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2013•Journal of Hefei University of TechnologyRequires access

Research and design of a step-down regulator with wide input voltage

Chen Feng

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Abstract

A step-down regulator with wide input voltage was proposed,which was used for power LED driver.This circuit consisted of pre-regulator,bandgap voltage reference and linear regulator,and the maximum input voltage could reach 40V.The circuit was simulated based on CSMC 0.5μm BCD process model.The results showed that under different process corner,when the load current was 5mA and the input voltage changed from 6Vto 40V,the average value of the output voltage of bandgap voltage reference and step-down regulator were 1.206 4Vand 5.012 1V,and the biggest variation were about 0.9mV and 12.3mV.When the load current changed from 1mA to 100mA with an input voltage of 40V,the output voltage changed about 3.3mV.This regulator had a power supply rejection ratio(PSRR)of at least 112dB at low frequency.

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What this paper is about

A step-down regulator with wide input voltage was proposed,which was used for power LED driver.This circuit consisted of pre-regulator,bandgap voltage reference and linear regulator,and the maximum input voltage could reach 40V.The circuit was simulated based on CSMC 0.5μm BCD process model.The results showed that under different process corner,when the load current was 5mA and the input voltage changed from 6Vto 40V,the average value of the output voltage of bandgap voltage reference and step-down regulator were 1.206 4Vand 5.012 1V,and the biggest variation were about 0.9mV and 12.3mV.When the load current changed from 1mA to 100mA with an input voltage of 40V,the output voltage changed about 3.3mV.This regulator had a power supply rejection ratio(PSRR)of at least 112dB at low frequency.

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Available abstract

A step-down regulator with wide input voltage was proposed,which was used for power LED driver.This circuit consisted of pre-regulator,bandgap voltage reference and linear regulator,and the maximum input voltage could reach 40V.The circuit was simulated based on CSMC 0.5μm BCD process model.The results showed that under different process corner,when the load current was 5mA and the input voltage changed from 6Vto 40V,the average value of the output voltage of bandgap voltage reference and step-down regulator were 1.206 4Vand 5.012 1V,and the biggest variation were about 0.9mV and 12.3mV.When the load current changed from 1mA to 100mA with an input voltage of 40V,the output voltage changed about 3.3mV.This regulator had a power supply rejection ratio(PSRR)of at least 112dB at low frequency.

Key concepts: Low-dropout regulator, Dropout voltage, Voltage regulator, Bandgap voltage reference, Regulator, Power supply rejection ratio, Voltage, Voltage divider

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