A Design Of High Voltage BOOST Voltage Regulator With Dual Frequence

With the advent of the information age,the development of electronic power technology is changing with each passing day.As the core technology of power equipment energy,now the power management is confronted with severe challenges,but it also accelerates the update of power management chips.At present,the wide application of mobile phones,Internet of Things and portable electronic products has also improved the performance and requirements of power supplies.Compared with linear regulators,switching power supplies have the advantages of high conversion efficiency,low power consumption,and flexible topology.Switching power supplies occupy an important position in circuit management.Based on the peak current mode,a BOOST converter HWD1933 is designed,which supports 600 k HZ and 1.6MHZ dual-frequency operation.The input voltage is 2.7V~14V,and the output voltage can reach up to 30 V.The chip adopts voltage loop and current loop to ensure the stability of the system.In order to avoid the influence of the right half plane zero on power stage circuit stability,the voltage loop adopts the internal compensation and external compensation,which produces the type II compensation of the two-poles and one-zero.The compensation circuit controls the unity gain bandwidth at a lower frequency to ensure the stability of the loop;the current loop collects the inductor current flowing through the power MOS,and the slope compensation circuit is applied to solve the subharmonic oscillation problem of peak current mode.The bandgap transconductance amplifier combines the bandgap reference circuit with the transconductance amplifier.The output feedback voltage directly outputs the control signal compared with the self-generated reference voltage,which simplifies the circuit structure while ensuring the circuit function.The oscillator circuit adds a temperature compensation structure that produces an approximately temperature-independent oscillation frequency at the PTAT bias current,ensuring stability of the system oscillation frequency.Based on the 0.5?m BCD process,the circuit uses Cadence software for module functional simulation and overall circuit simulation.The results show that the chip works stably with an input voltage of 2.7V~14V.When the load current changes from 50 m A to 300 m A,the maximum undershoot voltage is 300 m V,and the recovery time is only 45?s;When the input voltage changes from 2.7V to 5V,the maximum overshoot voltage is 295 m V,and the recovery time is 41?s;the load regulation of the chip is 1.04%/A,the line regulation is 0.05%,and the highest conversion efficiency is 90%.The overall simulation results show that the BOOST converter has the characteristics of high input and output voltage range,fast transient response,low load regulation,low line regulation and high conversion efficiency.It is expected to be applied to the actual circuit system after the tapeout and the test.