You're right - I don't like your answer! But that doesn't mean I completely disagree with it
See if I can get explicit confirmation from them...
Tim
If using analogue dimming, is the output current varied proportionally or is it still at the rated output of the driver and the service interval varied? In other words if using the LDD-L 1500 at 50% analogue dimming signal input, would the output be a constant 750mA (within tolerances) or would it be 1500mA but only on for 50% of the time (similar to how the LDD-L would behave with PWM dimming signal).
Usually analog dimming just convert analog level to PWM signal.No reply yet:
Tim
Usually analog dimming just convert analog level to PWM signal.
I don't - i don't know enough about circuit design to assume anything like that! But i do assume that what is fairly clearly suggested (not implicitly stated) in a data sheet and then confirmed by the company to be true, is!People assume input "waveform" is equal to output waveform..
RCD-24-1.00/PL/A-R has 2 inputsThat has been my assumption based on the driver circuitry..
People assume input "waveform" is equal to output waveform..
In the case of switching constant current drivers I don't think it applies..
Especially where the different types of dimming (analog/PWM) are on the same pin (circuit).
I could see a separate circuit that would change the r sense resistor value, cutting down the constant current value.
Output will still be "pulsed" but w/ a lower peak value..
I don't see the Meanwells being designed this way though..
I have asked for clarification over the comment in the spec (which was posted as an image in his reply) about the output changing to PWM if the input is PWM but have still had no response to thatDear Mr. Tim
Refer to spec., output will be PWM type.
Tony Hsieh 謝正堂
Techinical Service Engineer 技服工程師
MEAN WELL ENTERPRISES CO., LTD. 明緯企業股份有限公司
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So in response to my earlier question to Meanwell, I got a very simple response:
I have asked for clarification over the comment in the spec (which was posted as an image in his reply) about the output changing to PWM if the input is PWM but have still had no response to that
Tim
I have removed his phone number and email as I did not ask for permission to put them on a forum
Hmm.. Pretty worthlesss response
(Theirs not yours)..........
I have a scope and would happily connect up an LDD to test. If all mine weren't LDD-H which are definitely PWM output...
And yeah, fairly worthless response!
Tim
Why couldn't they just call the graph an "Analog characteristic reference curve" and then state that output is PWM in both input methods?I think it's time to build myself a scope and connect one of these new LDD's up to find out for myself. Krazie :jester:
Much appreciated..
. The only way to "truly" run lower current on the LDD's is to use a lower value output LDD. This is true for the Ls and the Hs.