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A power-switch thermal limiting technique for current-mode monolithic DC-DC converters.
- Source :
-
AEU: International Journal of Electronics & Communications . Nov2019, Vol. 111, pN.PAG-N.PAG. 1p. - Publication Year :
- 2019
-
Abstract
- This paper presents a power-switch thermal limiting technique for peak current-mode DC-DC converters to achieve maximized load current deliverability under a fixed thermal constraint. The inductor current limit of the converter is adaptively set based on the sensed switching duty-cycle to maintain a fixed power consumption limit across a wide input voltage range. The proposed current limiting circuit exhibits a fast-transient response and the chances of power-switch overheating is minimized. Since the temperature rise of the converter chip is also a function of the heat-conduction conditions such as the package type, the PCB layout, and the ambient temperature, the proposed architecture allows the power limit to be adjustable through a single off-chip resistor. Compared with a conventional switching converter which sets the inductor current limit to be constant across the entire input voltage range, the proposed approach achieves a higher available load current, especially with a higher input voltage under the same thermal constraint. In the proposed boost converter with an allowable temperature rise of 40 ° C , the proposed converter achieved 46% more available load current compared with the conventional one at the highest input voltage. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HIGH voltages
*DC-to-DC converters
*ELECTRIC potential
Subjects
Details
- Language :
- English
- ISSN :
- 14348411
- Volume :
- 111
- Database :
- Academic Search Index
- Journal :
- AEU: International Journal of Electronics & Communications
- Publication Type :
- Academic Journal
- Accession number :
- 139191888
- Full Text :
- https://doi.org/10.1016/j.aeue.2019.06.022