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AN2823 Datasheet(PDF) 28 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) 28 Page - STMicroelectronics

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The L5973AD in LED driving applications
AN2823
28/33
Doc ID 15015 Rev 1
Figure 27.
Maximum efficiency vs. voltage drop (ILED=350 mA)
Figure 28 shows the power losses across the resistor:
Equation 49
Figure 28.
Power losses across the sense resistor (ILED=350 mA)
Figure 29 compares the spread of the LED current when implementing the different
topologies described in theSection 2.1 and 2.2 as a function of the voltage across RS and
using the same calculations provided in Section 2.1.4 and 2.1.4.
AM01377v1
P
LOSSES
R
SENSE
I
LED
()
2
⋅
=



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