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AN2744 Datasheet(PDF) 32 Page - STMicroelectronics |
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AN2744 Datasheet(HTML) 32 Page - STMicroelectronics |
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32 / 56 page  Board description AN2744 32/56 Figure 27 and Figure 28 show the results for the output spectrum measurement. The EN50065-1 disturbance limits mask is traced in red. It may be compared with the typical output spectrum of the ST7538Q dual channel reference design board for each channel. Figure 26. Conducted disturbance test setup Figure 27. Output spectrum (typical) at 72 kHz channel, mains 220 VAC, fixed transmitted tone = "1" EN50065 EN50065--1 1 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 120.0 130.0 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Frequency (Hz) f C =70.8 kHz S=120.1 dBµV 2f C =141.6 kHz S=55.3 dBµV 3f C =212.4 kHz S=58.1 dBµV EN50065 EN50065--1 1 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 120.0 130.0 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Frequency (Hz) f C =70.8 kHz S=120.1 dBµV 2f C =141.6 kHz S=55.3 dBµV 3f C =212.4 kHz S=58.1 dBµV |
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