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Constant current boost converter
https://www.digikey.ca/product-detail/en/texas-instruments/TPS61165DBVR/296-27597-1-ND/2340765
Heat sink (candidates):https://www.digikey.com/product-detail/en/wakefield-vette/LTN20069/345-1101-ND/1644633 - No information on heat dissipation without forced airflow. Cheap.:
Calculations:
maximum temperature of Rev3 Lights PCB = 50 C
ambient temperature (generous estimate) = 35 C
power dissipation = 2.2V * 6 LEDs * 0.35 A = 4.62 W
Required thermal resistance = (50-35)/4.62 = 3.24 C/W
https://www.digikey.com/product-detail/en/ohmite/PVPA-T2X-38E/PVPA-T2X-38E-ND/9607315/9607314 (two for each LED board will result in an equivalent thermal resistance of <4 C/W)
https://www.digikey.com/product-detail/en/assmann-wsw-components/V5619A/AE10812-ND/3511388 - Size is more appropriate compared to other heat sinks.aavid-thermal-division-of-boyd-corporation/504222B00000G/HS104-2-ND/5833
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Design
Optimizing PCB thermal performance:
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