深圳世微半导体推出各种类型的方案升压方案 降压方案 恒流方案 DC-DC方案 AC-DC方案 ：13530846306 蔡生 QQ: 2355558461
典Features DescriptionProgrammable Charge Current Up to 800mA典型应用电路图DRVVSNVSPOVPVSSRDVDDAP7112SWVinACRCSRSETVIN 图1：AP7112典型应用电路图1（无输出电容）概述AP7112是具有自供电功能的高精度降压型大功率LED恒流驱动芯片，适用于交流85V到265V全范围输入电压非隔离LED恒流电源。芯片采用自供电结构，无需辅助绕组，或者其他辅助供电方式，用于驱动NPN三极管，提供高性价比。芯片内部集成的抖频功能可降低EMI成本，内置环路补偿与斜坡补偿，无需外部补偿，应用设计简单。利的高端电流检测、固定频率、电流模PWM控制方式，具有异的线性调整率和负载调整率。AP7112具有多重保护功能，包括逐周期限流保护，LED开路、短路保护，输入供电欠压保护及电源箝位等功能。AP7112采用SOP8封装。特点 自供电结构，无需辅助供电 LED均值电流控制，恒流效果好 LED输出电流精度：±3% ：高可达93%以上 电流模PWM控制 固定工作频率 抖频功能 内置环路补偿、斜坡补偿 LED开路、短路保护 芯片供电欠压保护应用领域 LED球泡灯、日光灯 其它LED照明 AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358封装及管脚分配1458VSSSWDRVVDDRDVSPVSNOVPSOP8 AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358管脚描述管脚号 管脚名 管脚类型 描述1 VSS 地 电源地2 SW 输出 内置 MOS 漏极，接 NPN 发射极3 DRV 输出 NPN 三极管极驱动端4 VDD 电源 芯片电源5 OVP 输入 LED 过压检测端6 VSN 输入 接电流采样电阻负电位端7 VSP 输入 接电流采样电阻正电位端8 RD 输入 外接电阻，设置 DRV 驱动电流内部电路方框图电流检测1.3VOSC斜坡补偿频率抖动PWM逻辑UVLOOVPLEBBG1.3VDRV驱动电流设置VDDRDDRVSWOVPVSSVSPVSNAP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358极限参数（注1）类型符号描述小值大值单位电压VMAX所有管脚上高电压-0.36V电流IDD_MAXVDD引脚大电源电流15mAISWSW引脚大电流800mA功耗PSOP8SOP8封装的大功耗0.75W温度TJ结温范围-20125PPPPoCTA工作温度-2085PPPPoCTSTG存储温度-40125PPPPoCTSD焊接温度范围（时间少于30秒）240PPPPoCESDVESD静电耐压值（人体模型）2000V注1：超过上表中规定的极限参数会导致器件性损坏。而工作在以上极限条件下可能会影响器件的可靠性。 电气特性 除非特别说明，TA =25oC参数符号测试条件小值典型值大值单位电源电压工作电压VDD5V启动电压阈值VDD_ONVDD上升4.855.2V欠压保护阈值VDD_UVLOVDD下降3.844.2V箝位电压VDD_CLAMP5.5V电源电流启动电流ISTARTUPVDD =4V40uA静态电流ISTANDBYVOVP =5V1.1mA AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358电气特性(接上一页) 除非特别说明，TA =25 oC参数符号测试条件小值典型值大值单位电感电流采样电流检测电阻 两端电压均值VSEN194200206mV限流值VSEN_LMT520mV前沿消隐时间TLEB350nsOSC工作频率典型工作频率FOSC65KHz抖频范围ΔFOSC-33%输出驱动RD电压VRD1.2251.31.345VDRV驱动电流IDRVRSET =68K30mADRV下拉电流IDRV_SD0.过压保护OVP过压保护阈值VOVP_TH1.3VOVP箝位电压VOVP_CLAMPIOVP =2mA5.7VIOVP = -2mA-0.7V内置低压MOS管导通电阻RDSON0.5ΩAP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358典型特性曲线除非特别说明，TA =25 oC AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358应用指南概述AP7112是具有自供电功能的高精度降压型大功率LED恒流驱动芯片。 AP7112采用自供电电路，无需辅助绕组；采用利的高端电流检测、固定频率、电流模PWM控制方式，具有异的线性调整率和负载调整率。 AP7112内置了频率补偿与斜坡补偿，无需外部补偿；集成了抖频功能，以改善系统的EMI特性； AP7112还集成了LED开路、短路保护，逐周期限流保护，输入供电欠压保护及电源箝位等功能。典型应用电路AP7112的典型应用电路有两种：一种是无输出电容的，如图1所示；另一种是带输出电容的，如图2所示。 当采用无输出电容的方案时，系统工作在连续模式，当采用带输出电容的方案时，系统既可以工作在连续模式也可以工作在非连续模式。芯片启动系统上电后通过启动电阻对连接于电源引脚VDD的电容充电，芯片处于欠压保护状态时芯片消耗的电流约40uA。 当电源电压高过开启阈值VDD_ON时，芯片控制电路开始工作，自供电电路也开始工作并给芯片供电。 芯片内置了5.5V的箝位电路，用于箝位VDD电压。LED工作电流设定LED电流由接在VSP与VSN引脚之间的电阻RCS设置： SENLEDCSVIR= 其中，VSEN的典型值为200mV。驱动电流设置AP7112是通过连接于RD引脚的电阻RSET来设置外接NPN的极驱动电流的。RD引脚上的电压典型值为1.3V。极驱动电流一般需要根据LED工作电流的大小设定，当设置RSET 为68KΩ时，DRV驱动电流约为30mA，对应的LED工作电流在六七百毫安左右，需要更大工作电流时则按比例减小RSET，反之则反。极驱动电流可由下式确定： 2100DRVSETIR= (mA)开路保护AP7112通过连接于OVP引脚的电阻R1和R2来设置LED开路保护电压。OVP引脚的开路保护电压阈值为1.3V。LED开路保护电压由下式设置： 12_1OVPOVPTHRRVVR+=∗ 且1250500OVPVuAuARR<<+ 芯片在功率管关断期间检测LED两端电压，一般设定VOVP为输出电压VLED的1.2倍。当LED两端电压达到开路保护值时，芯片关断驱动端，直至VDD引脚出现欠压保护，芯片重启，重新检测。短路保护当出现LED短路时，系统会降低工作频率从而减小输入电流。系统开关频率下降到一定值时芯片可能进入电源欠压保护状态，从而触发芯片重新启动。 AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358电感选择在输入电压、输出电压以及输出电流已定的条件下，电感值决定了电感电流纹波大小以及连续或非连续工作模式。工作于临界模式时的电感值为： *()2**LEDVoViVoLcriViIfs−= 电感取值在上式附近，可得到较化的效率。当采用无输出电容的方案时，应选择稍大的电感值，以使得电感电流工作在连续模式，减小LED上的电流纹波。当LED两端并联有输出电容时，系统既能工作在连续模式也能工作在非连续模式。VDD旁路电容连接在芯片VDD引脚的旁路电容应选择低ESR电容，以保芯片可靠稳定工作和VDD电源纹波小，推荐使用2.2~10uF温度特性好的陶瓷电容。由于低温时电容 的ESR成倍增加，为避免低温启动困难，可在VDD引脚多并联一个约1uF的瓷片电容或者独石电容。PCB设计在设计PCB时应遵循以下准则： VDD的旁路电容需要紧靠芯片的VDD和VSS引脚。 引脚VSP需要用单独的地线连接至电流采样电阻的一端。芯片地以及其他地应分头接到旁路电容的地端。 走线上应特别注意：连接到VIN的电压母线走线、电感到输出LED灯的走线、输出LED灯的地线走线等高压走线应避免与IC距离太近，并且避免与从IC出来的相对低压的线平行走线，如图1、图2中粗线所示。 减小功率环路的面积，以减小EMI辐射。 AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358DRVVSNVSPOVPVSSRDVDDAP7112SWRCSRSETVinACVIN 图1：AP7112典型应用电路图1（无输出电容） DRVVSNVSPOVPVSSRDVDDAP7112SWRCSRSETR1R2VinACVIN图2：AP7112典型应用电路图2（带输出电容） AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358封装信息 SOP8封装尺寸图： AP7112SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司 0755-86248636/29977358No MOET, Sense Resistor or BlockingDiode RequiredComplete Linear Charger Package forSingle Cell Lithium-Ion BatteriesConstant-Current/Constant-VoltageOperation with Thermal Regulation toMaximize Charge Rate Without Risk ofOverheatingCharges Single Cell Li-Ion Batteries Directlyfrom USB PortPreset 4.2V Charge Voltage with 1%AccuracyAutomatic Recharge60uA Supply Current in Shutdown2.9V Trickle Charge ThresholdTwo sides of LED showingAvailable in 6-Lead SOT-23 PackageApplicationsCharger for Li-Ion Coin Cell BatteriesPortable MP3 Players, Wireless HeadsetsBluetooth ApplicationsMultifunction WristwatchesThe AP6302 is a complete constant-current/constant voltage linear charger for single celllithium-ion batteries. Its package and low externalcomponent count make the AP6302 ideallysuited for portable applications. Furthermore, theAP6302 is specifically designed to work withinUSB power external sense resistor is needed, and noblocking diode is required due to the internalMOET architecture. Thermal feedbackregulates the charge current to limit the dietemperature during high power operation or highambient temperature. The charge voltage is fixedat 4.2V, and the charge current can beprogrammed externally with a single resistor. TheAP6302 automatically terminates the chargecycle when the charge current drops to 1/10th theprogrammed value after the final float voltage the input supply (wall adapter or USBsupply) is removed, the AP6302 automaticallyenters a low current state, dropping the batterydrain current to less than 1uA. The AP6302 canbe put into shutdown mode, reducing the supplycurrent to 60uA. Other features include chargecurrent monitor, under voltage lockout, automaticrecharge and a status pin to indicate chargetermination and the presence of an input AP6302 converters are available in theindustry standard SOT-23-6 power packages(or upon request).AP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358Typical ApplicationAP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358Pin AssignmentSOT-23- 6Absolute Maximum RatingsInput Supply Voltage (VCC) .......................................................................................... –0.3V to 10VPROG............................................................................................................... – 0.3V to VCC + 03VBAT ........................................................................................................................... –0.3V to 8VCHRG..................................................................................................................... –0.3V to 10VBAT Short-Circuit Duration …………………………….................................................. ContinuousBAT Pin Current ................................................................................................................... 800mAPROG Pin Current ................................................................................................................ 800uAMaximum Junction Temperature .............................................................................. 125℃Operating Ambient Temperature Range............................................................... –40℃to 85℃Storage Temperature Range ………………………………………….................. –65℃to 125℃Lead Temperature (Soldering, 10 sec).................................................................................. 