SLAA856A Application note

SLAA856A July 2018 – July 2021 TAS5825M

4.2 EN55022 Conducted Emission Results

TAS58x5M EMI Test Board, ferrite bead filter, BD modulation, PVDD = 12 V, 8 Ω + 56 uH load, Spread Spectrum enabled, Fsw = 384 kHz, Po = 4 W per channel.

Figure 4-5 Conducted Emission – Line Pre-Scan – BC Filter

Table 4-5 Conducted Emission Margins – Line – BC Filter

NO.	Frequency [MHz]	Corr. Factor [dB]	QP Limit [dBµV]	AV Limit [dBµV]	AV Reading [dB]	AV Margin [dB]	QP Reading [dBµV]	QP Margin [dB]
1	0.16564	9.60	65.18	55.18	23.85	-21.73	40.34	-15.24
2	0.43152	9.60	57.22	47.22	27.66	-9.96	34.40	-13.22
3	1.19550	9.60	56.00	46.00	22.95	-13.45	29.89	-16.51
+4	4.82398	9.63	56.00	46.00	27.57	-8.80	34.06	-12.31

Figure 4-6 Conducted Emission – Neutral Pre-Scan – BC Filter

Table 4-6 Conducted Emission Margins – Neutral – BC Filter

NO.	Frequency [MHz]	Corr. Factor [dB]	QP Limit [dBµV]	AV Limit [dBµV]	AV Reading [dB]	AV Margin [dB]	QP Reading [dBµV]	QP Margin [dB]
1	0.15000	9.60	66.00	56.00	23.32	-23.08	42.96	-13.44
2	0.41979	9.60	57.45	47.45	25.92	-11.93	32.88	-14.97
+3	4.82398	9.63	56.00	46.00	26.94	-9.43	33.55	-12.82

TAS58x5M EMI Test Board, inductor filter, PVDD = 12 V, BD modulation, 8 Ω + 56 uH load, Spread Spectrum disabled, Fsw = 768 kHz, Po = 4 W per channel.

Figure 4-7 Conducted Emission – Line Pre-Scan – LC Filter

Table 4-7 Conducted Emission Margins – Line – LC Filter

NO.	Frequency [MHz]	Corr. Factor [dB]	QP Limit [dBµV]	AV Limit [dBµV]	AV Reading [dB]	AV Margin [dB]	QP Reading [dBµV]	QP Margin [dB]
+1	0.70522	10.40	56.00	46.00	19.28	-16.32	21.29	-24.31
2	19.02819	10.80	60.00	50.00	19.77	-19.43	26.74	-22.46

Figure 4-8 Conducted Emission – Neutral Pre-Scan – LC Filter

Table 4-8 Conducted Emission Margins – Neutral – LC Filter

NO.	Frequency [MHz]	Corr. Factor [dB]	QP Limit [dBµV]	AV Limit [ dBµV]	AV Reading [dB]	AV Margin [dB]	QP Reading [dBµV]	QP Margin [dB]
+1	0.70522	10.40	56.00	46.00	19.68	-15.92	21.69	-23.91
2	19.03210	10.90	60.00	50.00	19.44	-19.66	26.42	-22.68