TIDA-01358

24-V AC Power Stage With Wide Vin Converter and Battery Backup Reference Design for Smart Thermostat

TIDA-01358

Design files

Overview

The TIDA-01358 reference design provides a low BOM cost, high efficiency power stage solution for smart thermostats and other gateway building automation end equipment. This power stage takes a 24Vac input and produces a 5V and 3.3V 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 24Vac brownout. The power-path capability provides battery power assistance allowing system load transient to exceed the current limit of the 24Vac to DC system, allowing a lower cost Wide Vin buck to be utilized.

Features
  • Battery backup
  • Independent battery charging and load path
  • Dynamic power path/battery power assist
  • High efficiency over entire load current range
  • USB over-curent compliant

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCE1A.PDF (4732 K)

Reference design overview and verified performance test data

TIDRPC5.PDF (595 K)

Detailed schematic diagram for design layout and components

TIDRPC6.PDF (81 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRPC7.PDF (311 K)

Detailed overview of design layout for component placement

TIDRPC9.ZIP (895 K)

Files used for 3D models or 2D drawings of IC components

TIDCD20.ZIP (502 K)

Design file that contains information on physical board layer of design PCB

TIDRPC8.PDF (1283 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24072Standalone 1-cell 1.5-A linear battery charger, Power Path, 4.2-V VBAT and VOUT=VBAT + 225mV

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

LM51663V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TLV620801.2A High Efficient Step Down Converter in 2x2mm SON Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Comparators

LM2903Dual differential comparator, automotive grade

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TPD2E2U06Dual 1.5-pF, 5.5-V, ±25-kV ESD protection diode with 5.5-A 8/20-uS surge rating for USB 2.0

Data sheet document-pdfAcrobat PDF open-in-new HTML
Load switches

TPS27081A8-V, 3-A, 44-mΩ load switch with adj. rise time

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide 24-V AC Power Stage With Wide VIN Converter and Battery Backup Ref Design (Rev. A) Feb. 06, 2017

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