Current driver circuit
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United States of America Patent
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Apr 16, 2013
Grant Date -
Oct 20, 2011
app pub date -
Jun 27, 2011
filing date -
Oct 1, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
In order to provide a current driver circuit capable of achieving a stable operation without feeding a load current back, a current driver circuit of the present invention includes: a converter part (2a) having a switching element (21) and converting an input voltage (Vi) into an output voltage; a current detector (4) which generates a detection signal (Vfb) indicative of the current of the switching element; an input voltage compensating circuit (5) which generates a compensation signal (Vr) corresponding to the input voltage; a comparator (6) which compares the detection signal and the compensation signal against each other; and a switch driver circuit (7) which generates a drive signal (Vg). The drive signal (Vg) turns the switching element off in accordance with an output (Vc) of the comparator, and turns the switching element on again after a lapse of a prescribed time from the switching element being turned off.
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