PI公司（Power Integrations, Inc）在2011年Mar月18日發(fā)布了一份可兼容大范圍可控硅調(diào)光器的6.9W LED驅(qū)動器的設(shè)計范例報告(DER-269：Broad TRIAC Dimmer Capability 6.9W LED Driver Using LinkSwitch-PH LNK404EG)。這款新的驅(qū)動器設(shè)計具有非常出色的性能和極高能效，且采用頻率抖動技術(shù)，可使用尺寸更小、成本更低的EMI濾波元件。

該設(shè)計范例主要特性包括：
. 干凈的單向啟動 – 無輸出閃爍
. 快速啟動(<100ms) – 無可見延遲
. 產(chǎn)品間具有一致的調(diào)光性能
. 輸出開路/輸出短路保護，帶自動恢復(fù)功能
. 輸入過壓關(guān)斷可擴展輸入故障時的電壓耐受范圍

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

查詢進一步信息，請訪問http://www.powerint.com/sites/default/files/PDFFiles/der269.pdf，以及http://www.powerint.com/zh-hans/design-support。