【摘要】 设计了一种基于峰值电流模控制的浮动栅驱动电路,包括浮动栅宽电路和浮动栅压电路。电感电流的峰值由误差放大器的输出电压决定,不需要额外的负载电流信息进行浮动栅控制。可以根据负载电流的大小自适应调节功率管的栅宽和栅压,使效率得到优化。仿真结果表明,在1 MHz开关频率、5V输入、0.8V输出的双N管Buck变换器中,采用浮动栅驱动控制的Buck变换器与普通的Buck变换器相比,在轻载情况下最多可达到10%的效率提升。更多还原

【Abstract】 A self-scaling gate drive circuit based on the peak-current mode control was presented.Both the gate driving voltage and the gate width could be adjusted automatically.Because the peak current in the inductor of the peak-current mode control was subject to the output of the error amplifier,an extra detecting signal of the load current was unnecessary.The gate widths and the gate driving voltages could be adjusted adaptively with the change of load current to optimize the efficiency.Simulation results showed that the efficiency of the Buck converter that was adopting the proposed self-scaling gate drive circuit with double N-type transistors was improved by 10% in light load compared with the normal ones when the Buck converter operated in 5Vinput,0.8Voutput and 1MHz switching frequency.更多还原