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AN2946 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN2946
Description  Solar-LED streetlight controller with 25 W LED lamp driver
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2946 Datasheet(HTML) 20 Page - STMicroelectronics

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Hardware design
AN2946
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Doc ID 15473 Rev 2
Figure 23.
LED current, efficiency vs. LED voltage
LED current is constantly regulated with different lamp and battery voltages. The measured
efficiency is around 82%. The efficiency is not high when compared to a buck converter, but
it can keep LED current constant for a large input voltage range. Figure 24 and 25 show
some typical waveforms for LED drivers.
Figure 26.
Vgs, Ids, and Vds on Q4
Figure 24.
Driver input current
Figure 25.
Driver output current



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