Vicor 公司的PI2125是30V 12A全功能Active ORing解决方案,集成了高速ORing MOSFET控制器和非常低的导通电阻(5.5mΩ)的MOSFET器件,主要用在N+1冗余电源系统,服务器和高端计算设备,通信系统以及高边大电流(12A)Active ORing.本文介绍了PI 2125的主要性能,内部方框图,应用电路图以及PI2125-EVAL2评估板电路图和材料清单(BOM).

PI 2125 30 Volt, 12 Amp Full-Function Active ORing Solution

The Cool-ORing PI2125 is a complete full-function Active ORing solution with a high-speed ORing MOSFET controller and a very low on-state resistance MOSFET designed for use in redundant power system architectures. The PI2125 Cool-ORing solution is offered in an extremely small, thermally enhanced 5mm x 7mm LGA package and can be used in high side Active ORing applications on bus voltages up to 12V. The PI2125 enables extremely low power loss with fast dynamic response to fault conditions, critical for high availability systems. A master/slave feature allows the paralleling of PI2125 solutions for high current Active ORing requirements.

The PI2125, with its 5.5mΩ internal MOSFET provides very high efficiency and low power loss during steady state operation, while achieving high-speed turn-off of the internal MOSFET during input power source fault conditions that cause reverse current flow. The PI2125 provides an active low fault flag output to the system during excessive forward current, light load, reverse current, over-voltage, under-voltage and over-temperature fault conditions. A temperature sensing function indicates a fault if the maximum junction temperature exceeds 160°C. The under-voltage and over-voltage thresholds are programmable via an external resistor divider.

PI 2125主要特性:

Integrated High Performance 12A, 5.5mΩ MOSFET

Very-small, high density fully-optimized solution providing simple PCB layout.

Fast Dynamic Response to Power Source failures, with 160ns reverse current turn-off delay time

Accurate sensing capability to indicate system fault conditions

Programmable under & over-voltage functions

Over temperature fault detection

Adjustable reverse current blanking timer

Master/Slave I/O for paralleling

Active low fault flag output

PI 2125应用:

N+1 Redundant Power Systems

Servers & High End Computing

Telecom Systems

High-side Active ORing

High current Active ORing ( ≤ 12Vbus)

图1.PI 2125内部方框图

图2.PI2125 12V 浮置Active ORing应用电路图

PI2125-EVAL2评估板

The PI2125-EVAL2 allows the user to test the basic principle and operational characteristics of an Active ORing function in a redundant power architecture, while also experiencing the benefits and value of the PI2125 solution versus conventional Active ORing solutions. The PI2125-EVAL2 evaluation board is configured to receive two independent power source inputs, per a typical redundant power architecture, through two

Active ORing channels that are combined to form a redundant power output. Each channel is capable of up to 12 A, and is suitable for redundant bus voltages up to 12 V.

For high current Active ORing, above 12 A, the two channels provided on the evaluation board can be paralleled in a master/slave configuration and OR’d with a second

evaluation board.

The PI2125-EVAL2 evaluation board is designed with optimized PCB layout and component placement to represent a realistic high density final design for an embedded Active ORing solution for ≤ 12 Vbus applications requiring up to 12 A. This evaluation board is intended as an easy and simple way to test the electrical and thermal performance of the PI2125 Full-Function Active ORing solution.

Both dynamic and steady state testing of the PI2125 can be completed on the PI2125-EVAL2 evaluation board, in addition to using the key features of the product. Dynamic testing can be completed under a variety of system level fault conditions to check for response time to faults.

图3. PI2125-EVAL2评估板外形图

图4. PI2125-EVAL2评估板电路图

表1. PI2125-EVAL2评估板材料清单(BOM):

详情请见:

http://www.vicorpower.com/picorpower/data_sheets/ds_pi2125.pdf

和

http://www.vicorpower.com/picorpower/data_sheets/ug_PI2125EvlBrd.pdf