美芯晟 MT9522SF LED驱动芯片：美芯晟MT9522SFLED驱动芯片M

原标题：美芯晟MT9522SFLED驱动芯片
MT9522SF是一款集成整流桥和超快恢复续流二极管的高功率因数、非隔离LED驱动芯片。它采用实地降压式开关电源的架构，工作在准谐振模式，同时使效率和抗电磁干扰的性能都得到提升。
MT9522SF通过内部集成的高压供电电路供电，无需外部VDD电容。通过内部数字积分器实现误差积分功能，节省了COMP管脚及COMP电容。 MT9522SF通过内部集成的THD补偿电路，可以满足更低THD和奇次谐波的需求。
MT9522SF内部集成了多重的保护功能，比如输入过压保护、逐周期过流保护、过温折返保护、输出短路保护、输出开路保护等等，提高了可靠性，并且所有保护均具有自恢复功能。芯片通过ROVP脚的外部电路连接（如开路、接地或连接不同阻值的电阻），来调节输出过压保护功能。
MT9522SF内置整流桥，续流二极管，反馈电路， CS电阻以及高压MOSFET ，极大地精简了外围电路，节省了BOM成本。

文章图片
MT9522SF原理图
主要特点
单级有源PFC实现了高功率因数（功率因数>0.9）
内部集成整流桥
内置超快恢复续流二极管
内置高压供电电路，无需外置VDD电容及供电电路内置积分器，无需外置COMP电容
节省外置CS电阻
集成THD补偿电路
集成奇次谐波补偿电路，抑制高次谐波失真
内置线电压补偿
内置驱动脚去磁检测，节省外置反馈电阻
高精度的LED输出电流
输入低压降电流保护
优异的线性调整率和负载调整率
临界导通模式运行
集成输入过压保护，输入电压高于375Vac关断， 320Vac恢复。抗浪涌能力强，更加安全可靠
通过ROVP脚，设置不同输出过压保护阈值
多种保护和自动恢复功能
具有软启动功能
ASOP7封装
MT9522SFisahighpowerfactor,non-isolatedLEDdriverchipwithintegratedrectifierbridgeandsuperfastrecoverycontinuousdiode.Itworksinquasi-resonancemodewiththestructureoffieldvoltage-loweringswitchingpowersupply,andimprovesefficiencyandanti-electromagneticinterferenceperformance.
MT9522SFispoweredbyaninternallyintegratedhighvoltagepowersupplycircuitwithouttheneedforexternalVDDcapacitors.Theerrorintegralfunctionisimplementedbyaninternaldigitalintegrator,whichsavesCOMPpinsandCOMPcapacitance.MT9522SFcansatisfylowerTHDandoddharmonicrequirementsthroughanintegratedTHDcompensationcircuit.
MT9522SFintegratesmultipleprotectionfunctions,suchasinputover-voltageprotection,cycle-by-cycleover-currentprotection,over-temperaturereturnprotection,outputshort-circuitprotection,outputopen-circuitprotection,etc.toimprovereliability,andallprotectionhasself-recoveryfunction.ThechipadjuststheoutputovervoltageprotectionfunctionthroughtheexternalcircuitconnectionoftheROVPfoot,suchasopencircuit,groundconnectionorresistanceconnectingdifferentresistancevalues.
MT9522SF'sbuilt-inrectifierbridge,continuouscurrentdiode,feedbackcircuit,CSresistanceandhighvoltageMOSFETgreatlysimplifytheperipheralcircuitandsaveBOMcosts.
mainfeatures
Single-stageactivePFCachieveshighpowerfactor(powerfactor>0.9)
Internalintegratedrectifierbridge
Built-inUltraFastRecoveryContinuousDiode
Built-inhighvoltagepowersupplycircuit,noneedforexternalVDDcapacitanceandpowersupplycircuitBuilt-inintegrator,noneedforexternalCOMPcapacitance
SaveexternalCSresistance
IntegratedTHDCompensationCircuit
Integratedoddharmoniccompensationcircuittosuppresshighharmonicdistortion
Built-inlinevoltagecompensation
Degaussingdetectionwithbuilt-indriverfootsavesexternalfeedbackresistance
HighPrecisionLEDOutputCurrent
InputLowVoltageDownCurrentProtection
Excellentlinearandloadadjustmentrates
Criticalconductionmodeoperation
Integratedinputovervoltageprotection,inputvoltageabove375Vacoff,320Vacrecovery.Strongsurgeresistance,moresafeandreliable
SettingdifferentoutputovervoltageprotectionthresholdsthroughtheROVPfooter
Multipleprotectionandautomaticrecoveryfunctions
Withsoftstartfunction
【美芯晟 MT9522SF LED驱动芯片】ASOP7Packaging