原标题：基于通嘉LD5523E2 QR+CCM 24W PSR 的适配器电源方案

　　消费型适配器市场应用上，目前主要使用 SSR 架构应用在小于 45W 的适配器产品， PSR 架构大部分使用于小于18W功率的产品，通嘉新一代的 Flyback 产品导入PSR 架构于 LD5523E2，可有效减少原本 SSR 架构 BOM 上的组件数量，产品适用性也拉大到 45W 的应用，在小于 45W 适配器的成本上有更大的优势。且LD5523E2 有优秀的混模技术QR+CCM，效率表现等同SSR;具有线补，可降低输出DC 线号;低频升压机制，降低ripple，减少输出入电容值;低待机功耗;频率切换范围加大，较佳的EMI 表现;支持BNI/BNO 功能;逻辑保护齐全，可靠性高。

　　场景应用图

　　展示板照片

　　方案方块图

　　核心技术优势

　　1. SOT-26 6pin 封装小，PSR回授，支持多重操作模式

　　2. 支持high/low line 75KHz/65KHz 操作频率

　　3. 支持 Brown in/out 功能

　　4. OVP/OLP/CSOVP/SDSP/OTP 保护设计齐全

　　5. 新频率切换技术，较佳的 EMI 表现

　　方案规格

　　1. 适用 18 ~ 45W 输出功率

　　2. Flyback PSR 架构

　　3. QR + CCM 混模

　　4. 超低起动电流 < 1.5uA

　　5. 与 SSR 可共享 PCB 设计

　　技术文档

　　【LD5523E2】

　　PWM+QR Multi-mode Controller with Primary Side Regulation

　　In order to enhance the efficiency performance, the LD5523E2/K2/A2 integrates the multi-mode PWM controller, which consists of Quasi-Resonant (QR) PWM control for light load condition and Continue Conduction Mode (CCM) for heavy load condition. Moreover, the QR controller gains the system performance, but also brings the worse EMI capability, especially at boundary mode in heavy load. While the frequency swapping function of LD5523E2/K2/A2 can reduce the EMI emission of SMPS and helps the power circuit designers to simply deal with EMI filter and saves several component and developing time.

　　The LD5523E2/K2/A2 is implemented in SOT-26 package, and includes the comprehensive protection function, such as Over Load Protection (OLP), Over Voltage Protection (OVP), Output Short Circuit Protection (OSCP) and adjustable Over Temperature Protection (OTP). Furthermore, the programmable brown-in/out protection is built-in.

　　Features

　　PSR CCM+QR Multi-Mode Control.

　　Frequency Swapping for better EMI performance

　　Low Startup Current (<1.5mA)

　　Built-in load regulation compensation

　　65 kHz PWM switching frequency.

　　Current mode control with cycle-by-cycle current limit

　　UVLO (Under Voltage Lock Out)

　　LEB (Leading-Edge Blanking) on CS pin

　　VCC & FB Over Voltage Protection

　　Bulk Over Voltage Protection (K2 only)

　　Adjustable Brown in/out on FB pin.

　　External OTP (Over Temperature Protection) on CS Pin

　　Internal OTP (Over Temperature Protection)

　　Gate Source/Sink Capability: 40mA/-170mA @ output pin with 1nF capacitor.

　　Application

　　Networking power supply

　　Lower Power AC/DC Adaptor