Buck(降压)变换器简介-MPS-Training-For-Coship分析课件.ppt

1、The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology LNB Supply13V-18VDemodulatorSatelliteAC/DCDC/DCDC/DCDC/DCDC/DCDC/DCStereo DACHDMIPC CardFlashMemoryEthernetControllerROMTunerDDRRAMDigitalMedia ProcessorMicroControllerFront Control Panel MP1484

2、MP1482 MP1482 MP1482MP1484MP94155V24V3.3V2.5V1.8V1.2V/1.05V MP2374/MP8125Universal ACRS232Smart CardVCRUSBUSB SwitchMP6205512VDying GaspMP200USB Host3.3V,1.2VLNBLDO MP88025V3.3V5V, 3.3VThe Future of Analog IC Technology 料号调整器类型输入电压FB电压输出电压输出电流开关频率2128同步Buck2.5-60.60.6-513MHz2259非同步Buck4.5-160.80.8-1

3、411.4MHz2374非同步Buck6.5-321.231.23-211330kHz1411非同步Buck4.75-180.920.92-162380kHz1482同步Buck4.75-180.920.92-152340kHz1582非同步Buck4.5-280.80.8-252500kHz-1.5MHz2212同步Buck3-16V0.80.8-143600kHz1484同步Buck4.75-180.920.92-153340kHz2307同步Buck4.75-230.920.92-203340kHz1423非同步Buck6-23V1.221.22-213385kHz9415同步Buck4

4、.5-160.80.8-145500k1541升压Boost2.5-61.2525V max/1.3MHzThe Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology VoTonVinoffononVinDVinVoTonD，则令The Future of Analog IC Technology The Fu

5、ture of Analog IC Technology The Future of Analog IC Technology t1t4Top Gate DriveBottom Gate DriveTop Switch CurrentBottom Switch CurrentBottom Diode CurrentBottom Channel CurrentSwitch Node VoltageInductor Currentt0t2t3t5t7t6t8t9ttCoVinL1M1VoM2CinGNDSNThe Future of Analog IC Technology VdtdiLVoVin

6、tonILVoVinTVinVoIoL)/()%5020(The Future of Analog IC Technology 低温高温容量变化X:-554:+65A:1.0%Y:-305:+85B:1.5%Z:+106:+105C:2.2%7:+125D:3.3%8:+150E:4.7%9:+200F:7.5%P:10%R:15%S:22%T:+22% -33%U:+22% -56%V:+22% -82%The Future of Analog IC Technology 输入电容Bypass电容输出电容电解电容+0.110uF陶瓷电容（X5R）0.011uF电解电容并联+ 0.110uF陶

7、瓷电容（X5R）The Future of Analog IC Technology The Future of Analog IC Technology INVCCEN/SYNCFB/BST/SW/GND输入，输入端的功率由此进入IC输出，VCC为内部逻辑电路、驱动电路供电输入，通过高低电平使IC工作或不工作见后页The Future of Analog IC Technology 123451234566The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC

8、Technology The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology RsCs推荐值4.71001001000pFThe Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology 或或The Future of Analog IC Technology 好好较差较差The Future of

9、Analog IC Technology The Future of Analog IC Technology Adaptive COT ModeLow RDS(ON) Internal Power MOSFETsWide 3V to 16V Operating Input RangeFast transient responseThe MP1492 is a fully integrated, highefficiency 2A synchronous rectified step-down converter. The MP1492 operates at high efficiency

10、over a wide output current load range because of adaptive Constant-On-Time (COT) control mode.Digital Set Top BoxesFlat Panel Television and MonitorsDistributed Power SystemsTop high light load efficiencyHigh full load efficiency curveAvailable for 3.3V,5V,12V,15V input voltageSmall output capacitor

11、 for low cost2A Output CurrentProprietary Switching Loss Reduction TechniqueProgrammable Switching FrequencyOCP, SCP, OVP, UVP Protection Compatible with 0.5W standby requirementsEnable pin functionThermal shutdownInput voltage range 3V-16VOutput Adjustable from 0.805VSOIC8The Future of Analog IC Technology The Future of Analog IC Technology