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Powerint公司的T8管20 W/85 V LED驅動器是采用LinkSwitchTM-PL系列的 LNK460KG器件,所用元件數量最少,效率大于87%,功率因素大于0.98,A-THD小于10%,輸出功率20W,可替代T8管燈.本文介紹了LNK460KG主要特性,框圖,典型應用電路,替代A19白熾燈的5W/15V LED驅動器電路圖,以及采用LNK460KG的T8 20W/85V LED驅動器主要特性和技術指標,電路圖,材料清單和PCB布局圖. The LinkSwitch-PL family enables a very small and low cost single-stage power factor corrected constant current driver for solid state lighting. Optimized for direct LED current sensing, the LinkSwitch-PL operates over a wide input voltage range delivering an output power of up to 16 W. The LinkSwitch-PL control algorithm provides flicker-free TRIAC dimming with minimal external components. Each device incorporates a 725 V rated power MOSFET, a novel discontinuous mode variable frequency variable on-time controller, frequency jitter, cycle by cycle current limit and hysteretic thermal shutdown in a monolithic 4-pin IC, available in SO-8C, eSOP-12, and eDIP-12 packages. LinkSwitch-PL系列產品亮點: Dramatically Simplifies Off-line LED Drivers • Flicker-free phase-controlled TRIAC dimming • Single stage power factor correction and accurate constant current (CC) output • Very low component count with small non-electrolytic bulk capacitor for compact replacement lamp designs • Compact SO8, eSOP, and eDIP packages • Completely eliminates control loop compensation Advanced Performance Features • Optimized for non-isolated flyback designs • Frequency jitter greatly reduces EMI filter size and costs • Low dissipation direct sensing of LED current Advanced Protection and Safety Features • Cycle skipping regulation for abnormally low output power to clamp peak output current delivered • 725 V integrated power MOSFET allows small bulk capacitance and maximizes power capability • Short-circuit, overload, open feedback and output overvoltage protection • Hysteretic thermal shutdown • Meets high-voltage creepage between DRAIN and all other pins both on PCB and at package EcoSmart™ - Energy Efficient • High power factor optimizes system lumen per input VA • Control algorithm balances switching and conduction losses over line and load to maintain optimum efficiency 
圖1.LinkSwitch-PL系列框圖
圖2.LinkSwitch-PL系列典型應用電路圖
圖2.采用LNK457DG的5W/15V LED驅動器,替代A19白熾燈 采用LNK460KG的T8 20W/85V LED驅動器(DER-345) The document describes a non-isolated, high efficiency, high power factor (PF) LED driver designed to drive a nominal LED string voltage of 85 V at 235 mA from an input voltage range of 85 VAC to 135 VAC (47 Hz – 63 Hz). The LED driver utilizes the LNK460KG from the LinkSwitch-PL family of ICs. The topology used is a single-stage non-isolated buck boost that meets the stringent space and efficiency requirements for this design. LinkSwitch-PL based designs provide high power factor (>0.9) meeting international requirements. This document contains the LED driver specification, schematic, PCB details, bill of materials, transformer documentation and typical performance characteristics. T8 20W/85V LED驅動器主要特性: Low cost, low component count (parts), small size (height <8 mm) PF >0.98, % ATHD <6% at nominal input Highly energy efficient, >87% at nominal input Single-stage power factor correction and constant current (CC) output Integrated protection and reliability features Output short-circuit and open load protected Auto recovery thermal shutdown with hysteresis No damage during brown-out conditions Meets 1 kV differential line surge IEC 61000-4-5 ring wave, IEC 61000-3-2 C harmonics and EN55015 B conducted EMI compliant
圖3.T8 20W/85V LED驅動器外形圖(180 mm x 16.4 mm x 8 mm). T8 20W/85V LED驅動器主要指標:
圖4.T8 20W/85V LED驅動器電路圖 T8 20W/85V LED驅動器材料清單:
圖5.T8 20W/85V LED驅動器PCB布局圖 詳情請見: 
linkswitch-pl_family_datasheet[1].pdf
(1.75 MB)
der345[1].pdf
(5.12 MB)
來源：網絡 |
