ST L6727單相PWM控制器應用方案
出處：gyc198215 發(fā)布于：2007-11-12 10:22:32
ST公司的L6726A單相PWM控制器嵌入了大電流驅(qū)動器,很容易就能建立起通用的有極好性能的DC/DC降壓轉(zhuǎn)換器,成本低.輸入電壓從5V到12V,輸出電壓可低至1.5V,可廣泛應用于各種子系統(tǒng)的電源如MCH,IOCH和PCI等,存儲器和端口電源,CPU和DSP電源以及分布式電源等.本文介紹了L6727和L6726A的主要性能,方框圖以及應用電路圖. L6726A Single phase PWM controller The L6726A and L6727 are low-cost single-phase PWM controllers, with embedded high-current drivers, enabling the easy creation of general purpose DC-DC step-down converters with excellent performance for a broad range of applications – from desktop PC sub-systems, such as memories and chipsets, to general-purpose power supplies. With their high level of integration, these compact SO-8 devices allow a significant reduction in the cost and size of the power supply. L6726A is a single-phase step-down controller with integrated high-current drivers that provides complete control logic, protections and reference voltage to realize in an easy and simple way general DC-DC converters by using a compact SO-8 package. Device flexibility allows managing conversions with power input VIN as low as 1.5V and device supply voltage ranging from 5V to 12V. L6726A provides simple control loop with transconductance error amplifier. The integrated 0.8V reference allows regulating output voltage with ±1% accuracy over line and temperature variations. Oscillator is internally fixed to 270kHz. L6726A provides programmable over current protection. Current information is monitored across the Low-Side mosfet RdsON saving the use of expensive and space-consuming sense resistors. FB disconnection protection prevents excessive and dangerous output voltages in case of floating FB pin.  主要特性: ■ Flexible power supply from 5V to 12V ■ Power conversion input as low as 1.5V ■ 1% output voltage accuracy ■ High-current integrated drivers ■ Adjustable output voltage ■ 0.8V internal reference ■ Sensorless and programmable OCP across Low-side RdsON ■ Oscillator internally fixed at 270kHz ■ Programmable soft-start ■ LS-LESS start up ■ Disable function ■ FB disconnection protection ■ SO-8 package 應用范圍: ■ Subsystem power supply (MCH, IOCH, PCI...) ■ Memory and termination Supply ■ CPU & DSP power supply ■ Distributed power supply ■ General DC / DC converters  圖1. L6726A方框圖  圖2. L6726A應用電路圖 |
關(guān)鍵詞：ST L6727單相PWM控制器應用方案L6726AL6727SO-8
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