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Led Strip(type: 5050 SMD LED) instead RF-W2SA50TS-A34 #45

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
I want to Use 5050 smd Led strip insted of RF-W2SA50TS-A34.

But I noticed that Led strip forward current is 150mA (and the RF-W2SA50TS-A34 
is only 30 mA) - see attached datasheets.

I assume that Rext resistance of MBI5026 should be changed but:
1) At page 11 of MBI5026 datasheet Resistance of the resiistor, Rext in Ohms 
shows that Iout = 90mA is the highest that I can obtain <-- Is that 90mA enough 
to light 5050 smd led strip?
2)What Rext value should I use to safely supply the 5050 smd led strip (without 
led strip or MBI5026 burn out possibility)?

Original issue reported on code.google.com by d.bankow...@gmail.com on 2 Dec 2013 at 7:59

Attachments:

GoogleCodeExporter commented 9 years ago 
I have connected Lightpack 6.0L with RGB Leds strip.
It works great. The only thing I have changed is Rext value to 375 ohm and 
thanks to it Leds shine brighter but in final version I konsider to use 
potentiometer with regulation possibility <375; 3900> ohmas.

Original comment by d.bankow...@gmail.com on 15 Jan 2014 at 10:40

GoogleCodeExporter commented 9 years ago 
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GoogleCodeExporter commented 9 years ago 
Hi,

I'm also interested in using lightpack with led strips (3x 5050 smd / 10 cm)
375 ohm seems very low, is there any calculation to figure it out?

Which led strip do you have used?

Original comment by CyrilMar...@gmail.com on 4 Feb 2014 at 6:18

GoogleCodeExporter commented 9 years ago 
just be sure drivers are not too hot

Original comment by tim.hell...@gmail.com on 4 Feb 2014 at 8:17

GoogleCodeExporter commented 9 years ago 
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GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
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GoogleCodeExporter commented 9 years ago 
375ohm gives c.a 50 mA Ioutput per channel (according the charts it is c.a 50% 
of max shown Iout and 83% of recommended max).

The Iout calculation is on the datasheet.

Today I'll check drivers operation temperature and give You a feedback.

I use simple 5050 RGB Ledstrip.

Original comment by d.bankow...@gmail.com on 5 Feb 2014 at 9:15

Attachments:

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
Ok I've didn't noticed that you didn't used the SITI DM631 Led driver.
They have different characteristics, but you help me great, I think I can deal 
with it.
Thanks!

Original comment by CyrilMar...@gmail.com on 5 Feb 2014 at 7:21

GoogleCodeExporter commented 9 years ago 
EDIT: In fact I hadn't find any DM631 or 633 in my country (France), but I find 
this: http://www.ti.com/lit/ds/symlink/tlc5927.pdf

It seems to be pretty similar to MBI5026, what do you think?

Original comment by CyrilMar...@gmail.com on 5 Feb 2014 at 7:46

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
The differences that I four are:
- output current (TLC5927 has higher)
- clock frequency TLC 30Mhz MBI 25MHz
- TLC have overtemperature protection

but in fact the replacement possibility should be confirmed by developers or in 
real application.

In plans I have 2 lightpack to soldering. I have ordered samples so If I get it 
I will test it and give feedback. :-)

Original comment by d.bankow...@gmail.com on 6 Feb 2014 at 9:50