Abstract
In the course of the development of hybrid voltage regulators for automobile use, increasing the reverse blocking voltage with decreasing of saturation voltage for output power darlington transistors, the capability of monolithic IC chip against surge pulses generated in cars, and an improvement of the pattern design of thick film in order to withstand temperature cycling, have been important subjects. Power darlingtons have more than 150 V of reverse voltage as well as large secondary breakdown capacity and less than 1.2 V of saturation voltage. A monolithic chip having small saturation voltage and more than 500 mA of surge current capability, has been developed. A neck-shaped thick film pattern was developed to make soldering in a controlled manner. The problems in the earlier stage with surge current and temperature cycling have been almost solved by these improvements.In this paper the characteristics of the transistor and the monolithic chip the structure of the device and related problems observed in temperature cycling are described.
Highlights
A hybrid voltage regulator for automobile use was developed ten years ago in Sanken Electric and at present the regulators are in mass production with the aid of semiconductor technology improvement, such as the success of flip-chip small signal device and well-passivated solderable high power transistor
Since all the problems have been settled at present, the mechanical regulators would be totally replaced by the electronic counterparts in the very near future because of their small size, light weight, high current capability, free from maintenance and high reliability
The circuit consists of just four elements except for resistors, DTr, Ds, MIC, and Cn
Summary
A hybrid voltage regulator for automobile use was developed ten years ago in Sanken Electric and at present the regulators are in mass production with the aid of semiconductor technology improvement, such as the success of flip-chip small signal device and well-passivated solderable high power transistor. In spite of rather long history IC regulators just started to replace conventional mechanical regulators three years ago. The reason of the delay would be due to low reliability expected and expensiveness. Since all the problems have been settled at present, the mechanical regulators would be totally replaced by the electronic counterparts in the very near future because of their small size, light weight, high current capability, free from maintenance and high reliability
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