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High-Efficiency 24 VAC to 5 V, 3.3 V Reference Design With Battery Backup and Charging
TIDUF26
june 2023
BQ24072
,
LMR36520
,
TLV62568
,
TPS2116
CONTENTS
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High-Efficiency 24 VAC to 5 V, 3.3 V Reference Design With Battery Backup and Charging
1
Description
Resources
Features
Applications
6
1
System Description
1.1
Key System Specifications
2
System Overview
2.1
Block Diagram
2.2
Design Considerations
2.2.1
24 VAC to DC Rectification
2.2.2
eFuse Protection
2.2.3
5-V Rails
2.2.3.1
LMR36520 Voltage Rail
2.2.3.2
USB Power Input
2.2.4
Power Source ORing
2.2.5
Battery Management
2.2.6
3.3-V Power Rail
2.2.7
Power Rail Current Sensing
2.2.8
Backlight LED Driver
2.2.9
BoosterPack Overview
2.3
Highlighted Products
2.3.1
LMR36520
2.3.2
TPS2116
2.3.3
TLV62568
2.3.4
INA2180
2.3.5
TPS92360
2.3.6
TPS2640
2.3.7
BQ24072
3
Hardware, Software, Testing Requirements, and Test Results
3.1
Hardware Requirements
3.2
Test Setup
3.3
Test Results
3.3.1
24-VAC Start-Up and Shutdown
3.3.2
USB Start-Up and Shutdown
3.3.3
ORing
3.3.4
LMR36520
3.3.5
TLV62568 Transient Response
3.3.6
BM24072 Transient Response
3.3.7
TLV62568 (3V3 Power Rail)
3.3.8
LMR36520 (LMOut Power Rail)
3.3.9
BM24072 (BMOut Power Rail)
3.3.10
Reference
3.3.10.1
TLV62568
3.3.10.2
LMR36520
4
Design and Documentation Support
4.1
Design Files
4.1.1
Schematics
4.1.2
BOM
4.2
Tools and Software
4.3
Documentation Support
4.4
Support Resources
4.5
Trademarks
5
About the Author
IMPORTANT NOTICE
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Design Guide
High-Efficiency 24 VAC to 5 V, 3.3 V Reference Design With Battery Backup and Charging