Process and circuitry for controlling a load
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United States of America Patent
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Feb 25, 2014
Grant Date -
Sep 23, 2010
app pub date -
Mar 4, 2010
filing date -
Mar 17, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A current source and an associated method for supplying current to a load such as an arrangement of LEDs. The intensity of the supplied current varies as a function of the temperature of the load. The intensity of the current is temperature-dependent and limited to a predefined maximum. The temperature dependence is achieved by the component parts that are used without the help of special temperature sensors. The current source is supplied with a reference voltage derived from an integrated circuit. The reference voltage is tapped from a port of the IC and therefore it is switchable. The reference voltage is used to produce a control current, which is fed through a driver stage to produce the current of the current source. Elements in the current source limit the current's intensity and change it as a function of temperature.
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