Analog Devices DC2468A, Demo Manual

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dc2468af
DEMO MANUAL DC2468A
DC2468A DEMO BOARD
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
= 2MHz
FIXED FREQUENCY MODE
SPREAD SPECTRUM MODE
FREQUENCY (MHz)
0 3 6 9 12 15 18 21 24 27 30
–40
–30
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµ
V/m)
dc2468 F04a
Conducted EMI Performance
Radiated EMI Performance
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
VERTICAL POLARIZATION
PEAK DETECTOR
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0 100 200 300 400 500 600 700 800 900 1000
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµ
V/m)
dc2468 F04b
DC2468A DEMO BOARD
(WITH EMI FILTER INSTALLED)
14V INPUT TO 5V OUTPUT AT 4A, f
SW
= 2MHz
HORIZONTAL POLARIZATION
PEAK DETECTOR
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0 100 200 300 400 500 600 700 800 900 1000
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµ
V/m)
dc2468 F04c
Figure 4. LT8645S Demo Circuit DC2468A EMI Performance (14V Input from VEMI, with EMI Filter, I
OUT
= 4A)
DESCRIPTION