原标题：基于ON NCP1565的100W高效小型化DC-DC Brick通信电源解决方案

　　世平集团推出的1/4 Brick 100W 高效小型化DC-DC模块解决方案，是采用安森美(ON Semi) 半导体新一代高效能BiCMOS制程NCP1565 有源钳位(Active-Clamp) PWM IC. 此一IC 最高操作频率可以达到1.5 MHZ，加上内建120V 高压启动电路，适用于通讯电源Telecom Power 输入48V-72V 的应用。

　　场景应用图

　　展示板照片

　　方案方块图

　　核心技术优势

　　1. 支持Voltage Mode 与Peak Current Mode 双模控制

　　2. 内建可调适Overlap Time 控制，减少交越损失，提高效率

　　3. 内建120Vdc_in 启动电压电路

　　4. 可调式低电压磁滞范围(UVLO Hysteresis)保护

　　5. 基于平均电流的过电流保护机制

　　6. 内建短路保护

　　方案规格

　　1. 可调式Duty Ration clamp , 缓启动Soft-Start , shutdown 及重开机delay 时间

　　2. 可外部设定操作频率最高1.5MHZ

　　3. 主回路驱动电流2A Sink/ 3A Source，钳位驱回路电流 2A Sink/ 1A Source

　　4. 无铅无卤素及符合欧盟有害物质管制标准

　　技术文档

　　NCP1565: PWM Controller, Highly Integrated Dual-Mode Active Clamp

　　The NCP1565 is a highly integrated dual-mode active-clamp PWM controller targeting next-generation high-density, high-performance and small to medium power level isolated dc-dc converters for use in telecom and datacom industries. It can be configured in either voltage mode control with input voltage feed-forward or peak current mode control. Peak current mode control may be implemented with input voltage feed forward as well. Adjustable adaptive overlap time optimizes system efficiency based on input voltage and load conditions. This controller integrates all the necessary control and protection functions to implement an isolated active clamp forward or asymmetric half-bridge converter. It integrates a high-voltage startup bias regulator. The NCP1565 has a line undervoltage detector, cycle-by-cycle current limiting, line voltage dependent maximum duty ratio limit, and programmable overtemperature protection using an external thermistor. It also includes a dual-function FLTSD pin used for communicating the presence of a fault but also for shutting down the controller.

　　特性

　　Both Voltage Mode Control and Current Mode Control

　　Line feedforward

　　Adaptive Overlap time Control

　　Integrated 120 V HV Startup

　　Programmable Line Undervoltage Lockout (UVLO) with Adjustable Hysteresis

　　Cycle by Cycle Peak Current Limiting

　　Overcurrent Protection Based on Average Current

　　Programmable Duty Ratio Clamp

　　Programmable Soft-Start

　　Programmable Shutdown and Restart Delays

　　Programmable External Overtemperature Protection Using Thermistor

　　FLT/SD pin Used for Fault reporting and Shutdown Input

　　Programmable Oscillator with 1.5 MHz Maximum Frequency

　　Main Switch Drive Capability of -2 A/3 A

　　Active Clamp Switch Drive Capability of -2 A/1 A

　　Short Circuit Protection

　　5 V 2% Voltage Reference

　　VCC Range: from 6.5 V to 20 V

　　优势

　　Flexible topology solution

　　Stable constant crossover across input voltage range

　　Extended ZVS across input & output operating conditions

　　Lossless startup and reduced Vcc capacitor via dynamic startup

　　Safely limits operating input voltage range

　　Increased converter robustness

　　Precise output power limit

　　Efficiently prevents transformer saturation

　　Lowers components stress at startup

　　Robustness and flexibility of design

　　Robustness and flexibility of design

　　Good system integration

　　Ready for high frequency designs

　　Drive larger MOSFETs more efficiently

　　More efficient drive capability

　　应用

　　High Efficiency Isolated dc−dc Converters

　　Server Power Supplies

　　24 V and 48 V Telecom systems

　　42 V Automotive Applications

　　终端产品

　　Telecom systems

　　Servers