Constant current regulator with current sensing circuit loop
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United States of America Patent
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Jan 26, 2010
Grant Date -
Feb 26, 2009
app pub date -
Oct 15, 2007
filing date -
Aug 24, 2007
priority date (Note) -
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Abstract
A constant current regulator includes a current sensing circuit loop connected to a switch unit of the constant current regulator to detect a current flowing through the switch unit and to generate a detection current that is in proportion to the current flowing through the switch unit. The detection current flows through a detection resistor to induce a detection voltage. A differential amplifier bases on a set voltage and the received detection voltage to generate an error voltage to a pulse width modulation controller, which in turn causes a gate driver circuit to control the switching operation of the switch unit thereby supplying a constant current to a load connected to an output voltage of the regulator.
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