摘要 |
<p>PURPOSE: An LED drive circuit and an LED lighting apparatus using the same are provided to maintain a constant current by controlling the total of a switching current, an LED current, and a drawing current. CONSTITUTION: An LED current detecting unit(3) detects an LED current. A first subtracting unit subtracts a predetermined value from an output of a switching current detecting unit(2). A first determination unit determines a target value limiting the switching current by calculating a voltage inputted from the outside. A second subtracting unit subtracts the predetermined value from the output of the LED current detecting unit. A second determination unit detects the target value of the LED current by calculating the voltage inputted from the outside.</p> |