原标题：Vicor PI3101 Cool-Power 60W直流电源解决方案

　　Vicor公司的PI3101是Cool-Power系列60W非常高密度的隔离式DC/DC转换器(400W/in3),输入电压36V-75V,输出3.3V / 18A,和通常的解决方案相比,空间降低了约50%. PI3101的效率高达87%,输入和输出的绝缘2250V,具有温度监视(TM)和超温保护(OTP),输入UVLO 和OVLO以及输出OVP,过流保护和自动重器起,可调软起动.主要用在PoE,通信,电讯系统和网络电源.本文介绍了PI3101主要特性, 功能方框图和典型应用电路,以及PI3101-EVAL1评估板电路图和材料清单.

　　PI3101:36-75V Input, 3.3V / 18A / 60W Output Very High Density Isolated DC-DC Converter (400W/in3)

　　The Cool-PowerTM PI3101 is a very high density isolated DC-DC converter implementing a high efficiency soft-switching power architecture. The PI3101 operates over a wide range input of 36V to 75Vdc, delivering ~60W of output power (3.3Vout @ 18A), yielding an unprecedented power density of 400W/in3. The PI3101 is available in a space saving surface mountable 0.87” x 0.65” x 0.265” package, achieving ~50% space reduction versus conventional solutions.

　　The switching frequency of 900kHz allows for small input and output filter components which further reduces the total size and cost of the overall system solution. The output voltage is sensed and fed back to the internal controller using a proprietary isolated magnetic feedback scheme which allows for high bandwidth and good common mode noise immunity.

　　The PI3101 requires no external feedback compensation and offers a total solution with a minimum number of external components. A rich feature set is offered, including output voltage trim capability, output over-voltage protection, adjustable soft-start, over-current protection with auto-restart, over and under input voltage lockout and a temperature monitoring and protection function that provides an analog voltage proportional to the die temperature as shut down and alarm capabilities.

　　PI3101主要特性:

　　Efficiency up to 87%

　　High switching frequency minimizes input filter requirements and reduces output capacitance

　　Proprietary “Double-Clamped” ZVS Buck-Boost Topology

　　Proprietary isolated magnetic feedback

　　Small footprint (0.57 in2) enables PCB area savings

　　Very low profile (0.265 in)

　　Wide input voltage range operation (36-75Vdc)

　　On/Off Control, positive logic

　　+10/-10% Trim

　　Temperature Monitor (TM) & Over-Temperature Protection (OTP)

　　Input UVLO & OVLO and output OVP

　　Over current protection with auto restart

　　Adjustable soft-start

　　2250V input to output isolation

　　PI3101应用:

　　Power Over Ethernet (PoE)

　　Communications

　　Telecom Systems

　　Network Power

　　图1.PI3101功能方框图

　　图2.PI3101典型应用电路图

　　PI3101-EVAL1评估板

　　The PI3101-EVAL1 Evaluation Board is intended to acquaint the user with the benefits and features of the Cool-PowerTM Series of advanced, very high density DC-DC power converters. It is not designed or intended to be used in end product applications.

　　Please read this document prior to the connection of test equipment and refer to the product datasheet for device specifications, descriptions and characteristics. Remember to follow good lab safety practices and use safety glasses at all times.

　　The PI3101-EVAL1 evaluation board allows the user to test the basic operating principles of the PI3101 very high density DC-DC power converter and experience the performance and value of this solution compared to alternate conventional solutions. Each evaluation board is populated with the components that could be used in a final design.

　　Additional component footprints are made available to allow the user to test different design configurations that may be required to meet their end needs. The PI3101 EVAL1 is configured to support one single input (36V-75V) and one single output (3.3V@18A). Each board offers pin strap options for trimming the output voltage up and down, turning the converter on and off and adding EMI system “Y” capacitors. Additional parts are included to compensate for line impedance associated with long leads from the bench power supply to the converter. Kelvin type test points are included to allow for easy and convenient connections of testing instruments for evaluation of efficiency, line/load regulation and transient response. A low impedance oscilloscope connection using a Johnson jack is included for ripple measurement and evaluation of the output voltage during transient events. Each demo board is equipped with a heatsink to allow high power operation with a small amount of air flow and to allow operation of the board over various temperature extremes.

　　图3.PI3101-EVAL1评估板外形图

　　图4.PI3101-EVAL1评估板电路图

　　PI3101-EVAL1评估板材料清单(BOM):