Design and Optimization of Buck Converter Applicable for Wide Input Voltage Range
The present work designed a 0.18 μm DTI high-voltage BCD process-based Buck converter which is applicable to scenarios with input voltage of 8～36 V,output voltage of 6～7 V,load current of 50 mA～2 A,and temperature range of-40～150 ℃.The design uses parallel active devices to achieve low losses,and a comparator with high-voltage floating ground technology for voltage comparison.It adopts bootstrap technology to achieve a high voltage source which can drive the PWM control signal of the power transistor through a high voltage Level shift circuit,and employs pre-driv-en and post-driven control to reduce current loss.A light load skip cycle working mode and over/under-voltage check cir-cuits were also utilized to reduce switch conduction loss and improve reliability.In addition,the converter is designed to realize automated fault handling through cycle-by-cycle self detective circuits.The simulation results show that when the input voltage is 14 V and the output voltage is 6.5 V,and the load current is between 0.2～2 A,the conversion efficiency of the circuit remains above 90％ with a peak value of 93.18％.
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维普
