This reference design provides a high efficiency power stage solution for smart thermostats and other gateway building automation end equipment using a 24 VAC power source. This power stage takes a 24-VAC input and produces a 5 V and 3.3 V output rail, which can power additional point-of-load converters if added. The design provides LiPo battery charging and seamless switching to battery power during a brownout. The boosterpack formfactor allows the designer to evaluate this power architecture with other launchpads and includes an LED driver and current sensing capabilities.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | High-Efficiency 24-VAC to 5-V, 3.3-V Ref Design With Battery Backup and Charging | PDF | HTML | Jun. 30, 2023 |
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