Journal
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
Volume 173, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.aeue.2023.155028
Keywords
SIMO; OVP; Multi-output; Multi-display; High-side switch; WLED driver; Current sink
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This paper presents a WLED driver solution for multi-display screen systems, featuring a single-inductor power stage with independent outputs and multiple WELD strings with independent digital brightness/dimming control for each display. The inclusion of high-side switches enables independent output voltage control and minimized power consumption.
This paper presents a WLED driver solution for multi-display screen systems. The proposed solution features a single-inductor power stage with independent outputs; each display has multiple WELD strings with independent digital brightness/dimming control. The inclusion of high-side switches at the output terminals enables independent output voltage control and seamless display module activation/deactivation with minimized power consumption. The proposed circuit solution is designed and simulated using TSMC 40 nm technology with a digitally rich implementation that may easily scale to any node process. A three-display system, each with three strings with 6 WELDs, is utilized to demonstrate the efficacy of the solution and verify the functionality of the system. The system is driven by a single battery with a 3.2-4.2 V range and uses a 1 MHz switching frequency clock. The output voltage of the three modules can be configured independently from 7 V to 30 V with a common overvoltage protection circuit.
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