恒定导通时间电路的设计与实现

Design and Realization of Constant On-Time (COT) Control Mode

电子产品便携式及大功率的应用,要求供电芯片具有快速瞬态响应及高稳定性。采用与输入电压成正比的电流进行充电,并利用输出电压作为参考电压,设计一种恒定导通时间电路,可有效解决恒定电流充电下系统滤波器设计难的问题,同时可提高系统对输入的响应速度。仿真验证表明,恒定导通时间电路有效地提升了电流的精确度及系统的响应速度。

Being portable and of great power, electronic devices usually require power supply chips of quick and instant response and of high stability. By means of using the circuit proportionate to input voltage to charge and also use the output voltage as the reference voltage, the Constant On-Time (COT) control mode is designed which can effectively solve the difficult problem of constant circuit filter in charging system and which can also cause the system to give a quicker response to input. Emulational experiments prove that the Constant On-Time (COT) control mode can effectively upgrade circuit accuracy and speed up the response of the system.