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UM1955

LED driver configuration

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LED driver configuration

The LED driver configuration allows users to drive an LED with a constant current. As

shown in Figure 7, when the forward voltage varies, the current and thus the light intensity is

highly variable.

Figure 7. Forward current vs. forward voltage

This is why it is recommended to control the LED by current, and thus this architecture is

useful.

6.1

Schematic diagram

Figure 8 shows the circuit schematic of the LED driver configuration.

Figure 8. LED driver configuration circuit schematic