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| Design and implementation of off-line switching power-supply controller |
| YUAN Ting, HE Le-nian, KE Xu-gang |
| Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China |
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Abstract A design method of an offline switching power-supply controller with properties of highefficiency and lowpower is presented to improve performances of offline power supplies. The controller was designed on basis of pulse-width modulation (PWM) mode and pulse skipping modulation (PSM) mode. The design method of the controller loop is based on the peak current mode. The controller operates in PWM mode, when the feedback voltage is less than 4.75 V, and works in PSM mode otherwise, ensuring high efficiency. Additional functions, such as shortcircuit protection, over-voltage protection, under-voltage lockout, internal slope compensation, leading-edge blanking on current sense are included. For reducing the electromagnetic interference (EMI), the switching frequency is designed to be randomized within the range of 1 kHz at around centre frequency to flatten the power spectral density (PSD). The chip was implemented by using TSMC's 0.6 μm 40 V high voltage BCD process. Simulation results indicate that the controller realizes the required working modes and performs seamless switching between the modes. The controller can be applied to Li-Ion battery charger with a wide range of AC input (85~264 V) or power adapter.
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Published: 23 December 2010
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离线式开关电源控制器芯片的设计与实现
为了提高离线式开关电源的性能，提出一种的高效率、低功耗的离线式开关电源控制器芯片的设计方法.该控制器是基于脉宽调制(PWM）模式和脉冲间隙调制(PSM)模式方式设计.控制器环路控制方式采用峰值电流控制.在反馈电压小于4.75 V时采用PWM工作模式，在反馈电压大于4.75 V时采用脉冲间歇调制模式控制.另外，电路还具有短路保护、过压保护、欠压保护、内部电流斜率补偿、电流采样死区控制的功能.为了降低系统的电磁干扰（EMI），芯片在一定的频率范围（1 kHz）内随机改变脉冲频率，以拓宽频谱.芯片采用TSMC 0.6 μm 高压40 V BCD工艺模型实现.仿真结果表明，该电路可实现两个工作模式及相互之间的平稳过渡，适用于大范围交流输入（85～264 V）的锂电池充电器或电源适配器.
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