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AN2946 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

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AN2946 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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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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