摘要
利用根据负载电流的大小改变调制模式的方法实现了一种降压型高转换效率的DC/DC开关电源,并采用二次集成的方式在芯片内部集成了功率p-M O SFET。当控制电压占空比小于20%时,采用PFM(Pu lse-F requency M odu lation)模式调制;占空比大于20%时,采用PWM(Pu lse-W idth M odu lation)模式调制,平均转换效率约为93%,输出电流范围可以从0.01 A到3.0 A。当输出驱动电流为3.0 A时,整个调制控制电路的功耗仅为6.0 mW。输入电压为5 V时,负载调整率小于1.5%;负载电流为0.01 A时,线性调整率小于0.5%。
A step down DC/DC switching regulator is implemented by dynamic altering the modulation mode according to the load current and a power p-MOSFET is used in the chip by hybrid integration. The PFM mode varies in a range of duty ratio from 0 to 20%, and the PWM mode varies from 20% to 100%. The avenge conversion efficiency is about 93% and the output current can be 3 A. The load regulation is less than 1.5% when power supply is 5 V and load current range from 0.01 A to 3.0 A. The line regulation is less than 0. 5% when load current is 0. 01 A. The power of whole control-circuit is about 6.0 mW.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2006年第2期209-213,共5页
Research & Progress of SSE
基金
国家科技预研基金项目(51408010601DZ01)资助
