上海屹晶微电子有限公司 EG1181 芯片数据手册 V1.3
48V 电池供电系统降压型开关电源芯片
2010 ? 上海屹晶微电子有限公司 版权所有
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目录
1. 特点 ..................................................................................................................................................................... 4
2. 描述 ..................................................................................................................................................................... 4
3. 应用领域 ............................................................................................................................................................. 4
4. 引脚 ..................................................................................................................................................................... 5
4.1. 引脚定义 ............................................................................................................................................. 5
4.2. 引脚描述 ............................................................................................................................................. 5
5. 结构框图 ............................................................................................................................................................. 6
6. 典型应用电路 ..................................................................................................................................................... 6
7. 电气特性 ............................................................................................................................................................. 8
7.1 极限参数 ............................................................................................................................................. 8
7.2 典型参数 ............................................................................................................................................. 9
8. 应用设计 ........................................................................................................................................................... 10
8.1 Vin 输入电容 ..................................................................................................................................... 10
8.2 Vcc储能电容 ..................................................................................................................................... 10
8.3 启动过程 ........................................................................................................................................... 10
8.4 振荡器 CT电容的开关频率计算 ....................................................................................................... 10
8.5 输出峰值限流 ................................................................................................................................... 10
8.6 输出短路保护 ................................................................................................................................... 11
8.7 输出电感 ........................................................................................................................................... 11
8.8 续流二极管 ....................................................................................................................................... 11
8.9 输出电容 ........................................................................................................................................... 11
8.10 输出电压调节端( ADJ)设置 ......................................................................................................... 11
9. 封装尺寸 ........................................................................................................................................................... 12
9.1 DIP8 封装尺寸 ................................................................................................................................... 12
9.2 SO8封装尺寸 .................................................................................................................................... 12
9.3 SOP8 - EP封装尺寸 ............................................................................................................................ 13