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    s-oil回首頁

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    應用方案
    +日光燈應用

    日光燈應用

    基于LN2541的非隔離LED日光燈應用方案
    ——18W恒流驅動(24串12并)

    1. 簡介

    本文是一份基于LN2541設計的低成本非隔離LED日光燈應用方案報告。
    LN2541 是一款驅動LED的恒流控制芯片,系統應用電壓范圍從12VDC 到600VDC,占空比最大可達100%。支持交流85V-265V輸入,主要應用于非隔離的LED 驅動系統。本方案需驅動24串12并的LED陣列,輸入電壓范圍為176VAC-265VAC。
    本文內容包括電路原理圖、材料清單、PCB圖、性能測試數據和關鍵元器件計算方法。

    方案基本特性:

    • 極少的外圍器件
    • 輸入電壓范圍:176VAC-265VAC/50Hz
    • 系統效率:90%
    • 功率因數:0.9 
    • 占空比最高可達百分之百
    • 支持模擬調光
    • 內置抖頻技術,降低EMI 干擾
    • 開路保護、短路保護、過溫保護

     

    2.原理圖

    圖片1.png
    注:該應用輸入為176VAC-265VAC,輸出76V/240mA(24串12并)。

    3.PCB圖及樣機圖片

    圖片2.png
    PCB圖(單面板)

    圖片3.png
    24串12并樣機圖片

    4.BOM

    0.jpg

    5.測試參數

    5.1線性調整度

    不同的輸入交流電壓下對應的輸出電流

    0.jpg

    圖片1.png

    5.2效率

    不同的輸入交流電壓下對應的效率

    0.jpg

    圖片1.png

    5.3功率因數

    不同的輸入交流電壓下對應的功率因數

    0.jpg

    5.4相關波形

    5.4.1實測Toff波形 Toff=5uS

    圖片1.png

    5.4.2輸出電流紋波 IRIPPLE=72mA

    圖片2.png

    5.5.調光情況

    圖片3.png
    在DIM腳接一個100K的可調電阻,可以實現0-100%調光,曲線如上圖所示。

    6.關鍵元器件參數設計

    基本設計參數:

    0.jpg
    注:每顆LED的壓降VF=3.2V,電流ILED=20mA。

    相關參數計算

    輸出功率:           POUT= VOUT* IOUT=76.8V*240mA=18.4W
    電感的峰值電流:     IP=IOUT+IOUT*33%*0.5=[240+240*0.5/3]mA=280mA
    電感的紋波電流:     IRIPPLE=2*(IP-IOUT)=2*(279.6mA-240mA)=80mA
    關斷時間:           TOFF=5uS

    6.1.電感

    L= VOUT*TOFF/ IRIPPLE=76.8V*5uS/80mA=4.8mH,取常用規格5mH。
    電感線徑:因為IOUT為240mA,所以
    線徑D=1.13*(1/J)^1/2,其中J為電流密度,這里取6
    那么D=1.13*(1/6)^1/2=0.226mm,取0.23mm。
    這里選擇線徑為0.23mm的5mH電感。

    6.2.TOFF設置電阻ROSC

    ROSC=TOFF/(4*10^-5)=5uS/(4*10^-5)=125K
    這里選擇電阻規格為:125K/0805/1%

    6.3.啟動電阻R1

    因為IVIN范圍是1mA-20mA
    則 Rmax=(VDCmin-10.5V)/1mA=(176*1.414-10.5)V/1mA=238K
    Rmin=(VDCmax-10.5V)/20mA=(265*1.414-10.5)V/20mA=18K
    所以,R1=(Rmax+ Rmin)/2=(238K+18K)/2=128K
    PRmax=IINopmax2*R1=0.0012*128K=0.128W
    這里取阻值為128K的0.5W電阻。

    6.4.采樣電阻

    RCS=VREF/IP=0.2V/280mA=0.71Ω
    PRCS=0.22/0.71W=0.056W,所以這里取0.71Ω/0805/1%

    6.5.開關管

    開關管耐壓值需大于輸入電壓的峰值
    則VDS>1.414*VINmax=1.414*265V=374.71V,盡量選擇導通電阻RDSON小的MOSFET
    這里選擇2N60,TO252-5L封裝。

    6.6.繼流二極管

    其反向耐壓值VRMS>1.414*VINmax=1.414*265V=374.71V,盡量選擇恢復時間快、導通壓降小的二極管,這里選擇HER207

    注意:本方案為非隔離架構,正常工作時,驅動板及LED燈板都帶電。安裝時,先將驅動連接到LED燈板后再通電。請嚴格遵守帶電操作規范,避免發生觸電事故!

    COPYRIGHT ? 上海南麟電子股份有限公司 2017 版權所有
    666彩票

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