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Design Aspects of a Single-Output Multi-String WLED Driver Using 40 nm CMOS Technology

Department of Electrical Engineering, Princess Sumaya University for Technology, P.O. Box 1438 Al-Jubaiha, Amman 11941, Jordan
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Academic Editor: Andrea Acquaviva
J. Low Power Electron. Appl. 2022, 12(1), 5; https://doi.org/10.3390/jlpea12010005
Received: 21 December 2021 / Revised: 11 January 2022 / Accepted: 14 January 2022 / Published: 18 January 2022
This work presents various essential features and design aspects of a single-inductor, common-output, and multi-string White Light Emitting Diode (WLED) driver for low-power portable devices. High efficiency is one of the main features of such a device. Here, the efficiency improvement is achieved by selecting the proper arrangement of WLEDs and a proper sensing-circuit technique to determine the minimum, real-time, needed output voltage. This minimum voltage necessary to activate all WLEDs depends on the number of strings and the forward voltage drops among the WLEDs. Advanced CMOS technology is advantageous in mixed-signal environments such as WLED drivers. However, this process suffers from low on-resistance, which degrades the accuracy of the current sinks. To accommodate the above features and mitigate the low node process issue, a boost-converter that is single output with a load of a three-string arrangement, with 6 WLEDs each, is presented. The designed driver has an input voltage range of 3.2–4.2V. The proposed solution is realized with ultra-low power consumption circuits and verified using ADS tools utilizing 40 nm 1P9M TSMC CMOS technology. An inter-string current accuracy of 0.2% and peak efficiency of 91% are achieved with an output voltage up to 25 V. The integrated WLED driver circuitry enables a high switching frequency of 1MHz and reduces the passive elements’ size in the power stage. View Full-Text
Keywords: DC-DC boost converter; multi-string; current matching; WLED; backlighting; 40 nm CMOS process DC-DC boost converter; multi-string; current matching; WLED; backlighting; 40 nm CMOS process
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MDPI and ACS Style

Shahroury, F.R.; Ahmad, H.H.; Abuishmais, I. Design Aspects of a Single-Output Multi-String WLED Driver Using 40 nm CMOS Technology. J. Low Power Electron. Appl. 2022, 12, 5. https://doi.org/10.3390/jlpea12010005

AMA Style

Shahroury FR, Ahmad HH, Abuishmais I. Design Aspects of a Single-Output Multi-String WLED Driver Using 40 nm CMOS Technology. Journal of Low Power Electronics and Applications. 2022; 12(1):5. https://doi.org/10.3390/jlpea12010005

Chicago/Turabian Style

Shahroury, Fadi R., Hani H. Ahmad, and Ibrahim Abuishmais. 2022. "Design Aspects of a Single-Output Multi-String WLED Driver Using 40 nm CMOS Technology" Journal of Low Power Electronics and Applications 12, no. 1: 5. https://doi.org/10.3390/jlpea12010005

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