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）：




图6。DER322参考设计PCB布局图（53.5 mm x 19.6 mm）：上：顶层；下：底层
详情请见：
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