TI UCC28630高度集成大功率反激电源解决方案

TI 公司的UCC28630是高度集成大功率反激电源控制器,连续导通模式(CCM)和不连续导通模式(DCM)工作,内置700V起动电流源,有源X电容放电功能,恒流(CC)模式限制,高栅极驱动电流,30mW系统待机功耗,主要用在笔记本电脑,游戏控制台个打印机的AC/DC适配器,工业,白家电,LCD监视器的开架开关电源,以及10W-65W的高效AC/DC电源.本文介绍了UCC28630主要特性, 功能框图以及评估板UCC28630EVM-572(9.5-V, 65-W笔记本电脑适配器)主要特性,电路图,材料清单和PCB元件布局图.
The UCC28630 device is a highly-integrated, primary-side-regulated (PSR) flyback controller. The device supports magnetically-sensed output voltage regulation via the transformer bias winding. This feature eliminates the need for a secondary-side reference, error amplifier and opto-isolator. The device employs an advanced internal control algorithm that offers accurate static output voltage regulation against line and load. The fixedpoint, magnetic-sampling scheme allows operation in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Additionally, the device achieves accurate constant-current (CC) control of the output current limit using only primary-side, current sensing. Uniquely, this CC function operates seamlessly as the operating mode changes between DCM and CCM operation.
The controller includes an internal, high-voltage (HV) start-up current-source, and employs low-power sleep modes and switching frequency reduction, to improve light-load efficiency and standby power. The device typically achieves standby power levels between 0.05% and 0.1% of peak output power. The controller operates in either DCM and CCM, using a mix of peak current-mode PWM (AM) and switching frequency modulation (FM) schemes. The control approach improves performance (efficiency, size and cost) and can reduce transformer size and cost by allowing operation in CCM with FM during peak overload conditions.
Extensive protection features are incorporated, including output overvoltage protection (OVP), bias rail overvoltage and undervolta...