Powerint公司的DER322參考設計采用LinkSwitch-PL系列LNK460VG器件，是業界首個可替代100W A19白熾燈的LED驅動器，采用單層PCB，具有低成本少元件數和小尺寸特點，230VAC時的效率大于93%，PF大于0.9，230 VAC; 78 V LED時的THD小于20%，集成了包保護和可靠性特性，熱關斷自動恢復。本文介紹了LinkSwitch-PL系列產品亮點，方框圖，典型應用電路以及DER322參考設計主要特性和指標，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系列功能方框圖
圖2。LinkSwitch-PL系列典型應用電路圖
圖3。采用LinkSwitch-PL系列的替代A19白熾燈的5W 15V LED驅動器電路圖
DER322參考設計
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.
DER322參考設計主要特性：
? 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
圖4。DER322參考設計外形圖：上：頂視圖，下：底視圖
DER322參考設計電源指標：
圖5。DER322參考設計電路圖
DER322參考設計材料清單（BOM）：
圖6。DER322參考設計PCB布局圖（53.5 mm x 19.6 mm）：上：頂層；下：底層
詳情請見：
http://www.powerint.com/sites/default/files/product-docs/linkswitch-pl_family_datasheet.pdf
和
http://www.powerint.com/sites/default/files/PDFFiles/der322.pdf
