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Thermal protection of Smart Power ICs in case of overload or short circuit requires a dynamic hot spot temperature measurement of the power switch. In most integrated Smart Power technologies however, the hot spot of the Power DMOS is not easily accessible by a sensor structure. This paper shows that the usual placement of the temperature sensor at the edge of the power switch leads to significant...
Automotive power applications based on Smart Power ICs require the knowledge of dynamic DMOS temperature for optimum system design and reliability. An indirect method is presented here that combines a simple theoretical model of heat conduction for short pulses with data from destruction time and energy measurements obtained during necessary destructive testing of integrated DMOS power switches. The...
In the development of smart power products for automotive applications, robustness to all kinds of disturbances is one of the key issues. For junction-isolated smart power technologies such as SPT1, negative voltages at the drain terminal of a power DMOS lead to minority carrier injection into the substrate. This can cause malfunction of sensitive circuits such as bandgap references and may subsequently...
A CMOS DC/DC converter circuit, the ISDN Remote Power Controller (IRPC), especially designed for telecommunication environments, is described. The device is fully compatible to the CCITT power recommendations on the S-interface. The IRPC is an integrated pulse width modulator circuit, designed for fixed-frequency switching regulators with several additional ISDN-specific features. By this new circuit...
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