Analog Devices DC2468A Demo Manual page 3

DESCRIPTION
Figure 4. LT8645S Demo Circuit DC2468A EMI Performance (14V Input from VEMI, with EMI Filter, I
Conducted EMI Performance
60
50
40
30
20
10
0
–10
–20
–30
–40
0 3 6 9 12
FREQUENCY (MHz)
DC2468A DEMO BOARD
(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)
DC2468A DEMO BOARD
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
DEMO MANUAL DC2468A
FIXED FREQUENCY MODE
SPREAD SPECTRUM MODE
15 18 21 24 27 30
dc2468 F04a
= 2MHz
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
600 700 800 900 1000
dc2468 F04b
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
600 700 800 900 1000
dc2468 F04c
= 2MHz
= 4A)
OUT
dc2468af
3