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AN2983 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2983
Description  Constant current inverse buck LED driver using L6562A
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2983 Datasheet(HTML) 6 Page - STMicroelectronics

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Circuit description
AN2983
6/32
Doc ID 15679 Rev 1
2
Circuit description
The following is a list of the main components that form the module EVL6562A-LED.
●
Power section
●
L6562A controller
●
Fixed off time (FOT) delay
●
Current setting
●
LED number compensation
●
Shutdown/dimming
●
Auxiliary power
●
Open-/short-circuit protection
Figure 3.
Module schematic
2.1
Power section
The topology of this stage is the so-called inverse buck (also referred to as modified or low-
side buck). Simply stated, it is a standard buck converter with the power and ground
connections interchanged, as shown in Figure 4 and Figure 5.



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