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AN4130 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN4130
Description  LED driver using the HVLED815PF
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4130 Datasheet(HTML) 27 Page - STMicroelectronics

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AN4130
Design guidance
Doc ID 023315 Rev 1
27/41
Figure 32.
Simplified LISN diagram
Differential impedance in the noise spectrum (150 kHz to 30 MHz) is 100
Ωline-to-line, 50 Ω
line-to-ground.
We design for peak noise at the FCC limit at 150 kHz. The design leaves some margin due
to the frequency selection. Peak-to-peak of the 2 mVrms limit is about 6 mV per line relative
to ground.
Figure 33.
Conducted EMI limits
The typical differential filter consists of 4 components. Starting at the noise source, these
are:
●
Shunt capacitor on the converter input (C3)
●
Series inductor (L1)
●
Shunt capacitor across line (C2)
●
Line impedance (in the LISN, about 100
Ω line-to-line at measurement frequencies).



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