Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.01特点n8V到36V宽输入电压范围n输出电压从1.25V到32V可调n最小压差0.3Vn固定150KHz开关频率n最大5A开关电流n内置功率MOSn出色的线性与负载调整率n内置恒流环路n内置频率补偿功能n内置输出短路保护功能n内置输入过压保护功能n内置热关断功能nTO263-5L封装应用n车载充电器n电池充电器nLCD电视与显示屏n便携式设备供电n通讯设备供电n降压恒流驱动n显示器LED背光n通用LED照明描述XL4501是一款高效降压型DC-DC转换器,可工作在DC8V到36V输入电压范围,低纹波,内置功率MOS。XL4501内置固定频率振荡器与频率补偿电路,简化了电路设计。PWM控制环路可以调节占空比从0~100%之间线性变化。内置输出过电流保护功能。内部补偿模块可以减少外围元器件数量。图1.XL4501封装Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.02引脚配置图2.XL4501引脚配置表1.引脚说明引脚号引脚名称引脚描述1GND接地引脚。2FB反馈引脚,通过外部电阻分压网络,检测输出电压进行调整,参考电压为1.25V。3SW功率开关输出引脚,SW是输出功率的开关节点。4CS输出电流检测引脚(IOUT=0.11V/RCS)。5VIN输入电压,支持DC8V~36V宽范围电压操作,需要在VIN与GND之间并联电解电容以消除噪声。Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.03方框图图3.XL4501方框图典型应用图4.XL4501系统参数测量电路Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.04典型应用(降压LED恒流驱动)XL4501CIN220uF/50VCOUT330uF/50VR21%R13K1%C1105C21055342VIN8V~36VVINSWCSFBGND1L1100uH/5AD1MBRD1045RCS0.33Ω1%ILED=0.11V/RCSLEDOVP=1.3*VOUT=1.3*{1.25*(1+R2/R1)}图5.XL4501系统参数测量电路(LED恒流驱动)订购信息产品型号打印名称封装方式包装类型XL4501E1XL4501E1TO263-5L800只每卷XLSEMI无铅产品,产品型号带有“E1”后缀的符合RoHS标准。绝对最大额定值(注1)参数符号值单位输入电压Vin-0.3到40V反馈引脚电压VFB-0.3到40V输出开关引脚电压VSW-0.3到VINV功耗PD内部限制mW热阻(TO263-5L)(结到环境,无外部散热片)RJA30ºC/W最大结温TJ-40到150ºC操作结温TJ-40到125ºC贮存温度范围TSTG-65到150ºC引脚温度(焊接10秒)TLEAD260ºCESD(人体模型)2000V注1:超过绝对最大额定值可能导致芯片永久性损坏,在上述或者其他未标明的条件下只做功能操作,在绝对最大额定值条件下长时间工作可能会影响芯片的寿命。Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.05XL4501电气特性Ta=25℃;除非特别说明。符号参数条件最小值典型值最大值单位图4的系统参数测量电路VFB反馈电压Vin=8V到36V,Vout=5VIload=0.2A到4A1.2311.2501.269Vŋ效率Vin=12V,Vout=5VIout=4A-86-%电气特性(直流参数)Vin=12V,GND=0V,Vin与GND之间并联100uF/50V电容;Iout=500mA,Ta=25℃;其他任意,除非特别说明。参数符号条件最小值典型值最大值单位输入电压Vin836V输入欠压保护Vin_uvlo5V静态电源电流IqVFB=2V25mA振荡频率FOSC127150172KHz开关电流限值ILVFB=07A输出功率MOSRdsonVFB=0V,Vin=12V,ISW=5A75100mohm恒流采样电压VCS104.5110115.5mVDatasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.06系统典型应用(车载充电)图6.XL4501系统参数测量电路(VIN=8V~36V,VOUT=5V/0.1A~4.2A)0.00.51.01.52.02.53.03.54.04.50.00.51.01.52.02.53.03.54.04.55.05.5OutputvoltageVSOutputcurrentOutputvoltage(V)Outputcurrent(A)VIN=8V,VOUT=5V,IOUT=0.1A~4.2AVIN=12V,VOUT=5V,IOUT=0.1A~4.2AVIN=24V,VOUT=5V,IOUT=0.1A~4.2AVIN=36V,VOUT=5V,IOUT=0.1A~4.2A0.00.20.40.60.81.01.21.41.61.82.02.22.42.62.83.03.23.43.63.84.0404550556065707580859095100EfficiencyVSOutputcurrentEfficiency(%)Outputcurrent(A)VIN=8V,VOUT=5V,IOUT=0.1A~4AVIN=12V,VOUT=5V,IOUT=0.1A~4AVIN=24V,VOUT=5V,IOUT=0.1A~4AVIN=36V,VOUT=5V,IOUT=0.1A~4A图7.输出恒流曲线图8.