原标题：ADI ADP1071-1/Couplers®隔离功能反激控制器解决方案

　　ADI公司的ADP1071-1/ADP1071-2是集成了隔离功能和SR驱动器及轻负载模式的反激式控制器,消除了变压器和光耦合器件,降低了系统设计复杂性,成本和元件数量,并提高了系统可靠性.器件集成了误差放大器和优于1%精度基准电压,可编程开关频率50 kHz - 600 kHz,主要用在隔离的DC/DC和AC/DC转换器,通信和工业,小型基站,PoE供电设备,企业交换器和路由器.本文介绍了ADP1071-1 /ADP1071-2主要特性,框图,应用电路图以及评估板ADP1071-1EVALZ和评估板ADP1071-2EBZ3.3V主要特性,电路图,材料清单和PCB设计图.

　　The ADP1071-1/ADP1071-2 are pulse-width modulation (PWM) current mode fixed frequency synchronous flyback controllers designed for isolated dc-to-dc power supplies. Analog Devices proprietary iCouplers® are integrated in the ADP1071-1/ADP1071-2 to eliminate the bulky signal trans-formers and optocouplers that transmit signals over the isolation boundary. Integrating the iCouplers reduces system design complexity, cost, and component count and improves overall system reliability. With the integrated isolators and metal-oxide semiconductor field effect transistor (MOSFET) drivers on both the primary and the secondary side, the ADP1071-1/ADP1071-2 offer a compact system level design and yield a higher efficiency than a diode rectified flyback converter at heavy loads.

　　Output regulation is achieved by sensing the output voltage on the secondary side, where the feedback and the PWM signals are transmitted between the primary and secondary sides through the iCouplers.

　　The ADP1071-1/ADP1071-2 are offered in a 16-lead SOIC_W package with an isolation voltage rating of 5 kV rms. The ADP1071-2 is designed for isolated dc-to-dc applications typically with an input voltage less than 36 V, and the ADP1071-1 targets high input voltage applications, in which the dc input voltage can exceed 60 V.

　　The ADP1071-1/ADP1071-2 offer features such as input current protection, output overvoltage protection (OVP), undervoltage lockout (UVLO), precision enable with adjustable hysteresis, overtemperature protection (OTP), and power saving light load mode (LLM).

　　ADP1071-1/ADP1071-2主要特性:

　　Current mode controller for flyback topology

　　ADP1071-1: programmable LLM or CCM for high VIN applications

　　ADP1071-2: forced CCM operation

　　Programmable slope compensation

　　Integrated 5 kV isolation with Analog Devices, Inc., iCoupler technology

　　Wide voltage supply range

　　Primary VDD: up to 60 V (ADP1071-2 only)

　　Secondary VDD2: up to 36 V

　　Integrated 1 A primary side MOSFET driver

　　Integrated 1 A secondary side MOSFET drivers for synchronous rectification

　　Integrated error amplifier and <1% accurate reference voltage

　　Programmable frequency range: 50 kHz to 600 kHz

　　Duty cycle clamp limit 85%

　　Programmable soft start and soft start from precharged load

　　Protection features such as short circuit, output overvoltage, and overtemperature protection

　　Power saving LLM using MODE pin (ADP1071-1only)

　　Cycle by cycle input overcurrent protection

　　Precision enable UVLO with hysteresis

　　Frequency synchronization

　　Safety and regulatory approvals (pending)

　　UL recognition

　　5000 V rms for 1 minute per UL 1577

　　CSA Component Acceptance Notice 5A

　　VDE certificate of conformity

　　DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

　　VIORM = 849 V peak

　　CQC certification per GB4943.1-2011

　　Available in 16-lead SOIC_W package

　　ADP1071-1/ADP1071-2应用:

