NDLI: Low temperature evaluation of bipolar- and CMOS-based current-mode PWM controllers

Content Provider	IEEE Xplore Digital Library
Author	Elbuluk, M.E. Gerber, S. Harnmoud, A. Patterson, R.L. Newell, M.
Copyright Year	2002
Description	Author affiliation: Dept. of Electr. Eng., Akron Univ., OH, USA (Elbuluk, M.E.)
Abstract	Two commercial-off-the-shelf (COTS) current-mode controller integrated circuits (ICs), with potential use in the development of a low temperature DC/DC converter, were evaluated at cryogenic temperatures. The design of the two ICs is identical but one is bipolar-based and the other is CMOS-based. Both ICs are capable of high frequency switching (200-500 kHz) and are specified for operation in the temperature range of 0 /spl deg/C to +70 /spl deg/C. Two separate circuit boards utilizing these controllers were built and evaluated in the temperature range of +20 /spl deg/C to -185 /spl deg/C. The performance of each controller in terms of its switching frequency and duty cycle control was evaluated as a function of temperature. Under short-time exposure to low temperature, the bipolar-based IC displayed good operational behavior with temperature only down to -110 /spl deg/C. Beyond that temperature, the device lost its functionality but recovered when higher temperatures were introduced. Nonetheless, the low temperature limit of -110 /spl deg/C by far exceeds the manufacturer's temperature specification of the device. The CMOS-based current-mode controller, on the other hand, displayed good operational behavior down to -185 /spl deg/C. While slight changes were observed in some of the device parameters upon exposure to low temperature; no significant impact, however, resulted on its overall performance.
Sponsorship	IEEE ice SICE Univ. Sevilla
Starting Page	456
Ending Page	461
File Size	426766
Page Count	6
File Format	PDF
ISBN	0780374746
DOI	10.1109/IECON.2002.1187551
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-11-05
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Temperature control Pulse width modulation converters CMOS technology Space technology DC-DC power converters NASA Integrated circuit technology Cryogenics Temperature distribution
Content Type	Text
Resource Type	Article

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