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Off-the-Line Primary Side Regulation LED Lamp Driver With Single-Stage PFC and T
提出基于VFT和DVT方法的离线式原边调节LED驱动方案，支持高功率因数和TRIAC调光。
0.35μm BCD工艺, 0.76mm²面积, 效率>81%, 功率因数>0.9, 负载调节率0.43%-0.89%
LED驱动原边调节功率因数校正TRIAC调光离线式电源
▸创新点1：LED正向电压跟踪(VFT)方法通过实时监测LED负载的电压变化动态调整反馈机制，实现了高达0.89%的负载调整率，显著提升了系统稳定性与能效（效率>81%）
▸创新点2：占空比变化跟踪(DVT)方法创新性地利用MOSFET栅极信号与输入电压的关联性，在180-260V宽电压范围内实现0.51%的线路调整率，同时保持功率因数>0.9
▸创新点3：提出的四种衍生电路架构（TYPE-I至IV）通过差异化配置供电电压、漏极电压和占空比检测电路，在单级PFC拓扑中实现0.43%-0.56%的负载调整率，扩展了应用场景灵活性
▸创新点4：集成化芯片设计采用0.35μm BCD工艺，在0.76mm²面积内整合了VFT/DVT控制核心与功率器件，实现12W驱动能力，兼具TRIAC调光兼容性
Abstract
The off-the-line primary side regulation flyback LED
lamp driver is proposed based on LED forward voltage tracking
(VFT) and duty variation tracking (DVT) methods, which satisfy
good line/load regulation, high power factor and TRIAC dim-
ming possibility. This paper introduces that four derivative types
(TYPE-I to IV) are possible to implement using supply voltage,
MOSFET drain voltage and duty cycle signal with the four types
of sensing circuits on the basis of VFT and DVT concepts. The
load reg