一种应用于低压差线性稳压器的新型折返限流电路

发布时间：2018-08-09 19:16

【摘要】：针对大功率负载的电源管理芯片容易出现过载、短路问题,提出一种利用采样电流转化为采样电压的限流模式折返保护电路。该电路限流环路利用缓冲器双支路实现实时控制,其工作状态随输入电压有所转变,hspices仿真实验验证了该电路限流值稳定,基本不随着电源电压的变化而变化,而且芯片的短路功耗降低60%。采用联华电子公司0.5μm 5 V的CMOS工艺线在低压差线性稳压器(LDO)中进行了投片验证,实测芯片常值限流200 mA、折返限流80 mA,自身静态电流极低仅2μA左右。投片测试结果表明,该电路起到保护作用的同时,符合现代电源管理芯片对高效率低功耗的要求。
[Abstract]:Aiming at the problem of overload and short circuit in high power load power management chip, a current limiting mode reentrant protection circuit is proposed, which is converted from sampling current to sampling voltage. The current limiting loop of the circuit realizes real-time control by using the double branches of buffer. The simulation results show that the current limiting value of the circuit is stable and does not change with the change of power supply voltage, and its working state is changed with the change of input voltage. The simulation results show that the current limiting value of the circuit is stable and does not change with the change of power supply voltage. And the short circuit power consumption of the chip is reduced by 60%. The CMOS process line of 0.5 渭 m 5 V of Lianhua Electronics Company was used to test the chip's (LDO). The measured chip's constant current limiting current was 200mA. the reverse current limiting current was 80mA, and the static current was only about 2 渭 A. The test results show that the circuit has the function of protection and meets the requirements of modern power management chip for high efficiency and low power consumption.
【作者单位】：西安电子科技大学CAD研究所;空军工程大学防空反导学院;中国人民解放军空军93861部队;
【基金】：国家自然科学基金(61106026) 中央高校基本业务费(K2014408201)资助
【分类号】：TM44

【相似文献】