Analog Devices Linear Technology 2658A Demo Manual page 3

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Conducted EMI Performance
60
50
40
30
20
10
0
–10
–20
–30
–40
0 3 6 9 12
FREQUENCY (MHz)
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
Radiated EMI Performance
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
50
VERTICAL POLARIZATION
45
PEAK DETECTOR
40
35
30
25
20
15
10
5
0
–5
0 100 200 300 400 500
FREQUENCY (MHz)
50
HORIZONTAL POLARIZATION
45
PEAK DETECTOR
40
35
30
25
20
15
10
5
0
–5
0 100 200 300 400 500
FREQUENCY (MHz)
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
Figure 3. LT8643S Demo Circuit DC2658A EMI Performance
(14V Input from V , with EMI Filter, I
IN_EMI
DEMO MANUAL DC2658A
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
15 18 21 24 27 30
DC2658 F03a
= 2MHz
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
600 700 800 900 1000
DC2658 F03b
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
600 700 800 900 1000
DC2658 F03c
= 2MHz
= 4A)
OUT
dc2658af
3