用于快速启动和调光瞬态性能的恒定开/关时峰值电流控制的Boost LED驱动器的设计技术

Dipayan Chatterjee, S. Kapat, Reddi Kiran Poola, Ravikumar Setty A, Sucheendran Sridharan
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引用次数: 0

摘要

基于升压变换器的LED驱动器主要用于便携式显示设备,由于右半平面(RHP)零的不利影响,高电压增益使得难以实现快速启动和调光性能。在大多数商业产品中,采用固定频率电流模式控制(CMC)技术。这需要电流环稳定性的过度补偿斜坡,这将倾向于使用ii型补偿器降低相位裕度。恒定停机时间(COFT) CMC可能不需要任何斜坡补偿,可以实现优越的性能。然而,合适的设计方法并不容易用于确定使用固定频率和COFT CMC架构的性能限制。本文介绍了CMC结构中ii型控制器的小信号设计和性能限制。此后,开发了一种基于轨迹的设计方法,使用可复位PI控制器来识别关键性能限制,该控制器可以在有无峰值电流限制的情况下实现接近时间最优的性能。通过使用低压LED串,启动性能得到进一步改善,然而,以增加引脚数为代价。最后,确定了一种在基于峰值电流的恒开/关时间多模控制器中实现平滑控制器过渡的方法。给出了几个商用LED驱动器的性能限制的实验结果,并在相同规格下,使用所提出的设计框架进行了性能改进,并使用仿真结果进行了演示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design Techniques in Constant on/off-Time Peak Current Controlled Boost LED Drivers for Fast Start-up and Dimming Transient Performance
A boost converter-based LED driver is predominantly used in portable display devices, where the high voltage gain makes it difficult to achieve fast start-up and dimming performance, because of the detrimental effect of the right-half-plane (RHP) zero. In the majority of commercial products, a fixed-frequency current mode control (CMC) technique is used. This requires an over-compensated ramp for current-loop stability, which would tend to degrade the phase margin using a type-II compensator. Constant off-time (COFT) CMC may not require any ramp compensation and can achieve superior performance. However, suitable design methods are not readily available to identify performance limits using fixed-frequency and COFT CMC architectures. This paper presents the small-signal design and performance limitations of a type-II controller in CMC architectures. Thereafter, a trajectory-based design approach is developed to identify critical performance limits using a resettable PI controller, which can achieve near time-optimal performance with and without a peak current limit. Start-up performance is shown to be further improved by using a low voltage LED string, however, at the cost of an increasing pin count. Finally, a method is identified to achieve smooth controller transitions in a peak current-based constant on/off-time multi-mode controller. Experimental results of a few commercial LED drivers with their performance limits are presented, and for the same specs, the performance improvement using the proposed design framework is demonstrated using simulation results.
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