基于SiC414設計的6A降壓電源穩壓技術-AET-電子技術應用

基于SiC414設計的6A降壓電源穩壓技術

Vishay

摘要： SiC414集成了5V/200mA LDO的6A降壓電源穩壓器,開關頻率高達1MHz,全部采用陶瓷電容.連續輸出電流達6A,效率大于95%,內部軟起動和軟關斷,主要用在筆記本電腦,臺式電腦和服務器,數字HDTV和消費類電子,網絡和通信設備,打印機,DSL和STB,嵌入式應用和點負載電源.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).

關鍵詞： 開關|穩壓穩壓器 HDTV LDO SiC414 Vishay

Abstract：

Key words :

SiC414集成了5V/200mA LDO的6A降壓電源穩壓器,開關頻率高達1MHz,全部采用陶瓷電容.連續輸出電流達6A,效率大于95%,內部軟起動和軟關斷,主要用在筆記本電腦,臺式電腦和服務器,數字HDTV和消費類電子,網絡和通信設備,打印機,DSL和STB,嵌入式應用和點負載電源.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).

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