输入、输出规格 85 ~264V AC Input ; 5V 2 2. .1 1 A Output
文档编号 CR5448 _5V 2.1 1A A
CR5448简介:
● CR5448 是一款具有高压启动电路、内置 600V 高压功率 MOS,反激
式 PWM 功率开关 IC;
● CR5448低启动电流:3uA(Typ),低工作电流:1.7mA(Typ);
● CR5448内置软启动,减小 MOSFET 的应力,内置斜坡补偿电路;
● CR5448 105kHz 开关频率,具有频率抖动功能,使其具有良好的 EMI 特性;
● CR5448全电压输入范围,待机小于 50mW;
● CR5448全电压平均效率 77%以上,满足“能源之星 V2.0- V 级能效”标准;
● CR5448具有“软启动、OVP、OCP、SCP、OTP”等多种保护功能;
●CR5448 电路结构简单、较少的外围元器件,适用于低成本小功率 AC/DC
电源适配器、充电器。
目 录
1 样机介绍: ........................................................................................................... - 2 -
2 样机特性: ........................................................................................................... - 3 -
2.1 输入特性: ................................................................................................. - 3 -
2.2 输出特性: ................................................................................................ - 3 -
2.3 整机参数: ................................................................................................ - 3 -
2.4 保护功能测试: ........................................................................................ - 4 -
2.5 工作环境: ................................................................................................ - 4 -
3 样机结构信息: ................................................................................................... - 4 -
3.1 电路原理图及 PCB 版图: ........................................................................ - 4 -
3.2 变压器绕制工艺: .................................................................................... - 5 -
3.3 元器件清单: ............................................................................................ - 6 -
4 性能测评: ........................................................................................................... - 7 -
4.1 输入特性: ................................................................................................ - 7 -
4.2 输出特性: ................................................................................................ - 8 -
4.2.1 线性调整率和负载调整率: ......................................................... - 8 -
4.2.2 输出电压纹波: ............................................................................. - 8 -
4.2.3 电流纹波测试: ........................................................................... - 10 -
4.2.4 输出电压过冲、下冲测试: ....................................................... - 10 -
4.2.5 动态负载测试: ........................................................................... - 12 -
4.2.6 时序测试: ................................................................................... - 13 -
4.2.7 V-I 特性曲线: ............................................................................ - 15 -
4.3 保护功能: .............................................................................................. - 15 -
4.3.1 过流保护: ................................................................................... - 15 -
4.3.2 短路保护: ................................................................................... - 15 -
5 其它重要波形测试: ......................................................................................... - 16 -
1 CR5448 样机介绍:
该测试报告是基于一个能适用于宽输入电压范围,输出功率 11W,恒压输出
的工程样机,控制 IC 采用了本公司的 CR5448。