| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an LED lighting control circuit capable of controlling an output current for driving the LED so that the output power of the LED may fall in a specific range in accordance with Vf variation of the LED, and a vehicle lamp fixture equipped with the same. <P>SOLUTION: The LED lighting control circuit 10 is provided for instance with a direct current power source with a battery as input and a transformer 16 connected with the direct current power source, a voltage detecting part 18 for detecting an output voltage of a plurality of LED light sources 14, a current detecting part 20 for detecting an output current of the LED lighting sources 14, a calculating part 22 for establishing a current value for driving the LED light sources 14 base on the output current voltage value detected by the voltage detecting part 18, a PWM controlling part 24 for controlling the output current for driving the LED light sources 14 from the output current value of the current detecting part 20 and the established current value by the calculating part 22, and an FET driver 26 for switching on and off the switching element Q1 by a signal of the PWM controlling part 24. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
