Abstract
Abstract This paper describes various steps followed to design a multi-output low voltage power supply that can operate in a 240°C ambient temperature within a downhole oil exploration tool. The following aspects of the design are considered in detail–circuit topology selection, use of simulation tools to validate the topology, component selection for operation at extreme temperature, component testing and failure analysis, multichip module (MCM) packaging selection, MCM package mounting methodologies, application of thermal stress analysis in circuit layout, reliability assessment and validation testing. This paper provides a step-by-step analysis of the above tasks that must be performed in an iterative manner to achieve a reliable power supply design that can operate at 240°C.
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