Adaptive line voltage compensation scheme for a source-driving controlled AC–DC LED driver
作者： Changyuan Chang , Tianlin Jiang , Penglin Yang , Yang Xu , Chunxue Xu
DOI: 10.1049/IET-CDS.2016.0171
关键词:
摘要: A primary-side controlled high-precision constant current AC-DC LED driver, based on source-driving control scheme, is designed for low-power LED-lighting applications in this study. The ratio between demagnetisation time T Demag and switching period S the primary peak are remained by proposed IC, obtaining output. Meanwhile, an adaptive line voltage compensation circuit, integrated controller, scheme. proportional to injected sampling pin CS, thus making turn-off bandgap reference of under high-line lower than that low-line voltage. As a consequence, overshoot phenomena can be avoided, regulation as well precision output improved. IC has been fabricated TSMC 0.35 μm 5 V/650 V CMOS/LDMOS process. Experimental results W prototype show kept stable at ~250 mA, within ±0.5% wide range universal-input ac from 85 264 V, >80% efficiency obtained heavy loads.
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