This reference design provides a low BOM count, high-efficiency power stage for smart thermostats and other gateway building automation designs. This power stage takes a 24-V AC 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 24-V AC brownout. The power-path capability provides battery power assistance allowing load transient to exceed the current limit of the 24-V AC to DC system, allowing a lower cost wide-Vin buck to be used. The battery fuel gauge helps designers preserve battery life and ensure proper operation by helping the central processor make smarter decisions on power saving and system functionality.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Download ready-to-use system files to speed your design process.
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 | 24Vac Power Stage With Battery Fuel Gauge for Thermostat Reference Design | Mar. 09, 2017 | |
| Technical article | The power to innovate industrial design | PDF | HTML | Mar. 27, 2017 |
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.