A 90–260 $\mathrm{V}_{\text{AC}}$ Isolated Offline Single-Stage Single-Transformer-Winding Multiple-Output (STWMO) RGBW LED Driver with <0.7% Current Variation and Dimmable Current-Regulated Error-Based Control

This paper proposes an isolated offline single-stage single-transformer-winding multiple-output (STWMO) RGBW LED driver optimized for mood lighting systems. The proposed design reduces external components and system volume by utilizing a single transformer winding for multiple outputs. A cross-side error-sum feedback circuit (CS-ESFC) ensures precise and independent current regulation. Additionally, a switched-capacitor amplitude modulation (SC-AM) circuit addresses cross-regulation issues, maintaining stability during color and brightness adjustments. The driver achieves a peak efficiency of 90.45% with a current variation under 0.7% across a wide input voltage range of 90 to 260 VAC, offering a compact and cost-effective solution for RGBW LED drivers.