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L4984D Datasheet(PDF) 20 Page - STMicroelectronics

Part # L4984D
Description  CCM PFC controller
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4984D Datasheet(HTML) 20 Page - STMicroelectronics

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Application information
L4984D
20/35
DocID024474 Rev 1
Figure 29. Line-modulated fixed-off-time-controlled boost PFC: input current
harmonic contents
The waveform relevant to Vin = 264 Vac shows the highest degree of distortion and the
largest portion of the line cycle where boost inductor operates in discontinuous mode
(DCM). However, its harmonic content, shown in Figure 29, is still so low that it is not an
issue for EMC compliance. Almost all the distortion is concentrated in the third harmonic,
whose amplitude is 17% of the fundamental one, while the THD is 17.7%.
AM13245v1
Vin = 264Vac
THD = 17.7%
Harmonic order (n)



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