LED driver IC with an adaptive slope compensation technique

2010 ◽  
Author(s):  
Wooju Jeong ◽  
Jungeui Park ◽  
Jungsoo Choi ◽  
Seok Lee ◽  
Junsang Lee ◽  
...  
Keyword(s):  
Led Driver ◽  
Slope Compensation ◽  
Compensation Technique

A Boost White LED Driver with an On-Chip Compensator

2012 ◽  
Vol 588-589 ◽  
pp. 798-801
Author(s):  
Fei Zhou ◽  
Le Nian He
Keyword(s):  
Equivalent Circuit Model ◽  
Current Mode ◽  
Led Driver ◽  
Load Range ◽  
High Loop ◽  
In Series ◽  
Compensation Technique ◽  
Layout Area ◽  
White Led Driver ◽  
On Chip

A monolithic peak-current-mode boost WLED driver with an on-chip compensator is presented. In order to predict the system performance, the equivalent circuit model of boost WLED driver is constructed to obtain the system transfer function. Then, an on-chip compensator, which requires small layout area, is analyzed and designed. The simulation results, based on CSMC 0.5µm 40V BCD technology, show that the internal compensation technique provides high loop accuracy and stability over a wide load range from 20mA to 180mA. The proposed driver is capable of driving 10WLEDs connected in series or 3WLEDs with 9 strings in parallel. Protection circuits, such as over voltage protection (OVP), over temperature protection (OTP), over current protection (OCP) and under voltage lockout (UVLO) are also utilized to guarantee the safe operations of the system.

scholarly journals Piecewise Quadratic Slope Compensation Technique for DC-DC Switching Converters

2020 ◽  
pp. 1-12 ◽  
Author(s):  
Abdelali El Aroudi ◽  
Kuntal Mandal ◽  
Mohammed S. Al-Numay ◽  
Damian Giaouris ◽  
Soumitro Banerjee
Keyword(s):  
Switching Converters ◽  
Slope Compensation ◽  
Compensation Technique

Design, Development and Practical Realization of a VLC Supportive Indoor Lighting System

2020 ◽  
pp. 87-97
Author(s):  
Sourish Chatterjee ◽  
Biswanath Roy
Keyword(s):  
Data Communication ◽  
Cost Effective ◽  
Ambient Light ◽  
Lighting System ◽  
Design Development ◽  
Led Driver ◽  
Communication Performance ◽  
Good Communication ◽  
Simulink Model ◽  
Light Interference

In an office space, an LED-based lighting system allows you to perform the function of a data transmitter. This article discusses the cost-effective design and development of a data-enabled LED driver that can transmit data along with its receiving part. In addition, this paper clearly outlines the application of the proposed VLC system in an office environment where ambient light interference is a severe issue of concern. The result shows satisfactory lighting characteristics in general for this area in terms of average horizontal illuminance and illuminance uniformity. At the same time, to evaluate real-time and static communication performance, Arduino interfaced MATLAB Simulink model is developed, which shows good communication performance in terms of BER (10–7) even in presence of ambient light noise with 6 dB signal to interference plus noise ratio. Our designed system is also flexible to work as a standalone lighting system, whenever data communication is not required.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

2011 ◽  
Vol 57 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Mariusz Zamłyński ◽  
Piotr Słobodzian
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Planar Antenna ◽  
Sidelobe Level ◽  
Edge Diffraction ◽  
Narrow Angle ◽  
Compensation Technique ◽  
Diffraction Effects ◽  
Linear Antenna Arrays

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. -50 dB) could be achieved in practice. In the presence of diffraction effects -46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to ±60°).

A transient macro model of GGNMOS used in white LED driver ESD protection simulation

2014 ◽  
Author(s):  
Yu-xi Jiang ◽  
Mao-ze Li ◽  
Jiao Li ◽  
Gao-chuang Bai ◽  
Yuan-zhang Guo ◽  
...  
Keyword(s):  
White Led ◽  
Led Driver ◽  
Macro Model ◽  
Esd Protection ◽  
White Led Driver
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