摘要
为了解决高压恒流源芯片内部低压模块供电问题,通过集成降压预调整电路、前置基准源和线性稳压器3个模块,设计了一种宽电压输入范围的降压稳压电路。采用0.6μm BCD工艺模型进行仿真验证。结果显示,降压预调整电路低压跟随时压差在50 mV内。输入在6～40 V范围内变化时,偏置和基准的变化分别为1.13 mV和0.3 mV幅度。线性稳压器直流下PSRR可达-85 dB,在1 MHz工作频率下,输入电压为6 V和40 V时,模拟电源变化幅度分别不超过24 mV和46 mV,数字电源变化幅度分别不超过0.3 V和0.8 V。该降压稳压电路已成功应用于高压LED恒流源中。
A buck regulator circuit with wide voltage input range was designed,into which buck pre-regulator circuit,pre-reference source and a linear regulator were integrated,to provide power supply for built-in low-voltage module in high-voltage current source IC.Based on 0.6 μm BCD model,the circuit was simulated for verification.Results showed that voltage drop of the buck pre-regulator circuit was less than 50 mV when low-voltage followed,and biasing and reference voltages only changed by 1.13 mV and 0.3 mV,respectively,for an input range from 6 V to 40 V.The linear regulator had a PSRR of-85 dB at low frequency.The analog power output changed by less than 24 mV and 46 mV,respectively,for 6 V and 40 V input at 1 MHz operating frequency,while the digital power output changed by less than 0.3 V and 0.8 V,respectively.The step-down regulator was successfully used in a high-voltage LED constant current source.
出处
《微电子学》
CAS
CSCD
北大核心
2011年第1期53-56,共4页
Microelectronics
基金
国家教育部博士点基金资助项目(200806141100)
广东省自然科学基金资助项目(8452840301001693)
