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AN4129 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN4129
Description  STEVAL-ILL044V1: 9 W Triac dimmable, high power factor
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4129 Datasheet(HTML) 9 Page - STMicroelectronics

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AN4129
Theory of operation
Doc ID 023314 Rev 1
9/39
Figure 6.
Voltage and current waveforms with AC injection
The current waveform at “nominal line” above, actually has the lowest harmonic content due
to the input current distortion inherent in the PFC-flyback converter. The HVLED815PF
clamps the voltage on the ILED pin between about 0.2 V on the low end, and at about 1.5 V
on the high end. If the injected waveform wants to swing below 0.2 V, the peak current in the
FET is set to zero, so no input current flows.
Figure 9.
Waveforms with 130 V input
Figure 7.
Waveforms with 90 V input
Figure 8.
Waveforms with 110 V input



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