| Vicor PI2002高速Active ORing方案 |
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| 作者：未知 来源：Vicor 点击数：117 更新时间：2008-10-9 |
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Vicor 公司的PI2002 Cool-ORing解决方案是高速Active ORing 控制器,具有负载断开特性,以便用在冗余电源系统架构中背对背Nchannel MOSFET. PI2002具有极低的功率损耗和对故障的快速响应特性,具有真正双向开关特性,从而保护了电源和负载. PI2002主要应用在N+1冗余电源系统,服务器和高端计算,通信系统,高边Active ORing以及大电流Active ORing.本文介绍了PI2002的主要特性,方框图, 负载断开的PI2002高边ORing框图以及PI2002-EVAL1评估板电路图与材料清单(BOM).
The PI2002 Cool-ORingTM solution is a high-speed Active ORing controller IC with a load disconnect feature designed for use with back-to-back Nchannel MOSFETs in redundant power system architectures. The PI2002 Cool-ORing controller enables an extremely low power loss solution with fast dynamic response to fault conditions, critical for high availability systems. The PI2002 controls backto-back MOSFETs providing true bi-directional switch capabilities to protect against both power source and load fault conditions.
The gate drive output turns the MOSFETs on in normal steady state operation, while achieving highspeed turn-off during input power source fault conditions, that cause reverse current flow, with auto-reset once the fault clears. The PI2002 has the added benefit of being able to protect against output load fault conditions that may induce excessive forward current and device over-temperature by removing gate drive from the back-to-back MOSFETs with an auto-retry programmable off-time.
The back-to-back MOSFETs drain-to-drain voltage is monitored to detect normal forward, excessive forward, light load and reverse current flow. The PI2002 provides an active low fault flag output to the system during fault condition. A temperature sensing function turns off the MOSFETs and indicates a fault if the junction temperature exceeds
145度C.
PI2002主要特性:
Power Source & Load Fault Protection
Fast Dynamic Response, with 120ns reverse & 150ns forward over-current turn-off delay time
4A gate discharge current
Accurate back-to-back MOSFETs drain-to-drain voltage sensing to indicate system level fault conditions
Programmable under & over-voltage detection
Over temperature fault detection
Programmable over-current Gate off time
Programmable short circuit load detection function
Active low fault flag output
PI2002应用:
N+1 Redundant Power Systems
Servers High End Computing
Telecom Systems
Active ORing with Load Disconnect
High current Active ORing
图1. PI2002方框图
Typical Applications:
图2.负载断开的PI2002高边ORing框图
图3.PI2002 低边开关断开
PI2002-EVAL1评估板
The PI2002-EVAL1 Evaluation Board is intended to acquaint the user with the benefits and features of the Cool-ORingTM PI2002 Active ORing with Load Disconnect solution. It is not designed to be installed in end-use equipment.
图4. PI2002-EVAL1评估板外形图
图5.PI2002-EVAL1评估板电路图
PI2002-EVAL1评估板材料清单(BOM):
详情请见:
http://www.vicorpower.com/picorpower/data_sheets/ds_pi2002.pdf
和
http://www.vicorpower.com/picorpower/data_sheets/ug_PI2002EvlBrd.pdf
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