I have 5 COB LEDs that have rating of 12V and 170mA.
I ended up buying a PSU that is rated at 15V and 3A (https://www.digikey.com/en/products/det ... ST/7704684) This means I'll need a current limiting resistor of 11 Ohms (at 2W power rating). And, I can support approximately upto 17 COB leds in parallel configuration. This has a dimension of 10cm x 5.2cm x 3.3cm
BUT, recently I came across this PSU (https://www.anker.com/products/a2669-3- ... JsQAvD_BwE). See attached specifications in this post. This PSU has a dimension of 4cm x 4cm x 5cm (significantly smaller)
Questions:
1. What exactly does it mean when the PSU can supply 5V=3A/9V=3A/etc... what does that "OR" mean? Does it automatically decide to pick one voltage and current? How does it do that?
2. What happens when the PSU voltage equals the forward voltage of the COB LED? I'll still have the current limiting resistor. But how does one create the resistance of that resistor in this scenario ?
3. What exactly will happen if I use the anker PSU to power my COP LEDs? Which of those "OR" voltages will happen?
This is confusing me a lot. Thanks in advance!
The motivation behind this question is simple. I want to save space. I'd like to pick the anker option but the questions above are stopping me from making an informed decision
I ended up buying a PSU that is rated at 15V and 3A (https://www.digikey.com/en/products/det ... ST/7704684) This means I'll need a current limiting resistor of 11 Ohms (at 2W power rating). And, I can support approximately upto 17 COB leds in parallel configuration. This has a dimension of 10cm x 5.2cm x 3.3cm
BUT, recently I came across this PSU (https://www.anker.com/products/a2669-3- ... JsQAvD_BwE). See attached specifications in this post. This PSU has a dimension of 4cm x 4cm x 5cm (significantly smaller)
Questions:
1. What exactly does it mean when the PSU can supply 5V=3A/9V=3A/etc... what does that "OR" mean? Does it automatically decide to pick one voltage and current? How does it do that?
2. What happens when the PSU voltage equals the forward voltage of the COB LED? I'll still have the current limiting resistor. But how does one create the resistance of that resistor in this scenario ?
3. What exactly will happen if I use the anker PSU to power my COP LEDs? Which of those "OR" voltages will happen?
This is confusing me a lot. Thanks in advance!
The motivation behind this question is simple. I want to save space. I'd like to pick the anker option but the questions above are stopping me from making an informed decision
Statistics: Posted by microberry — Fri Sep 06, 2024 2:32 am