300℃PINNUMBERSOT-23- 6PIN NAME FUNCTION1 CHRGOpen-Drain Charge StatusOutput2 GND Ground3 BAT Charge Current Output4 VCCPositive Input SupplyVoltage.5 LDOpen-Drain Charge StatusOutput6 PROGCharge Current Program,Charge Current Monitorand Shutdown Pin1 2 36 5 4AP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358Electrical CharacteristicsOperating Conditions: TA=25 ,℃VCC=5V unless otherwise PARAMETER CONDITIONS MIN TYP MAX UNITSVCC Input Supply Voltage 4.5 5.0 6.5 VICCInput Supply CurrentCharge Mode , RPROG = 10kStandby Mode (ChargeTerminated) lShutdown Mode (RPROG NotConnected, VCC < VBAT, or VCC <VUV)704565μAμAμAVFLOATRegulated Output(Float) Voltage0℃≤TA≤85℃, IBAT = 40mA 4.15 4.2 4.24 VIBAT BAT Pin CurrentRPROG = 10k, Current ModeRPROG = 2k, Current ModeStandby Mode, VBAT = 4.2VShutdown Mode (RPROG NotConnected)Sleep Mode, VCC = 0V83410894457.37.20.397470151mAmAμAμAμAITRIKL Trickle Charge Current VBAT < VTRIKL, RPROG = 2k 15 39 65 mAVASDVCC – VBAT LockoutThreshold VoltageVCC from Low to HighVCC from High to Low518mVITERMC/10 TerminationCurrent ThresholdRPROG = 2k45mAVPROG PROG Pin Voltage RPROG = 10k, Current Mode 0.94 1.02 1.08 VRON EfficiencyPower FET “ON” Resistance(Between VCC and BAT) 660 mAP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358Application InformationCHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulledlow by an internal N-channel MOET. When the charge cycle is completed, high impedance is forcedto the CHRG pin and LD (pin 5) is pulled low, indicating an “AC present” condition. When the AP6302detects an reverse battery (VBAT>VCC) lockout or no AC condition, Both CHRG and LD are forced (Pin 2): (Pin 3): Charge Current Output. It should be bypassed with at least a 1uF capacitor. It Providescharge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistordivider from this pin sets the float voltage which is disconnected in shutdown (Pin 4): Positive Input Supply Voltage. It provides power to the charger. VCC can range from4.25V to 6.5V and should be bypassed with at least a 1uF capacitor. When VCC drops to within 30mVof the BAT pin voltage, the AP6302 enters shutdown mode, dropping IBAT to less than 2 (Pin 5): Open-Drain Charge Status Output. See CHRG pin (Pin 1).PROG (Pin 6): Charge Current Program, Charge Current Monitor and Shutdown Pin. The chargecurrent is programmed by connecting a 1% resistor, RPROG, to ground. When charging inconstant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used tomeasure the charge current using the following formula: IBAT = (VPROG/RPROG)*890, The PROG pincan also be used to shut down the charger. Disconnecting the program resistor from ground allows aweak current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, thecharger enters shutdown mode, charging stops and the input supply current drops to 65uA.Reconnecting RPROG to ground will return the charger to .normal operation.AP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358Packaging InformationSOT-23-6 Package Outline DimensionDimensions In Millimeters Dimensions In InchesSymbolMin Max Min MaxA 1.050 1.250 0.041 0.049A1 0.000 0.100 0.000 0.004A2 1.050 1.150 0.041 0.045b 0.300 0.500 0.012 0.020c 0.100 0.200 0.004 0.008D 2.820 3.020 0.111 0.119E 1.500 1.700 0.059 0.067E1 2.650 2.950 0.104 0.116e 0.950(BSC) 0.037(BSC)e1 1.800 2.000 0.071 0.079L 0.300 0.600 0.012 0.024AP6302SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司0755-86248636/29977358
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