PI公司（Power Integrations, Inc）在2011年Mar月18日发布了一份可兼容大范围可控硅调光器的6.9W LED驱动器的设计范例报告(DER-269：Broad TRIAC Dimmer Capability 6.9W LED Driver Using LinkSwitch-PH LNK404EG)。这款新的驱动器设计具有非常出色的性能和极高能效，且采用频率抖动技术，可使用尺寸更小、成本更低的EMI滤波元件。

该设计范例主要特性包括：
. 干净的单向启动 – 无输出闪烁
. 快速启动(<100ms) – 无可见延迟
. 产品间具有一致的调光性能
. 输出开路/输出短路保护，带自动恢复功能
. 输入过压关断可扩展输入故障时的电压耐受范围

Table of Contents
1 Introduction.......................................................4
2 Prototype Provisions to Meet Safety Standards .....................6
3 Power Supply Specification ........................................7
4 Schematic..........................................................8
5 Circuit Description ...............................................9
5.1 Input Filtering..................................................9
5.2 LinkSwitch-PH Primary............................................9
5.3 Bias and Output Rectification ...................................9
5.4 TRIAC Phase Dimming Control......................................9
5.5 TRIAC Active Load................................................10
6 PCB Layout ........................................................11
7 Bill of Materials .................................................14
7.1 Main Board ......................................................14
7.2 Daughter Board ..................................................15
8 Transformer Specification..........................................16
8.1 Electrical Diagram ..............................................16
8.2 Electrical Specifications........................................16
8.3 Materials........................................................16
8.4 Transformer Build Diagram .......................................17
8.5 Transformer Construction.........................................17
9 Transformer Design Spreadsheet.....................................18
10 Performance Data..................................................21
10.1 Efficiency......................................................22
10.2 Line and Load...................................................23
10.3 Power Factor ...................................................24
10.4 Total Harmonic Distortion.......................................25
11 Thermal Performance ..............................................26
11.1 Non-Dimming Measurements........................................26
11.2 Dimming Measurements............................................28
12 Harmonic Data ....................................................29
12.1 8 LED Load ~23 V Output ........................................29
12.2 9 LED Load ~27 V Output ........................................31
12.3 10 LED Load ~29 V Output .......................................33
13 Waveforms.........................................................35
13.1 Drain Voltage and Current.......................................35
13.2 Output Diode Peak Inverse Voltage ..............................35
13.3 Input Line Voltage and Current (No TRIAC Dimmer Connected) .....36
13.4 Input Voltage and Input Current Waveforms (During Dimming) .....36
13.5 Output Voltage and Ripple Current ..............................37
13.6 Drain Voltage and Current Start-up Profile .....................38
13.7 Output Current and Drain Voltage at Shorted Output..............39
13.8 Open Load Output Voltage........................................39
14 Dimmer Compatibility..............................................40
14.1 Korean Dimmer: New Touch, 120 W.................................40
14.2 German Dimmer: REV300, 300 W....................................41
14.3 German Dimmer: BUSCH 2250, 600 W ...............................42
14.4 German Dimmer: MERTEN 572499, 400 W.............................43
14.5 German Dimmer: BERKER 2875, 600 W ..............................44
15 Conducted EMI ....................................................45
15.1 Conducted EMI Test Set-up ......................................46
16 Revision History .................................................47

查询进一步信息，请访问http://www.powerint.com/sites/default/files/PDFFiles/der269.pdf，以及http://www.powerint.com/zh-hans/design-support。