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| Vicor PI2002高速Active ORing方案 | |||||
作者：Vicor 文章来源：Vicor 点击数： 更新时间：2008-10-9  |
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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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