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Electromagnetic Interference (EMI) www.ti.com
In order to get a quick estimate of the EMI filter performance, only the PEAK conductive EMI scan was
measured and the data was compared to the Class B conducted EMI limits published in FCC – 47, section
15.
Figure 19. Peak Conductive EMI Scan per CISPR-22, Class B Limits
If an additional 33nF of input capacitance (C6) is utilized in the input filter, the EMI conductive
performance is further improved as shown in Figure 20.
Figure 20. Peak Conductive EMI Scan With Additional 33nF of Input Capacitance
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AN-2082 LM3444 -120VAC, 8W Isolated Flyback LED Driver SNVA454E–September 2010–Revised May 2013
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