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AN2823 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN2823
Description  Current source for LED driving based on the L5973AD
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2823 Datasheet(HTML) 5 Page - STMicroelectronics

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AN2823
Basic principles of LED driving
Doc ID 15015 Rev 1
5/33
Figure 4.
Basic schematic of a DC-DC converter driving LEDs
The main drawback of the circuit shown in Figure 4 is the amount of wasted power on the
sense resistor. This can affect the efficiency of the overall application, especially in cases
where the voltage reference of the embedded error amplifier is not negligible compared to
the voltage drop across the LEDs, or when high current devices are used.
The main objective of this document is to implement a more efficient current source by
converting the voltage loop of a monolithic DC-DC converter into a current loop.
AM01354v1



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