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Common-Anode Power Supply Solution for Common-Cathode LED Display
SLUAA69
July 2020 – MONTH
TPS548D22
CONTENTS
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Common-Anode Power Supply Solution for Common-Cathode LED Display
Trademarks
1
Introduction
1.1
LED Driver Methods
1.2
Power Supply Solutions for Common-Cathode LED Display
2
Principle of Synchronous Buck with Sinking Current Application
3
Design Considerations and Analysis
3.1
Choose an IC with Sufficient Current Sinking
3.2
Choose IC Supporting Negative OCP
3.3
Choose an IC Supporting Pre-Bias Startup
3.4
Analysis of System Startup
4
TI Devices and Functionalities
4.1
Negative OCP Functionality
4.2
Hiccup Mode and Latch-off Mode
4.3
UVP and OVP Functionality
5
TI Solution
6
Bench Test and Result
6.1
Bench Test Configuration
6.2
Startup Waveforms and Behaviors Analysis Overview
6.3
Startup Waveforms and Behaviors Analysis at the First OVP
6.4
Startup Waveforms and Behaviors Analysis after the First OVP
6.5
Waveforms and Behaviors Analysis of Startup Solution with Lazy Loading
7
Conclusion
8
References
IMPORTANT NOTICE
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