非隔离开关电源解决方案.pdf

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1、非隔离开关电源解决方案非隔离开关电源解决方案1-1不同应用的电源管理解决方案©2006NationalSemiconductorCorporation1-2非隔离电压转换AC/DC负载100V、:负载点数砖型字电、中间总线转换器源LED、18V砖、通信信型24V电号电负载点源铅源路、径镉电墙、插低压中间总线转换器池固式6V1,2,3定适墙12V配插轨器单式电适负载点压元锂配5.5V低压总线电器池,2.5V©2006NationalSemiconductorCorporation1-3高电压产品系列AC/DC负载100V、:砖负载点数型字电中间总线转换器、源LED、通18V、铅

2、砖信镉型24V信电电电号源池源负载点路、径墙、插LV中间总线转换器固式定适6V1,2,3墙插12V轨配器式电单适负载点压元配5.5VLV总线锂器电,池2.5V©2006NationalSemiconductorCorporation1-4高电压降压稳压器高电压降压稳压器1-5集成的降压稳压器产品系列1stGen2ndGen3rdGenCOT0.15-0.4ALM500880LM5009LM257xHVLM259xHV2.5A0.5-1A最大输入600.5–3A0.5–2A电压LM5005LM5007LM5010400.5–3A0.5–3A0.5–5A0.5–1.5A1.25–

3、3A20LM257xLM259xLM267xLM3100LM25007LM2695LM26965015025050075010002000(KHz)开关频率©2006NationalSemiconductorCorporation1-6LM5000、LM25000系列模式拓朴结构Vin最大负载频率FBVref软启动封装MSOP8LM5009COT非同步降压9V-100V0.15A<800KHz2.5V+2%-LLP84x4mmMSOP8LM5008COT非同步降压9V-100V0.4A<800KHz2.5V+2%-LLP84x4mmLM50079V-75VMSOP8COT非同

4、步降压0.5A<800KHz2.5V+2%-LM250079V-42VLLP84x4mmLM5010A6V-75VTSSOP14-EPCOT非同步降压1A<800KHz2.5V+2%是LM250106V-42VLLP104x4mmLM5005模拟7V-75V非同步降压2.5A<500KHz1.25V+1.5%是TSSOP20-EPLM25005电流模式7V-42V©2006NationalSemiconductorCorporation1-7LM5005宽输入电压、模拟电流模式控制器特性:VINLM5005BSTVINVOUT•7V-75V输入范围SDSW•模拟电流模式控制S

5、YNCCOMP•1.25V+1.5%电压基准ISGND•可调节输出电压，由1.25V开始•单电阻频率设置FBOUTRAMPRTSSVCC•振荡器同步输入•工作频率可调节，由50kHz至500kHz•可调节软启动•关断/待机输入LM25005–LM5005的42V版本!•热关断保护封装:TSSOP20-EP©2006NationalSemiconductorCorporation1-8LM5005方框图和应用示意图7-75VVinLM5005V3,4Vin7VCC1REGULATORR1OPEN5uAC8C11.225VC2THERMAL0.472.2UVLO2.22SDSHU

6、TDOWNSTANDBYBST20SHUTDOWNDISVinUVLOC70.7V0.022SDCLKDRIVERC12LEVELOPENR21110uASQSHIFTOPENSSL11.225VSW17,1833u5VC4RQ0.010.7VPWMC11PRE19330pC10C9C_LIMITD1150227FBCLKR7CSHD6-100C10C5ERRORIS15,16C60.01AMP1.75V0.5V/ATRACKopenSAMPLER4&49.9K+VinHOLD6COMPPGND13,14CLKIrRAMPGENERATOROSCILLATORIr=(5uAx

7、(Vin-Vout))AGND10R5+25uA5.11KCLKSYNCRTRAMPOUT58912R61.65KSYNCC3R3330p21K©2006NationalSemiconductorCorporation1-9模拟电流模式是如何工作的？Q1L1VinVoutA=1VoutVin-VoutVin5ux(Vin-Vout)25uACRAMPRAMPCONTROLTIMINGD1RAMPSIGNALFORPWMANDCURRENTLIMITIs0.5V/ASAMPLERs&RAMPHOLDSam