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Hi everybody, i need buck regulator for led drive. its input Vin=48V and Vout=3-45V DC in range and 350mA Constant Current. How can i do it ? Do you have Schematic ?
This is the way I´d go. I think it´s a valid way to go. Thus I recommended it.
There you get advice and there you get values there you get schematics. Fast, detailed, professional.
The LT3763 is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A. The average current mode controller will maintain inductor current regulation over a wide output voltage range from 0V to 55V. Output current is set by analog...
www.analog.com
..the LT3763 par example.....you have also the free LTspice sim to run it for you so you design it right first time, b4 you lay it out.
But they are a bit pricey, so for me i would do your spec with a sepic.
Analog Devices' Selection Table for Step-Down (Buck) LED Drivers lets you add, remove, and configure parameters to display; compare parts and choose the best part for your design.
www.analog.com
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Here is a nice evaluation board that meets your spec..
Demonstration circuit 1831A is a high power constant current, constant voltage synchronous buck controller featuring the LT3763. The input of the demo board is up to 60V. The output is optimized for 10V, 10A as a LED driver. The input voltage range of the LT3763 itself is 6V to 60V.The demo...
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