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UM1955 Fiches technique(PDF) 13 Page - STMicroelectronics

No de pièce UM1955
Description  Getting started with the multifunctional expansion board based on operational amplifiers for STM32 Nucleo
PDF  28 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1955 Fiches technique(HTML) 13 Page - STMicroelectronics

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UM1955
LED driver configuration
28
6
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



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