Circuit and method for LED current regulation and ripple control
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United States of America Patent
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May 15, 2018
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N/A
app pub date -
May 16, 2017
filing date -
Jul 21, 2016
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Abstract
A current source generates an output current having a nominal DC magnitude between a current output node and a reference node. The output current varies with respect to the nominal DC magnitude by a time-varying magnitude. An LED load and a sensing resistor are connected in series between the current output node and the reference node to receive at least a first portion of the output current as a load current. The load current flows through the sensing resistor and generates a sensed voltage proportional to the load current. A current regulator connected between the current output node and the reference node receives a second portion of the output current as a shunt current. The current regulator also receives the sensed voltage, and selectively increases or decreases the shunt current to reduce the effect of the time varying magnitude of the output current on the load current.
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