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DIY DC-DC LED (remote) drivers
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John B:
I'm looking to design my own DC-DC LED drivers. While there's a million off the shelf items that do a basic job, there's a few things that make it worth trying myself. Namely, I'm aiming for low noise (as much HF noise filtered out as possible) and low ripple (as close to DC as possible), true analogue dimming, plus a few extra features like an interface for controlling the analogue dimming level. Input and output voltages are expected around 60V, with output currents generally around 250mA. Also the drivers would be remote mounted, with up to perhaps 15m of wire going from the driver to the LED strings. Since they're for personal use, space, size and the cost of parts aren't a concern. I am imagining large inductances and capacitance to filter the output.
https://www.ti.com/product/TPS92640
https://www.ti.com/lit/ds/symlink/tps92640.pdf
One part I've found is the TI TPS92640 synchronous buck controller chip. Seems to tick all the boxes, but the designs in the datasheet seems to focus around either minimal or no capacitance on the output, plus targeting a certain amount of ripple through the LEDs. Also no mention of mounting the drivers away from the LEDs, but it does mention that the control scheme is forgiving and shouldn't require compensation.
Is there some trap that I am missing my approach? Or perhaps it is just a non-economically viable, complicated way of hooking lights up, and so it's not catered for in designs.
I'm aware of a few other related issues, such as a colour change in LEDs when run at lower DC Vf, versus a higher Vf, but run at a lower duty cycle. However, with the light setups I have at the moment, I don't think it's an issue.
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