效率曲线0.00.20.40.60.81.01.21.41.61.82.02.22.42.62.83.03.23.43.63.84.04.74.84.95.05.15.25.3OutputvoltageVSOutputcurrentOutputvoltage(V)Outputcurrent(A)VIN=8V,VOUT=5V,IOUT=0.1A~4AVIN=12V,VOUT=5V,IOUT=0.1A~4AVIN=24V,VOUT=5V,IOUT=0.1A~4AVIN=36V,VOUT=5V,IOUT=0.1A~4A-50-250255075100125-10-8-6-4-20246810FREQUENCYCHANGEVSTEMPERATUREFREQUENCYCHANGE(%)TEMPERATURE(℃)VIN=12V,VOUT=5V,IOUT=1.0ANormalizedatTA=25℃图9.线性与负载调整率图10.频率变化曲线Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.07-50-250255075100125-3.0-2.5-2.0-1.5-1.0-0.50.00.51.01.52.02.53.0FEEDBACKVOLTAGECHANGEVSTEMPERATUREFEEDBACKVOLTAGECHANGE(%)TEMPERATURE(℃)VIN=12V,VOUT=5V,IOUT=1.0ANormalizedatTA=25℃NOTE2图11.反馈电压变化曲线注2:内部温度补偿电路可补偿PCB和系统应用的外部线路损耗。当结温或输出功率上升,反馈电压会得到补偿。此功能是专为补偿PCB和外部线路损耗设计。Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.08典型应用(LED应用推荐输出电压安全工作范围)81012141618202224262830323436024681012141618202224262830323436RecommendoutputvoltagesafeworkrangeOuputvoltage(V)Inputvoltage(V)IOUT=330mA81012141618202224262830323436024681012141618202224262830323436RecommendoutputvoltagesafeworkrangeOuputvoltage(V)Inputvoltage(V)IOUT=660mA图12.最大输出电压(IOUT=330mA)图13.最大输出电压(IOUT=660mA)81012141618202224262830323436024681012141618202224262830323436RecommendoutputvoltagesafeworkrangeOutputvoltage(V)Inputvoltage(V)IOUT=1000mA81012141618202224262830323436024681012141618202224262830RecommendoutputvoltagesafeworkrangeOutputvoltage(V)Inputvoltage(V)IOUT=2000mA图14.最大输出电压(IOUT=1000mA)图15.最大输出电压(IOUT=2000mA)81012141618202224262830323436024681012141618202224RecommendoutputvoltagesafeworkrangeOutputvoltage(V)Inputvoltage(V)IOUT=3000mA8101214161820222426283032343602468101214161820RecommendoutputvoltagesafeworkrangeOutputvoltage(V)Inputvoltage(V)IOUT=4000mA图16.最大输出电压(IOUT=3000mA)图17.最大输出电压(IOUT=4000mA)Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.09系统典型应用图18.XL4501系统参数测量电路(VIN=15V~36V,VOUT=12V)0.00.20.40.60.81.01.21.41.61.82.02.22.42.62.83.03.23.43.63.84.0404550556065707580859095100EfficiencyVSOutputcurrentEfficiency(%)Outputcurrent(A)VIN=15V,VOUT=12V,IOUT=0.1A~4AVIN=24V,VOUT=12V,IOUT=0.1A~4AVIN=36V,VOUT=12V,IOUT=0.1A~4A图19.XL4501系统效率曲线Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.010系统典型应用(VIN=8V~36V,IOUT=330mA)图20.XL4501系统参数测量电路(VIN=8V~36V,IOUT=330mA)12345678910404550556065707580859095100EfficiencyVSLEDStringEfficiency(%)LEDString(N*1W)VIN=8V,IOUT=330mAVIN=12V,IOUT=330mAVIN=24V,IOUT=330mAVIN=36V,IOUT=330mA图21.XL4501系统效率曲线Datasheet150KHz36V5A开关电流自带恒流环路降压型DC-DC转换器XL4501Rev1.011典型系统应用(VIN=8V~36V,IOUT=660mA)图22.XL4501系统参数测量电路(VIN=8V~36V,IOUT=660mA)12345678910404550556065707580859095100EfficiencyVSLEDStringEfficiency