Controlled slew rate enhancement circuit for error amplifier in high frequency DC-DC converters

Author

Zhang, Chunming ; Shao, Zhibiao

Author_Institution

Sch. of Electron. & Inf. Eng., Xi´´an Jiaotong Univ., Xi´´an

fYear

2008

fDate

Nov. 30 2008-Dec. 3 2008

Firstpage

1852

Lastpage

1855

Abstract

Modern power applications are driving the demand for power supply systems with fast transient response. A novel controlled slew-rate enhancement (CSRE) circuit for error amplifier in high frequency DC-DC converters is proposed to improve transient responds of DC-DC converters under large load current changes. The CSRE circuit with embedded current-detection is connected in parallel with the error amplifier. By detecting the maximum difference current corresponding to the maximum derivation of the output voltage and optimizing sizes of the CSRE circuit, the CSRE circuit can be controlled properly so that the system stability can be guaranteed in various operating conditions. When the proposed circuits was employed in 100 MHz buck DC-DC converters implemented in SMIC 0.18 mum CMOS process, the simulation results of transient responses show that the CSRE circuit improves the average 1% settling time by 20 times and overshoot by 16 times, while the total quiescent power is only increased by less than 7.1.

Keywords

CMOS integrated circuits; DC-DC power convertors; amplifiers; circuit stability; power supply circuits; transient response; SMIC CMOS process; buck DC-DC converter; controlled slew rate enhancement circuit; embedded current-detection; error amplifier; frequency 100 MHz; high frequency DC-DC converter; power supply system; size 0.18 mum; transient response; CMOS process; Circuit stability; Control systems; DC-DC power converters; Error correction; Frequency conversion; Power supplies; Size control; Transient response; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Conference_Location

Macao

Print_ISBN

978-1-4244-2341-5

Electronic_ISBN

978-1-4244-2342-2

Type

conf

DOI

10.1109/APCCAS.2008.4746404

Filename

4746404