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AN4376 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN4376
Description  10 W wide range non-isolated high power factor LED driver using HVLED815PF
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4376 Datasheet(HTML) 7 Page - STMicroelectronics

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DocID025380 Rev 1
7/37
AN4376
Theory of operation
37
Waveforms are represented in case of transition operating mode that is on the boundary
between continuous and discontinuous conduction mode, this is the most efficient and an
easy way to design EMI compliant low power single-stage LED drivers.
Figure 6 and Figure 7 represent the split current.
To design a single-stage LED driver with a high power factor it is enough to modulate the
peak current of Figure 5 with a sinusoidal reference like in a common PFC in order to put
the input voltage with input current into phase.
Figure 6. TM (transition mode) flyback
waveforms
Figure 7. TM (transition mode) buck-boost
waveforms



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