SLAA856A Application note

SLAA856A July 2018 – July 2021 TAS5825M

4.1 EN55022 Radiated Emission Results

TAS58x5M EMI Test Board, ferrite bead filter, BD modulation, PVDD = 12 V, 8 Ω + 56 uH load, 105 cm speaker cables, Spread Spectrum enabled, Fsw = 384 kHz, Po = 4 W per channel.

Figure 4-1 Radiated Emission - Horizontal Pre-Scan - BC Filter

Table 4-1 Radiated Emission Margins – Horizontal – BC Filter

NO.	Frequency [MHz]	Reading [dBµV/m]	Factor [dB]	Limit [dBµV/m]	Margin [dB]	Height [cm]	Level [dBµV/m]	Angle [°]
1	174.530	41.71	-15.10	40.00	13.39	200	26.61	259
2	222.545	47.31	-16.76	40.00	9.45	100	30.55	243
3	287.050	48.19	-14.52	47.00	13.33	100	33.67	313

Figure 4-2 Radiated Emission - Vertical Pre-Scan - BC Filter

Table 4-2 Radiated Emission Margins – Vertical – BC Filter

NO.	Frequency [MHz]	Reading [dBµV/m]	Factor [dB]	Limit [dBµV/m]	Margin [dB]	Height [cm]	Level [dBµV/m]	Angle [°]
1	30.000	51.99	-16.04	40.00	4.05	100	35.95	252
2	33.880	50.44	-16.05	40.00	5.61	100	34.39	61
3	44.550	44.66	-15.73	40.00	11.07	100	28.93	20
4	49.885	41.32	-15.36	40.00	14.04	100	25.96	233
5	179.380	37.47	-15.52	40.00	18.05	100	21.95	142
6	282.685	40.74	-14.68	47.00	20.94	200	26.06	356

TAS58x5M EMI Test Board, inductor filter, BD modulation, PVDD = 12 V, 8 Ω + 56 uH load, 105 cm speaker cables, Spread Spectrum disabled, Fsw = 768 kHz, Po = 4 W per channel.

Figure 4-3 Radiated Emission - Horizontal Pre-Scan - LC Filter

Table 4-3 Radiated Emission Margins – Horizontal – LC Filter

NO.	Frequency [MHz]	Reading [dBµV/m]	Factor [dB]	Limit [dBµV/m]	Margin [dB]	Height [cm]	Level [dBµV/m]	Angle [°]
1	67.345	39.94	-16.77	40.00	16.83	200	23.17	352
2	101.295	41.42	-18.36	40.00	16.94	200	23.06	247
3	174.045	40.71	-15.06	40.00	14.35	200	25.65	45
4	225.455	46.07	-16.70	40.00	10.63	100	29.37	254
5	288.990	49.26	-14.46	47.00	12.20	100	34.8	223

Figure 4-4 Radiated Emission - Vertical Pre-Scan - LC Filter

Table 4-4 Radiated Emission Margins – Vertical – LC Filter

NO.	Frequency [MHz]	Reading [dBµV/m]	Factor [dB]	Limit [dBµV/m]	Margin [dB]	Height [cm]	Level [dBµV/m]	Angle [°]
1	30.970	42.84	-16.05	40.00	13.21	100	26.79	278
2	37.275	36.85	-16.04	40.00	19.19	100	20.81	281
3	67.345	39.20	-16.77	40.00	17.57	200	22.43	204
4	181.320	37.34	-15.70	40.00	18.36	100	21.64	148
5	294.810	43.37	-14.25	47.00	17.88	100	29.12	278