The utility model discloses a double low dropout linear regulator circuit includes an error amplifier, a second amplifier, power tube, compensation unit, output sampling network, load capacitance and load circuit, feedforward amplifier, pull-up driving tube, pull-down driving tube and a sampling tube. Including the two loop, the main loop comprises an error amplifier, a second amplifier, a pull-up driving tube, power tube and output sampling network, forming a negative feedback loop to stabilize the output voltage: V OUT. The additional loop includes a feedforward amplifier, sampling tube, pull-down driving tube and power tube, the reference output voltage loop, form a negative feedback loop, dynamic compensation circuit, to further stabilize the output voltage of V: OUT, referring to the load current, forming a positive feedback loop, accelerate the response of the circuit load step change. The utility model enables the circuit to provide better transient response and better peripheral circuit selection, as well as better phase margin.
【技术实现步骤摘要】
【技术保护点】
一种双环低压差线性稳压器电路,包括误差放大器(1)、第二级放大器(2)、功率管(3)、补偿单元(4)、输出采样网络(5)、负载电容(6)和负载电路(7);误差放大器(1)的负向输入端接参考电压V↓[REF],正向输入端接输出采样网络产生的反馈电压信号V↓[FB],误差放大器(1)比较两个输入信号,将两输入信号的误差信号进行放大后单端输出,误差放大器(1)的输出端与放大电路(2)的输入端连接,将输出信号输入到放大电路(2)进行下一级放大;补偿单元(4)连接在误差放大器(1)输出端和放大电路(2)输入端连接处,对电路进行频率补偿;输出采样网络(5)包括串联的电阻R1和R2,R2上端接LDO电路的输出电压V↓[OUT],下端和R1的上端相连,产生V↓[FB]电位,输入到误差放大器的正相输入端;R1的下端接地;负载电容(6)上端接LDO电路输出电压V↓[OUT];下端直接接地;负载电路(7)接LDO电路的输出电压V↓[OUT];其特征在于:该电路还包括前馈放大器(8)、上拉驱动管(9)、下拉驱动管(10)和采样管(11);前馈放大器(8)的负向输入端接LDO电路的输出电压V↓[OUT];正向输 ...
【技术特征摘要】
【专利技术属性】
技术研发人员:邹雪城,刘政林,张科峰,雷鑑铭,郑朝霞,邹志革,骞海荣,
申请(专利权)人:华中科技大学,
类型:实用新型
国别省市:83[中国|武汉]
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