PowerintLNK419EG18WT8管燈LED驅動設計方案(DER298)

LED驅動器采用LinkSwitchTM-PH系列LNK419EG,輸入電壓90VAC到265VAC,輸出電壓200V/90mA.拓撲采用單級非隔離降壓-升壓,具有緊湊和低元件數的特點,線路和負載調整有于2%,110VAC的效率大于89.5%, THD小于20%,而230VAC時的效率大于90%,THD小于28%.本文介紹了設計方案DER298的主要特性,優勢和指標,電路圖和材料清單.

Constant Current (2% Regulation), Non-Isolated Buck-Boost, Power Factor Corrected,18 W LED Driver Using LinkSwitchTM-PH LNK419EGT8 Tube Retrofit LED Driver

The document describes a universal, non-isolated, high efficiency, high power factor (PF) LED driver designed to drive a nominal LED string voltage of 200 V at 90 mA from an input voltage range of 90 VAC to 265 VAC. The LED driver utilizes the LNK419EG from the LinkSwitch-PH family of ICs.

The topology used is a single-stage non-isolated buck-boost that meets the stringent space requirements for this design. Enhanced line and load output current regulation requirement is achieved by directly sensing and regulating the output current. High power factor and low THD is achieved by employing the LinkSwitch-PH IC which also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Line overvoltage provides extended line fault and surge withstand, and accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions.

圖1.EMI板和降壓-升壓板外形圖

18W T8管燈LED驅動器(DER298)主要特性:

? Designed for linear fluorescent LED tube retro fit applications

? Compact, low component count design – fits into ends of tube enclosure

? Frequency jitter for smaller, lower cost EMI filter components

? Excellent line and load regulation, 2% typical

? Highly energy efficient

? ≥89.5% at 110 VAC

? ≥90% at 230 VAC

? Power factor corrected

? PF >0.93 across line and load, EN61000-3-2(c) compliant

? A-THD 28% (230 VAC), 20% (115 VAC)

? Integrated protection and reliability features

? Output short-circuit protected with auto-recovery

? Line input overvoltage shutdown extends voltage withstand during line faults.

? Auto-recovering thermal shutdown with large hysteresis protects both components and
printed circuit board

? IEC 61000-4-5 ring wave and surge and EN55015 B conducted EMI compliant 18W T8管燈LED驅動器主要指標:



圖2.18W T8管燈LED驅動器電路圖

18W T8管燈LED驅動器材料清單:

詳情請見:
http://www.powerint.com/sites/default/files/PDFFiles/der298.pdf