原标题：Powerint LNK460VG 100W A19 LED灯电源方案(DER322)

　　powerint公司的DER322参考设计采用LinkSwitch-PL系列LNK460VG器件，是业界首个可替代100W A19白炽灯的LED驱动器，采用单层PCB，具有低成本少元件数和小尺寸特点，230VAC时的效率大于93%，PF大于0.9，230 VAC; 78 V LED时的THD小于20%，集成了包保护和可靠性特性，热关断自动恢复。本文介绍了LinkSwitch-PL系列产品亮点，方框图，典型应用电路以及 DER322参考设计主要特性和指标，电路图，材料清单和PCB布局图。

　　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系列产品亮点：

　　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

　　图1。LinkSwitch-PL系列功能方框图

　　图2。LinkSwitch-PL系列典型应用电路图

　　图3。采用LinkSwitch-PL系列的替代A19白炽灯的5W 15V LED驱动器电路图

　　DER322参考设计

　　High Efficiency (>93%), High Power Factor(>0.9), 18 W Output Non-Isolated Buck LED Driver Using LinkSwitchTM-PL LNK460VG

　　The document describes a non-isolated, high efficiency, high power factor (PF) LED driver designed to drive a nominal LED string voltage of 78 V at 230 mA from an input voltage range of 195 VAC to 265 VAC (47 Hz – 63 Hz). The LED driver utilizes the LNK460VG 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.

　　DER322参考设计主要特性：

　　 Single-stage power factor correction combined with constant current (CC) output

　　 Low cost, low component count, small size and single-sided PCB

　　 Highly energy efficient, >93% at 230 VAC input for 78 V LED Load

　　 Integrated protection and reliability features

　　 Single shot no-load protection / output short-circuit protected with auto-recovery

　　 Auto-recovering thermal shutdown with large hysteresis protects both components and PCB

　　 No damage during brown-out conditions

　　 PF >0.9 at 230 VAC

　　 % ATHD <20% at 230 VAC; 78 V LED

　　 Meets IEC ring wave, differential line surge and EN55015 conducted EMI

　　图4。DER322参考设计外形图：上：顶视图，下：底视图

　　DER322参考设计电源指标：

　　图5。DER322参考设计电路图

　　DER322参考设计材料清单(BOM)：