Overcurrent Protection in DC/DC Converters – An Overview
نویسنده
چکیده
Fault protection is commonly available in most of power management chips to date and its accuracy highly praised, mainly in cases where driving rates reach a few Amperes, or even above. In this paper, some of most common techniques for overcurrent protection (OCP) applied to both switching and linear DC/DC supply voltages are revisited and their trade-offs analyzed. Current limitation approaches based on sense resistors and sense FETs are described, with special emphasis on circuits that present high immunity to process, voltage and temperature (PVT) variation. Simulation data are provided for distinct approaches, as well as experimental results for a fast-response current limiter with internal compensation against process and temperature (PT) spread. keywords: Current Sensor, Current Limiter, DC/DC Converters, Power Management
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