安森美CAT41033路恒流LED驱动方案

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1、安森美CAT41033路恒流LED驱动方案关键词：LED驱动器安森美(OnSemi)公司的CAT4103是3路恒流LED驱动器，设计用来控制RGBLED,它不需要电感和有低噪音的特性丄ED通路电流可通过外接电阻进行编程,高达175mA.高速4线25MHz串口，采用移位寄存器和闭锁配置来控制每个通路.工作电压3V到5.5V,并具有热关断特性.CAT4103可用于多种色彩智能LED建筑物照明,高亮度LED信号和显示以及LCD背景光.木文介绍了CAT4103的主要特性，功能方框图，典型应用电路图以及级联电路图，CAT41

2、03EVAL评估板电路图和评估板元件列表.TheCAT4103isa3-channel,linearbasedconstant-currentLEDdriverdesignedforRGBLEDcontrol,requiringnoinductorandprovidesalownoiseoperation.LEDchannelcurrentsupto175mAareprogrammedindependentlyviaseparateexternalresistors.Lowoutputvoltageoperatio

3、nof0.4Vat175mAallowsformorepowerefficientdesignsacrosswidersupplyvoltagerange.ThethreeLEDpinsarecompatiblewithhighvoltageupto25VsupportingapplicationswithlongstringsofLEDs・Ahigh-speed4-wire25MHzserialinterfacecontrolseachindividualchannelusingashiftregisterand

4、latchconfiguration.Outputdatapinsallowmultipledevicestobecascadedandprogrammedviaoneserialinterfacewithnoneedforexternaldriversortimingconsiderations.Thedevicealsoineludesablankingcontrolpin(BIN)thatcanbeusedtodisableallchannelsindependentlyoftheinterface.Ther

5、malshutdownprotectionisincorporatedinthedevicetodisabletheLEDoutputswheneverthedietemperatureexceeds150QC.Thedeviceisavailableina16-leadSOICpackage.CAT4103主要特性：3independentcurrentsinksratedto25VLEDcurrentto175mAperchannelsetbyseparateexternalresistorsHigh-spee

6、d25MHz4-wireserialinterlaceBufferedoutputdriverstoensuredataintegrityCascadabledevicesLowdropoutcurrentsource(0.4Vat175mA)3Vto5.5VlogicsupplyThermalshutdownprotectionRoHS-compliant16-leadSOICpackageCAT4103应用：Multi-color,intelligentLED,architecturallightingHigh

7、-visualimpactLEDsignsanddisplaysLCDbacklight

8、皿观］SHiFFREGISTERCLOCK81ANKTf-.CURRENTSTiKS00©11LOLI121-

9、11SOS1S20:RSET1LOUTSOUTCOUT图1.CAT4103功能方框图VNO5Vto25VCONTROUERvcoLED1IED2LED39NBOUTLtiCAT4103LOUTSNSOUTONCOUTGNDRSET1RS€T2RSST3—1-・图2.CAT4103典型应用电路图NEXTCAT410JD

10、6VCET丄C25O—•—丄C，T"VDDIED1Le(>2LEO3=VOOLK)1LE02LeoaVOOLED1LED：LEWBOUTBINBOUTBl%&0UTUNCAT4103LOUT■CAT4103LOUT5CAT4103LOUT$•4souruhnSOUTsourCINgouteouTCjhCOUTWWWcteRSET1RSGT2R$£T3GNO