Driving LED circuit diagram using fixed bias voltage and current limiting resistor
Source: InternetPublisher:toothache Keywords: LED circuit bias voltage circuit diagram current limiting resistor Updated: 2021/04/26
The most obvious problem in white LED applications is poor product matching. According to the typical specifications of white LEDs, the minimum forward voltage when the current is 20mA is 3.0V, the typical value is 3.5V, and the maximum value is 4.0V. Obviously, a voltage regulator is not a reasonable solution. Using the same current to drive each LED can achieve uniform brightness, but the cost is high. Most applications simply utilize a fixed bias voltage and current-limiting resistor to obtain approximately matched white LED brightness, as shown in the figure.
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