基本介绍：

安森美不断推出多种电源的解决方案。NCP1027是属于安森美NPC10XX系列的产品。拥有 65 kHz脉宽调制(PWM)控制器集成700 V MOSFET：可调节斜坡补偿特性支持深度CCM工作，优化满载能效。跳周期模式工作优化轻载能效。

基本性能：

内含700V功率的MOSFET,典型RSDON为5.8欧

采用电流控制型工作，振荡频率内不固定在65KHZ

最大峰值电流800mA。

软模式的跨越式工作，峰值电流较低

内部含高压启动电流源，设置了清洁无损耗的启动程序。

输出保护电路，短路撤消后自动恢复

辅助源自动过压保护

可调的布朗输出保护

可调的过功率保护

常设的输入至锁死保护电路

内部频率抖动，降低EM信号尖刺

占空比最大拓展到80%

空载待机功耗在AC265V时小于85mW

500mW负载在AC230下小于715mW。

方案简介;
 
This reference document describes a built−and−tested,GreenPoint[1] solution for an xDSL modem ac−dc adapter.This power supply reference design is intended for lowpower, off−line applications where a regulated outputvoltage is required. Applications would also includemodems, printers, routers, hubs and/or similar consumeraudio and video products that require a single output voltagein the 10 to 20 W range.

方案特点：

The power supply design is based aroundON Semiconductor’s NCP10xx family of monolithiccontrollers with an integrated 700 V MOSFET. In thisparticular design an NCP1027 is utilized in a 12 V, 1.3 Aoutput supply with a surge capability of over 1.6 A.

This design can be tailored for any output voltage fromseveral volts up to 28 V (or higher) with power outputs toapproximately 20 W (depending on the AC inputrequirement) by merely reconfiguring the transformer turnsratio and the voltage reference zener. The power supply willmeettypical safety agency isolation and leakage currentstandards and comply with FCC Part 15 Level B conductedEMI requirements and has an average efficiency of greaterthan 75%.

方案原理图：




方案pcb图：


详情请参见：

http://www.onsemi.cn/pub_link/Collateral/TND330-D.PDF