Buck Regulators與集成輸出跟蹤確保適當(dāng)?shù)膯?dòng)/關(guān)閉電源軌

　　今天的電子系統(tǒng)板需要多個(gè)電源軌電源板上的各種半導(dǎo)體器件和模塊。這些包括ICS，如微處理器，FPGAs，存儲(chǔ)器和其他組件。通常情況下，非隔離點(diǎn)的負(fù)載（DC）降壓穩(wěn)壓器或DC / DC轉(zhuǎn)換器用于生成所需的電壓為這些設(shè)備。隨著工藝尺寸更小的趨勢(shì)，許多這些設(shè)備需要多個(gè)電壓。例如，一個(gè)微處理器可能需要1.2 V或更少的核心和2.5 V或更高的電壓為I / OS。而轉(zhuǎn)換器的輸入電源電壓可能是3.3 V或5 V，同時(shí)提供這些多個(gè)電壓，系統(tǒng)設(shè)計(jì)人員還必須確保電壓是在適當(dāng)?shù)捻樞蛟谏想姾蛿嚯婋A段。如果電源線(xiàn)的順序不正確，可能會(huì)導(dǎo)致過(guò)多的電流牽引或短路，導(dǎo)致設(shè)備故障，并最終系統(tǒng)板，太。

　　因此，為了避免任何潛在的風(fēng)險(xiǎn)，在系統(tǒng)板上的電源線(xiàn)的測(cè)序是至關(guān)重要的。有三種不同類(lèi)型的測(cè)序技術(shù)，即順序、比例，同時(shí)。在應(yīng)用三種排序技術(shù)中的任何一種之前，用戶(hù)應(yīng)該對(duì)每一種方法有一個(gè)基本的了解，并且知道何時(shí)使用一個(gè)與另一個(gè)方法。應(yīng)用筆記1（an04-008），由GE的臨界功率產(chǎn)生和題為“多模塊排序準(zhǔn)則，”提供了幫助，簡(jiǎn)要論述三測(cè)序技術(shù)。

　　Traditionally， designers have been building separate on-board circuits to handle this voltage sequencing problem. It is cumbersome， uses more components and board space and is costly and time consuming. Lately， however， several power supply makers have been incorporating these techniques on-chip or within the module to make the task easier for system designers， GE Critical Power introduced sequencing called EZ-SEQUENCE in power modules such as TLynx and Austin Mega TLynx. It helps users implement any of the three types of sequencing mentioned above2.

　　Now， suppliers like Analog Devices， Intersil， and Texas Instruments， to name three， are integrating the power sequencing technique in new generation of integrated buck converters to make the system designer’s task easier. This article will explore these new buck regulators with integrated sequencing in more detail. What is more， to demonstrate this capability， we will also provide some design examples.