EUP9293-同步整流控制器  DataSheet
概述
EUP9293 SR 控制器是一款高性能控制器和驱动器，面向用于二次侧同步整流的N沟道MOSFET电源器件。
控制器和MOSFET组合构成一个近似理想的二极管整流器。该解决方案不仅可直接降低整流器的功耗，同时凭借着效率的提高还能够降低一次侧的损耗。
EUP9293采用伏秒平衡控制方法并且不与MOSFET的漏极直接相连，因此在较宽的输出电压范围内都是反激电源理想选择。开启关断SR的阈值与MOSFET
RDS(on)无关，这样可优化最长导通时间。
当一次侧NMOS导通时，EUP9293检测到SYNC信号下降，则立即关断输出。
EUP9293控制器提供了频率检测器，可在低功耗状态期间自动切换至待机模式，同时内置引脚故障保护功能。EUP9293兼容非连续模式（DCM）、谐振模式（QR）和连续模式（CCM）三种工作模式。
特点
•针对5V至24V反激系统进行优化的二次侧同步整流（SR）控制器
•伏秒平衡SR导通时间控制
•兼容一次侧反馈和二次侧反馈控制
•支持非连续和谐振工作模式
•通过SYNC同步接口支持连续工作模式
•短路引脚故障保护
•SOT23-6封装
•符合RoHS，100%无铅无汞
应用
•开关模式电源供电（非连续、谐振和连续模式）
•智能手机和桌面电脑充电器
•服务器、台式机和电器应用的高效辅助电源
EUP9293-Synchronous Rectifier Controller
Description
The EUP9293 is a high performance controller used to secondary side synchronous rectifier (SR).
The fundamental of EUP9293 is utilized N-channel MOSFET power devices used for secondary side synchronous to emulate a near-ideal diode rectifier. This method not only directly reduces power dissipation of the rectifier but also reduces primary side losses as well.
The EUP9293 is applied voltage-second balancing control method and not directly connected to the MOSFET drain, so it is ideal for flyback power supplies over the wide-output voltage range. The SR drive turn-off threshold is not related to the MOSFET RDS(on), which allows optimizing for maximum conduction time.
The EUP9293 will shuts down gate driver immediately according to SYNC drop down when the primary side NMOS turning on.
The EUP9293 offers a frequency detector to automatically switch to standby mode during low power conditions and pin fault protections. It is compatible with DCM, QR and CCM operation
Feature
•Secondary-Side SR Optimized Controller for 5V to
24V Flyback Systems
•Volt-Second Balance SR On-Time Control
•Compatible with Primary-Side and Second-Side
Control
•Supports DCM and QR operation
•SYNC Interface for CCM Operation
•Short Pin Fault Protection
•Available in SOT23-6 Packages
•RoHS Compliant
Application
•Switching Mode Power Supply(DCM, QR and CCM)
•Chargers for Smart Phones and Tablets
•High Efficiency Auxiliary Power in Server
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