Analysis of PSM mode in switching converter and its improved mode

Author

Luo, Ping ; Li, Zliaoji ; Zhang, Bo

Author_Institution

Sch. of Microelectron. & Solid-State Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

2

fYear

2005

Lastpage

1389

Abstract

The PSM (pulse skip modulation) mode is widely used in converter IC with light loads or in sleeping mode recently. The state space average equations and the large signal models of a PSM converter are given to specify its basic theory and behavior. The characteristics of the PSM converter, including output voltage ripple, efficiency, response speed and EMI characteristics are analyzed in this paper. Although the PSM converter has many advantages, the high output voltage ripple and its control signal easily enters the audible noise range limiting its utility. A FPSM mode is also proposed in this paper, aimed at obtaining good behavior of the switching converter.

Keywords

PWM power convertors; electromagnetic interference; state-space methods; EMI characteristics; FPSM mode; PSM mode; converter IC; efficiency; large signal models; output voltage ripple; pulse skip modulation; response speed; sleeping mode; state space average equations; switching converter; Acoustic noise; Clocks; Equations; Power transistors; Pulse modulation; Pulse width modulation; Pulse width modulation converters; State-space methods; Switching converters; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems, 2005. Proceedings. 2005 International Conference on

Print_ISBN

0-7803-9015-6

Type

conf

DOI

10.1109/ICCCAS.2005.1495364

Filename

1495364