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Conference Paper
Single-Inductor Multiple-Output (SIMO) Switching Converter with Constant Time Control using Hysteresis Comparators
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- Authors
- Jimin Oh, Jung-Hee Suk, Sangkyun Lee, Yilsuk Yang
- Issue Date
- 2016-02
- Citation
- 한국 반도체 학술 대회 (KCS) 2016, pp.1-1
- Language
- English
- Type
- Conference Paper
- Abstract
- Many researchers have worked with single-inductor multiple-output (SIMO) converters since the SIMO converter with Time-Multiplexing control (TMC) are appeared in [1]. TMC has several disadvantages that it increases swithcing numbers with increasing output numbers and limits a high current driving. To overcome these characteristics, in Ref. [2], Ordered Power-Distributive control (OPDC) is appeared in 2007 and has advantages of reducing numbers of error amplifier and decreasing numbers of switching for current control. On the other hands, a cross regulation (CR) phenomena happens in OPDC. The well-suppresed CR is required in recent SIMO converter [3]. In this paper, constant time control is adapted in 3 output step-up DC-DC converter in Fig. 1. In Ref. [3], switching time for each output is varied and affected with other output conditions. This means that if one ouput is changed with increasing(or decreasing) load current, swiching time of the other outputs are affected and CR phenomena happen eventually. The constant time control affects unchanged outputs maintain constantly. With this control, an effect of a load variation in output 1 (Vo1) does not apeared in the others, output 2,3 (Vo2, Vo3). The CR phenomena in output 2,3 is nothing to happen and three outputs are well-regulated at each reference voltages
- KSP Keywords
- Constant time, Cross Regulation, Current Control, Error amplifier, High current, Load Variation, Load current, SIMO converter, Single inductor, Step-up DC-DC converter, Switching time