同步整流DC/DC升压芯片中驱动电路的设计

Driver Circuit Design for Synchronous Step-up DC/DC Converter

在DC/DC转换芯片中,为了保证功率开关管及时导通和截止,需要设计专门的驱动电路。本文设计了同步整流驱动电路,通过引入负跳沿延时单元,消除了CMOS瞬态短路导通现象,降低了功耗,保护了输出级。HSPICE仿真表明,驱动电路延时小于14ns,能满足较高开关频率的要求;同时,开关转换时的尖峰电流减小了56%,功耗也降低了19.3%。

The main design issues such as propagation delay and power dissipation have been addressed for the gate-driver of DC/DC switching regulator and a gate-driver for the synchronous rectifier. MOSFET is then proposed in this paper, in which an improved circuit not only reducing the power dissipation, but also protecting output stage is given. The result of simulation using HSPICE shows that the improved circuit has less than 14ns propagation delay, reduces 56% peak current, and saves 19.3% power as well.