each. I can't remember if the leds were connected series or in parallel. I was wondering if the leds are individually accessable ? on1aag.

11th April 2007, 07:42 PM	(permalink (permalink))
justDIY	google for "offline switcher" also have a look at www.supertex.com, part HV9910 __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

12th April 2007, 05:37 PM	(permalink (permalink))
mcs51mc	@on1aag Indeed PCB with 16 led's in parallel ?!? Constant currenty supply with led's in parallel; isn't that a bad design? How do you control the current through each led? Did you open a driver or not? Any idea what components are involved? I think Massive put some prototypes in production @justDIY Thanks for the Supertex device. Datasheet and application note's have always led's in serie, original PCB from Massive is parallel. Did you ever use a HV9910 with led's in parallel? I can off course make a new PCB

12th April 2007, 06:44 PM	(permalink (permalink))
on1aag	Massive prototypes. Hi mcs51mc, I have no idea what's inside the black boxes, mine all worked and I didn't pay much attention to it at the time. And as I already mentioned in my previous post, I've sold them all. But if you have some defective ones, you could use extreme violence to get one of these mysteries open. on1aag.