基于SiC414設計的6A降壓電源穩壓技術(shù)

基于SiC414設計的6A降壓電源穩壓技術(shù)

SiC414是Vishay公司的集成了5V/200mA LDO的6A降壓電源穩壓器,開(kāi)關(guān)頻率高達1MHz,全部采用陶瓷電容.連續輸出電流達6A,效率大于95%,內部軟起動(dòng)和軟關(guān)斷,主要用在筆記本電腦,臺式電腦和服務(wù)器,數字HDTV和消費類(lèi)電子,網(wǎng)絡(luò )和通信設備,打印機,DSL和STB,嵌入式應用和點(diǎn)負載電源.本文介紹了SiC414主要特性, 功能方框圖, 典型應用電路圖和SiC414評估板電路圖以及材料清單(BOM).

SiC414 pdf:http://www.elecfans.com/soft/39/2010/2010032371827.html

The Vishay Siliconix SiC414 is an advanced stand-alone synchronous buck regulator featuring integrated power MOSFETs, bootstrap diode, and an internal 5 V LDO in a space-saving MLPQ 4 x 4 - 28 pin package.

The SiC414 is capable of operating with all ceramic solutions and switching frequencies up to 1 MHz. The programmable frequency, synchronous operation and selectable power-save allow operation at high efficiency across the full range of load current. The internal LDO may be used to supply 5 V for the gate drive circuits or it may be bypassed with an external 5 V for optimum efficiency and used to drive external n-channel MOSFETs or other loads. Additional features include cycle-by-cycle current limit, voltage softstart, under-voltage protection, programmable over-current protection, soft shutdown and selectable power-save. The Vishay Siliconix SiC414 also provides an enable input and a power good output.

SiC414主要特性:

? High efficiency > 95 %

? 6 A continuous output current capability

? Integrated bootstrap switch

? Integrated 5 V/200 mA LDO with bypass logic

? Temperature compensated current limit

? Pseudo fixed-frequency adaptive on-time control

? All ceramic solution enabled

? Programmable input UVLO threshold

? Independent enable pin for switcher and LDO

? Selectable ultra-sonic power-save mode

? Internal soft-start and soft-shutdown

? 1 % internal reference voltage

? Power good output and over voltage protection

? Halogen-free according to IEC 61249-2-21 definition

? Compliant to RoHS directive 2002/95/EC

SiC414應用:

? Notebook, desktop and server computers

? Digital HDTV and digital consumer applications

? Networking and telecommunication equipment

? Printers, DSL and STB applications

? Embedded applications

? Point of load power supplies

圖1.SiC414功能方框圖

圖2.SiC414典型應用電路圖

圖3.SiC414評估板電路圖

SiC414評估板材料清單(BOM):



圖4.SiC414評估板PCB布局圖(頂層)