Don’t want to trust others experience without proof - eh?
To find specs you have to know the maker and find his specs sheets which I can’t.
But look at the V2 driver 3.04A at Kaidomain. You can’t see anything from the pictures but the 7135’s are marked “38K” the same way as yours “38P” (I have one in my hand right now). This is a common way to mark the bin and the letter is not relevant, but often a package code.
If you don’t trust me now that you have a 3.04A driver then it is your loss.
I do tend to trust datasheets more than random Internet postings (I do not know your level of experience). But I can see the one on FastTechs website is marked 35F, this does kill my date guess.
It is not really a loss for me, just some other numbers in my test. The "low" current version has the advantage that it runs slightly less hot, with many drivers close together it might allow it to run longer at full brightness.
I agree with HKJ, no one is saying your out to spread misinformation, but it does happen, there are many posts by people who did not understand something correctly and explained it to a new member with mistakes, or people who came up with wrong conclusions based on many factors, with no malicious intent or occasionally with intent.
When you have built a reputation as a respected member and a reliable source of information then people are more likely to take you at face value (there are many members who people trust for technical advice, including HKJ), but the adage trust but verify does also come in handy, and a datasheet is something that a company is using to drum up business so they are generally used as a source of verified information.
Correct, I have not rejected his specification, I would just like to see some documentation for it. In my first post about the AMC7135 I did link to the datasheet from ADD, where it specifies the A for low current version.
ADD might have changed the way they mark the chips (Datasheet is from 2006) or the 7135 might be from another manufacturer.
When I start to test all the drivers from intl-outdoor, I might be able to see what is correct (If some of the uses the low current driver).
Types:
Buck: Driver uses an inductor to decrease the voltage, input current is less than output current.
Boost: Driver uses an inductor to increase the voltage, input current is larger than output current.
Linear: Driver uses a linear chip (like 7135) to reduce the voltage, input current is the same as output current*.
Direct: No current regulation (except resistance) is present, input current is the same as output current*.
All driver types can use pwm for brightness regulation, the first 3 can also use linear regulation.
*Except for current for the control circuit.
It is possible to copy the table to a spreadsheet and sort on different columns.
Any comments?
Great work, very interesting, thank you. Is there a way to monitor the driver temperature during testing? I would be interested to see what performance drop there would be due to high temps, also the performance gains when heatsinked well. Or maybe point out which drivers are more temperature sensitive than others.
Now I am just waiting for the drivers to arrive, the led test modules are ready:
The wires and current test resistor adds about 11mOhm resistance, i.e. at 3A I will have an error of 0.033 volt. I expect there are more variations between leds than that.
Oohh. and please publish the KK 4200 battery review before you get your hands full with all these drivers. Im into buying some cells sooner than I though. Would be nice to see a review before I pull the trigger!
BTW, really looking forward to see these driver circuit reviews! So in advance, thank you for doing them! :)
Btw, what kind of emitters will you be testing them with?
Test the 3-18V driver. Its got very slow mode change. You will probably notice it out.. With a normally fast 5 mode, you could get to the mode you wanted way faster, and without any pause. I just remember the driver as being very slow. I don't have it any longer. Not that tempted to buy it either due to the slowness and PWM whine.