Abstract—A
primary-side controlled method is commonly used in flyback LED driver to
regulate output current by employing an auxiliary winding. However, owing to
intrinsic propagation delay in real-world circuits, a primary-side controlled
flyback converter experiences a worse line regulation. This paper proposes a
smart output current estimation scheme to improve line regulation for constant
on-time control, and it can be compatible with the current flyback topology. A
9.5-W prototype of the proposed flyback LED driver has been fabricated in
Nuvoton Technology Corporation 0.6-μm 5-V/40-V CMOS process. The maximum
switching frequency is set to around 100 kHz with universal-line input,
single-stage power factor correction for LED lighting applications.
Experimental results prove that the proposed scheme can improve the line
regulation within 1.5% and the power efficiency can be up to 89.7%.
(Index
Terms—Flyback converter, light-emitting diode (LED) driver, line regulation,
primary-side controlled.)
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