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控制器与高压MOSFET简化设计非隔离开关
有许多应用在离线开关采用交流电源供电的需要小包装或必须占用系统主板空间小。这些可以从“总是”智能电表用于家庭自动化，能源消费监测家用电器，低成本离线LED驱动器在照明应用与高功率因数，以满足国际要求的总谐波失真（THD），EMC和安全性。
更高的效率和输出电流能力的两个设备制造商迁移到交换机的更令人信服的理由。这些好处将有助于原始设备制造商满足监管要求降低功耗，同时满足更大的电流需求。然而，其他开关的优点，如更小的尺寸，更宽的输入电压范围，和故障保护，以及显着。
Makers of such integrated controllers with built-in high-voltage MOSFETs for non-isolated low-power AC/DC conversion applicaTIons include power semiconductor manufacturers like Texas Instruments， Power IntegraTIons， STMicroelectronics， Fairchild Semiconductor， and ON Semiconductor among others. TI recently unveiled an integrated controller UCC28880 for these applicaTIons. It integrates a pulse-width-modulated （PWM） controller and a 700 V MOSFET， as well as a high-voltage current source on a single chip， enabling start-up and operation directly from the rectified mains voltage （Figure 1）。 Plus， as shown in Figure 1， it includes a 5 V regulator and protection functions like a current limiter， over-temperature protection， under-voltage lockout （UVLO）， and overload protection for short circuit at the output.
