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Powerint公司的LinkSwitch-PL系列產品集成了725V功率MOSFET,間斷模式可變頻率可變開態時間控制器,頻率抖動器,逐個周期的限流和滯后熱關斷等功能,具有高效率和高功率因素,它的控制算法提供無閃爍TRIAC調光,而外接元件最少.本文介紹了LNK460KG產品亮點,方框圖,典型應用電路,替代A19白熾燈5W 15V LED驅動電路圖以及20W LED驅動演示板主要特性和指標,電路圖,材料清單和PCB元件布局圖. High Efficiency (>90%), High Power Factor (>0.97), Low A-THD (<15%), 20 W Output Non-Isolated Buck LED Driver Using LinkSwitchTMPL LNK460KGHigh Efficiency (>90%), High Power Factor (>0.97), Low A-THD (<15%), 20 W Output Non-Isolated Buck LED Driver Using LinkSwitchTMPL LNK460KG 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. LNK460KG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.LNK460KG方框圖
圖2.LNK460KG典型應用電路圖
圖2.替代A19白熾燈5W 15V LED驅動電路圖 20W LED驅動演示板 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 240 mA from an input voltage range of 195 VAC to 265 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 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. 20W LED驅動演示板主要特性: Low cost, low component count (29 parts), small size (height <8 mm), and single-sided PCB Single-stage power factor correction and constant current (CC) output Highly energy efficient, >90% Integrated protection and reliability features Output short-circuit protection with auto-recovery Auto-recovering thermal shutdown with hysteresis No damage during brown-out conditions PF >0.97, % ATHD <15% at nominal 230 VAC input Easily meets Class C harmonic requirement (>25 W) even with multiple tubes in parallel operation Meets 1 kV differential line surge and EN55015 conducted EMI
圖3.20W LED驅動演示板外形圖 20W LED驅動演示板主要指標:
圖4.20W LED驅動演示板電路圖 20W LED驅動演示板材料清單(BOM):
圖5.20W LED驅動演示板元件布局圖 詳情請見: 
linkswitch-pl_family_datasheet.pdf
(1.75 MB)
der337.pdf
(5.55 MB)
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