　　Isolated dc-to-dc or ac-to-dc power conversion

　　Telecom, industrial

　　Small cell

　　PoE powered device

　　Enterprise switches and routers

　　图1.ADP1071-1/ADP1071-2框图

　　图2.ADP1071-1/ADP1071-2外接起动电路和辅助电源的应用电路

　　图3.ADP1071-1/ADP1071-2低输入电压反激应用电路图

　　评估板ADP1071-1EVALZ

　　The ADP1071-1EVALZ allows users to evaluate the ADP1071-1 in flyback topology. The evaluation board is set up to act as an isolated power supply solution that incorporates three output voltages (+5.5 V, +24 V, and −15 V) at a total rated power of 15 W. The evaluation board also provides 5 kV isolation in compact form factor, making it suitable for industrial applications, which usually have a variety of voltage rails.

　　Complete information about the ADP1071-1 is available in the ADP1071-1/ADP1071-2 data sheet. Consult the ADP1071-1/ ADP1071-2 data sheet in conjunction with this user guide when using the evaluation board.

　　评估板ADP1071-1EVALZ主要特性:

　　Full support evaluation kit for the ADP1071-1

　　15 W multioutput flyback topology

　　+24 V, +5.5 V, and −15 V output voltage (VDC)

　　Light load mode (LLM) operation

　　Dedicated internal primary and secondary side MOSFET drivers

　　External reference signal tracking

　　Precision enabled undervoltage lockout with hysteresis

　　Short-circuit, output overvoltage, cycle by cycle input overcurrent, and overtemperature protection

　　Frequency synchronization

　　Soft start and soft stop functionality

　　图4.评估板ADP1071-1EVALZ数字外形图(正面)

　　图5.评估板ADP1071-1EVALZ数字外形图(背面)

　　图6.变压器电路图

　　图7.评估板ADP1071-1EVALZ电路图

　　评估板ADP1071-1EVALZ材料清单:

　　图8.评估板ADP1071-1EVALZ PCB设计图(1):左:板尺寸;右:底层丝印

　　图9.评估板ADP1071-1EVALZ PCB设计图(2):左:顶层丝印;右:顶层布局

　　图10.评估板ADP1071-1EVALZ PCB设计图(3):左:层2;右:层4

　　图11.评估板ADP1071-1EVALZ PCB设计图(4):层3

　　评估板ADP1071-2EBZ3.3V

　　The ADP1071-2EBZ3.3V evaluation board allows users to evaluate the ADP1071-2 in a power supply application.

　　The ADP1071-2EBZ3.3V evaluation board is set up to act as an isolated power supply unit (PSU), with a rated load of 3.3 Vdc 3 A from a 36 Vdc to 60 Vdc source. There is also an auxiliary output of 8.0 Vdc, 10 mA. The operation of the converter is in continuous conduction mode (CCM).

　　All connectors and multiple test points allow easy access to all critical circuit nodes and pins of the ADP1071-2.

　　Multiple test points allow easy access to all critical circuit nodes and pins of the ADP1071-2.

　　Full data on the ADP1071-2 can be found in the ADP1071-2 data sheet, available from Analog Devices, Inc., which must be consulted in conjunction with this user guide when using the evaluation board.

　　评估板ADP1071-2EBZ3.3V主要特性:

　　Full support evaluation kit for the ADP1071-2

　　10 W flyback topology

　　3.3 V output voltage (Vdc)

　　3 A steady state

　　Auxiliary output of 8.0 Vdc, 10 mA

　　Forced CCM operation

　　Integrated drivers primary side MOSFET and secondary side synchronous rectifier

　　External reference signal tracking

　　Precision enable undervoltage lockout with hysteresis

　　Short-circuit, output overvoltage, and overtemperature protection

　　Cycle by cycle input overcurrent protection

　　Frequency synchronization

　　Soft start and soft stop functionality

　　图12.评估板ADP1071-2EBZ3.3V外形图

　　图13.评估板ADP1071-2EBZ3.3V框图

　　图14.评估板ADP1071-2EBZ3.3V电路图

　　评估板ADP1071-2EBZ3.3V材料清单: