High-Precision Adjustable Threshold Over-Temperature Protection Circuit for DC-DC Converters
The aim of this paper is to present a high-precision over-temperature protection circuit designed to shield DC-DC converters from damage due to excessive heat.A temperature sensor is constructed using a cascade of tran-sistors to achieve enhanced detection sensitivity.The temperature hysteresis is adjustable through a voltage divider circuit,which is dependent on the resistance values in the circuit,simplifying the circuit's design.The circuit has been integrated using a 5V 180nm BCD process.Simulation results indicate that at a 5 V supply voltage,the over-temperature threshold is approximately 160℃,with a temperature hysteresis of approximately 30℃.The varia-tion in the over-temperature threshold and hysteresis temperature,as the supply voltage fluctuates between 2.5V and 5.5V,are 1.03℃ and 1.35℃,respectively.
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