EUP9268-恒压恒流光耦回馈的Flyback控制器 DataSheet 

概述
EUP9268是一个通过光耦回馈实现自动调节恒压输出，并且通过辅助线圈检测实现自动调节恒流输出的AC-DC控制器。EUP9268通过HV引脚控制耗尽型NFET实现快速启动并降低静态功耗，并通过DCM模式下的波谷检测减少开关损耗。采用PWM和PFM模式自动切换调节，且最高频率为100KHz，最低频率为170Hz，实现高的转换效率及小于30mW静态功耗。EUP9268内置了热关断、过流、输出过压及输入过压保护功能，同时可通过NTC引脚检测环境温度进行过温保护。

特点
•<30mW的空载功耗
•±1%的恒压±5%恒流调整精度
•输出驱动电压钳位
•170Hz～100KHz开关频率
•适用小尺寸外部元件
•光耦反馈调节恒压和源边反馈调节恒流
•有源器件启动使启动速度更快
•SOT23-6和SOP-8 封装
•符合RoHS规范及Pb-Free

应用
•消费类电子产品适配器
•AC-DC电源

EUP9268-Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback 

Description
The EUP9268 is a high performance AC-DC power supply controller which provides constant output voltage (CV) using the Secondary Side Regulation (SSR) and accomplishes constant output current (CC) through Primary-side Regulation (PSR) techniques.
The device together with an external depletion mode NFET provides a fast start-up time without consuming extra power dissipation in no-load. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching effectively reduces switching losses.
The controller operates in pulse width modulation mode (PWM) or pulse frequency modulation mode (PFM) automatically to keep the conversion high efficiency within the line ranges and contains thermal shutdown function, over-voltage protection and over-current protection. A wide switching frequency range from 170Hz to 100kHz can achieve both less than 30mW no-load power dissipation and high average active efficiency.

Feature
‧<30mW No-Load Power.
‧±1% Voltage Regulation and ±5% Current Regulation
‧Clamped Gate-Driver Output for MOSFET
‧170Hz ~ 100kHz Switching Frequency
‧Tiny External Components
‧Opto-Coupler Feedback of CV and Primary Side Regulation(PSR) for CC
‧Active Start-up Scheme Enables Fastest Possible Start-up.
‧Available in SOT23-6 and SOP-8 Packages
‧RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free

Application
‧Adapters for Consumer Electronics
‧AC and DC Power