Buck(降压)变换器简介_MPS Training For Coship

1、 The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology LNB Supply 13V-18V Demodulator Satellite AC/DC DC/DC DC/DC DC/DC DC/DC DC/DC Stereo DAC HDMI PC Card Flash Memory Ethernet Controller ROM Tuner DDR RAM Digital Media Processor Micro Controller F

2、ront Control Panel MP1484 MP1482 MP1482 MP1482 MP1484 MP9415 5V 24V 3.3V 2.5V 1.8V 1.2V/1.05V MP2374/MP8125 Universal AC RS232Smart CardVCR USB USB Switch MP62055 12V Dying Gasp MP200USB Host 3.3V,1.2V LNB LDO MP8802 5V3.3V 5V, 3.3V The 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

3、关频率 2128同步Buck2.5-60.60.6-513MHz 2259非同步Buck4.5-160.80.8-1411.4MHz 2374非同步Buck6.5-321.231.23-211330kHz 1411非同步Buck4.75-180.920.92-162380kHz 1482同步Buck4.75-180.920.92-152340kHz 1582非同步Buck4.5-280.80.8-252500kHz-1.5MHz 2212同步Buck3-16V0.80.8-143600kHz 1484同步Buck4.75-180.920.92-153340kHz 2307同步Buck4.75-

4、230.920.92-203340kHz 1423非同步Buck6-23V1.221.22-213385kHz 9415同步Buck4.5-160.80.8-145500k 1541升压Boost2.5-61.2525V max/1.3MHz The 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 Vo

5、T onVin offon onVin DVinVo T on D，则令 The Future of Analog IC Technology The Future of Analog IC Technology The Future of Analog IC Technology t1t4 Top Gate Drive Bottom Gate Drive Top Switch Current Bottom Switch Current Bottom Diode Current Bottom Channel Current Switch Node Voltage Inductor Curren

6、t t0t2t3t5t7t6t8t9 t t Co Vin L1 M1 Vo M2 Cin GND SN The Future of Analog IC Technology V dt di L VoVin ton I L VoVin TVinVo Io L )/( )%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

7、% -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 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

8、 The Future of Analog IC Technology 1 2 3 4 5 1 2 3 4 5 6 6 The 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 The Future of Analog IC Technology RsCs 推荐值4.71001001000pF The Fu

9、ture 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 Analog IC Technology The Future of Analog IC Technology Adaptive COT Mode Low RDS(ON) Internal Power MOSFETs Wide 3V to 16V Operating Input R

10、ange Fast transient response The MP1492 is a fully integrated, highefficiency 2A synchronous rectified step-down converter. The MP1492 operates at high efficiency over a wide output current load range because of adaptive Constant-On-Time (COT) control mode. Digital Set Top Boxes Flat Panel Televisio

11、n and Monitors Distributed Power Systems Top high light load efficiency High full load efficiency curve Available for 3.3V,5V,12V,15V input voltage Small output capacitor for low cost 2A Output Current Proprietary Switching Loss Reduction Technique Programmable Switching Frequency OCP, SCP, OVP, UVP Protection Compatible with 0.5W standby require