source:other news release time:2023-08-01 Hits: Popular:led screen wholesaler
LED is a device driven by current, and its brightness is proportional to the forward current. There are two methods to control the forward current.
The first method is to use the LED V-I curve to determine the voltage that needs to be applied to the LED to generate the expected forward current. The implementation method generally uses a voltage source and a ballast resistor. As mentioned below, this method has multiple shortcomings. Any change in LED forward voltage will cause a change in LED current. If the rated forward voltage is 3.6V, the current of the LED is 20mA. If the voltage changes to 4.0V, which is a specific voltage change caused by temperature or manufacturing changes, then the forward current decreases to 14mA. An 11% change in forward voltage will result in a larger forward current change of up to 30%. In addition, based on the available input voltage, the voltage drop and power consumption of the ballast resistor will waste power and reduce battery life.
The second and preferred method for LED current adjustment is to use a constant current power supply to drive the LED.
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