Fixed Bias Voltage and Current-limiting Resistor Drive LED Circuit

Published:2011/6/19 6:51:00 Author:Michel | Keyword: Fixed Bias Voltage, Current-limiting Resistor, Drive, LED Circuit | From:SeekIC

In the application of white LED the most obvious problems is the matching differences of the product.According to white LED typical specifiactions,when the current is 20mA,the minimum value of the forward voltage is 3.5V and the maximum value is 4.0V.Obviously, constant voltage source is not reasonable solution.The same current drives every LED, which can get brightness but the cost is high.Most applications are simply using fixed bias voltage and current limit resistance to obtain approximate matching white LED brightness and it is showed as above. Picture:Fixed Bias Voltage and Current-limiting Resistor Drive LED Circuit



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