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采用CSMC0.5μm工艺,设计了一种新型过温保护电路。从检测温度和控制温度两方面考虑,通过优化电路结构,提出一种新型系统解决方案。在不引入热振荡的前提下,实现稳定电路温度和输出关断信号的双重功能。采用Cadence的Spectre仿真器进行仿真,结果表明,温度在-50～200℃时,PTAT电压以10.5 mV/℃变化,过温保护开启温度为105℃,具有滞迟功能。成功流片后对芯片进行测试,结果显示,在20～130℃内,PTAT电压灵敏度约为10 mV/℃,过温保护开启温度的实测值与仿真值的偏差小于3℃,滞迟范围为20℃。该保护电路是开关电源IP的重要组成部分,在设计过程中时刻考虑其工艺健壮性和可重用性的约束条件,确保其可移植性。
Using CSMC0.5μm process, a new type of over-temperature protection circuit is designed. Considering both the detection temperature and the control temperature, a new type of system solution is proposed by optimizing the circuit structure. In the introduction of thermal oscillation under the premise of achieving a stable circuit temperature and output shutdown signal dual functions. The simulation with Cadence Spectre simulator showed that the PTAT voltage varied from 10.5 mV / ℃ to -50 ~ 200 ℃ and the over-temperature protection turned-on temperature was 105 ℃, with a delay function. The test results show that the PTAT voltage sensitivity is about 10 mV / ℃ within 20 ~ 130 ℃, the deviation between the measured value and the simulation value of the over-temperature protection opening temperature is less than 3 ℃, and the delay range is 20 ° C. The protection circuit is an important part of the switching power supply IP, in the design process always consider its process robustness and reusability constraints, to ensure its portability.