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Is the Shark buck's dimming designed as a PWM dimming ?
Thanks Wayne. The reason the PWM used for dimming concerns me is that many video cameras have experienced "banding" issues when used with PWM led light units by several led light manufacturers. This banding is horizontal lines that are apparent on the video when the fps (frames per second) or shutter speed is set to 50fps or higher for slow motion capture. It is not apparent at the 29.97 fps standard speed mode though. As long as the dimming is non PWM, there is no banding problem. Also to mention is that several videographers have experienced a high pitched frequency sound that is recorded and picked up by the camera's microphone that is in close proximity to the PWM dimmed led light.Whether this high pitched frequency sound emanates from the driver due to the PWM design or to other electronics in the driver is a mystery.I have never experienced this banding or high pitched sound with your drivers as the dimming is done with an analog pot (20K log.) I am happy that the Shark Buck used with an analog pot for dimming does not have those issues.
Hi Wayne,
I was wondering if it would be possible to have a Shark Buck made to deliver 3.5A? I plan on driving an XM-L with 2xLiIon in a 2C Mag Body. I know you say that 4A is really not advisable still I'd really like to push this installation.
Wilkey
Wayne, I have a question. The copper C that is under the Shark, I imagine it is there for reason of heat. I always use arctic silver 2 part adhesive to pot the Shark to my heatsink. I use a lot of it because of the thickness of the copper C. I put the adhesive on the entire under area of the shark. If the copper C is eliminated I can use a lot less of the adhesive but will it compromise the heat or will it be ok ?
Thanks, Wayne. Looks like we're going to go with the 3A max on a single board because of space limitations. If well sinked, do you think it would run for 10 minutes without triggering thermal shutdown?I can not advise that. The IC internal switch limit is min 3A, Typ 4A, max 5A. Also, the heat of the IC, inductor and diode are already pushing the boards limitation. Even if the IC internal switch was 4A I am pretty certain it will thermally limit out in less than a minute.
If you want 4A you can use two in parallel each set for 2A to get the 4A configuration
Wayne