原标题：NXP TEA1995TGreenChip同步整流(SR)电源解决方案

　　nxp公司的TEA1995T是新一代同步整流(SR)控制器GreenChip,集成了自适应栅极驱动以在任何负载下效率最大化,包括有驱动SR MOSFET的两个驱动级,电源电压4.5 V到38 V,节能状态下的工作电流小于200uA,主要用在适配器,台式PC电源,电视机电源和服务器电源.本文介绍了TEA1995T主要特性和优势,框图,应用电路图和评估板TEA1995DB1294主要特性,电路图,材料清单和PCB布局图.

　　The TEA1995T is the first product of a new generation of Synchronous Rectifier (SR)controller ICs for switched mode power supplies. It incorporates an adaptive gate rive method for maximum efficiency at any load.

　　The TEA1995T is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters. It has two driver stages for driving the SR MOSFETs, which rectify the outputs of the central tap secondary transformer windings. The two gate driver stages have their own sensing inputs and operate independently.

　　The TEA1995T can also be used in multi-output flyback converters with the SR MOSFET placed at the low side.

　　The TEA1995T is fabricated in a Silicon-On-Insulator (SOI) process.

　　TEA1995T主要特性和优势:

　　1.效率特性:

　　 Adaptive gate drive for maximum efficiency at any load

　　 Supply current in energy save operation below 200 uA

　　2.应用特性:

　　 Wide supply voltage range from 4.5 V to 38 V

　　 Dual synchronous rectification for LLC resonant in SO8 package

　　 Synchronous rectification for multi-output flyback converters

　　 Supports 5 V operation with logic level SR MOSFETs

　　 Differential inputs for sensing the drain and source voltages of each SR MOSFET

　　3.控制特性:

　　 SR control without minimum on-time

　　 Adaptive gate drive for fast turn-off at the end of conduction

　　 UnderVoltageLockOut (UVLO) protection with active gate pull-down

　　TEA1995T应用:

　　The TEA1995T is intended for resonant power supplies. In such applications, it can drive two external synchronous rectifier MOSFETs for the rectification of the voltages on the twosecondary windings of the transformer. These MOSFETs replace diodes. It can be used inall power supplies requiring high efficiency:

　　 Adapters

　　 Power supplies for desktop PC and all-in-one PC

　　 Power supplies for television

　　 Power supplies for servers

　　图1.TEA1995T框图

　　图2.TEA1995T典型谐振应用

　　图3.TEA1995T多输出反激应用

　　评估板TEA1995DB1294

　　This user manual describes how the TEA1995DB1294 demo board can beused in a resonant converter. The demo board contains a TEA1995T SRcontroller in an SO8 package. In addition to the TEA1995T, the demoboard contains two power MOSFETs. The demo board replaces thesecondary side of the resonant converter, excluding the output capacitorsand the feedback hardware. There are two versions of the demo board available. A version containing TO-220 MOSFETs (UM10891), and asecond version using LFPAK MOSFETs (UM10892).

　　The TEA1995DB1294 demo board contains the secondary partof a single output LLC converter, excluding the output capacitors and the feedback controlhardware. To use the TEA1995DB1294 demo board correctly, an LLC converter board inwhich the demo board can replace the secondary part, is required.

　　评估板TEA1995DB1294特性:

　　• Adaptive gate drive for maximum efficiency at any load

　　• Supply current in no-load operation below 200uA

　　• Wide supply voltage range from 4.5 V to 38 V

　　• Dual synchronous rectification for LLC resonant in SO8 package

　　• Synchronous rectification for multi-output flyback converters

　　• Supports 5 V operation with logic level SR MOSFETs

　　• Differential inputs for sensing the drain and source voltages of each SR MOSFET

　　• SR control without minimum on-time

　　• Adaptive gate drive for fast turn-off at the end of conduction

　　• UnderVoltageLockOut (UVLO) with active gate pull-down

　　图4.评估板TEA1995DB1294外形图

　　图5.评估板TEA1995DB1294配置图

　　图6.评估板TEA1995DB1294电路图

　　评估板TEA1995DB1294材料清单:

　　图7.评估板TEA1995DB1294 PCB布局图