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.
图1.EMI板和降压-升压板外形图
18W T8管灯LED驱动器(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管灯LED驱动器主要指标:
图2.18W T8管灯LED驱动器电路图
18W T8管灯LED驱动器材料清单:
详情请见:
