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Topic: 48v to 12v dc converter (Read 316 times) previous topic - next topic

MarkT

I can imagine linear regulators built into a strip, not DC-DC converters.
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wvmarle

From the Chinglish datasheet of the WS2812b:

Quote
Also include a precision internal oscillator and a 12V voltage programmable constant current control part, effectively ensuring the pixel point light color height consistent.
This sounds like a constant current supply AND a boost converter (supply voltage is 5V, here they appear to say the constant current supply runs at 12V) built into each LED?!
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MarkT

#17
Sep 11, 2019, 07:00 pm Last Edit: Sep 11, 2019, 07:01 pm by MarkT
Quote
Also include a precision internal oscillator and a 12V voltage programmable constant current control part, effectively ensuring the pixel point light color height consistent.
I think that means each chip has an undocumented program option to correct for LED variations - this 12V is definitely not in normal use, I expect this is done once on manufacture - they are just boasting that they get better consistency of brightness than the LED dies they incorporate into the thing.
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Qdeathstar

#18
Sep 11, 2019, 08:23 pm Last Edit: Sep 11, 2019, 08:24 pm by Qdeathstar
@markT I am not sure what it had exactly but a linear regulator to drop from 12v to 5v at high current seems unlikely. (To work).. I think they had one every meter and the strip was about twice has wide...
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glares at a tickless watch.

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