| 摘要 |
<p>PURPOSE: An LED driver is provided to detect the emitter voltage of a sink transistor and to control the output voltage of the LED driver. CONSTITUTION: A boost driver(20) supplies a forward voltage to an anode of LED string. A transistor is connected in a cathode of the LED string and interval of a base voltage source. A feedback controller(10) senses an emitter voltage of transistor. The feedback controller performs feed-back control on the boost driver. The feedback controller compares the emitter voltage of transistor with a predetermined reference voltage.</p> |
