Analog Devices DC2745A Demo Manual page 3

EMI TEST RESULTS
Radiated EMI Performance (CISPR25 Radiated
Emisions Test with Class 5 Peak Limits)
50
HORIZONTAL POLARIZATION
45
PEAK DETECTOR
40
35
30
25
20
15
10
5
0
0 100 200 300 400
FREQUENCY (MHz)
DC2629A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f
Load Transient Response Forced Continuous Mode
V
SG_INPUT
2V/DIV
V
RSNS
200mV/DIV
V
OUT
50mV/DIV
3.3V TO 1.2V
IN OUT
LOADSTEP 1.2A TO 4.8A 1A/µs
CISPR25 Conducted Emisions with Class 5 Peak Limits (Voltage Method)
60
50
40
30
20
10
0
–10
–20
0 10 20 30 40
DC2745A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f
PEAK LIMIT
PEAK
500 600 700 800 900
dc2745a G02
= 2MHz
SW
dc2745a G04
20µs/DIV
DEMO MANUAL DC2745A
PEAK LIMIT
PEAK
50 60 70 80 90 100
FREQUENCY (MHz)
= 2MHz
SW
Radiated EMI Performance (CISPR25 Radiated
Emisions Test with Class 5 Peak Limits)
50
VERTICAL POLARIZATION
45
PEAK DETECTOR
40
35
30
25
20
15
10
5
0
1000 0 100 200
DC2745A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f
LTC3309A Load Regulation
1.210
V = 3.3V
IN
V
1.208
OUT
FORCED CONTINUOUS MODE
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
0.0
110
dc2745a G01
300 400 500 600 700
FREQUENCY (MHz)
= 2MHz
SW
= 1.2V
1.0 2.0 3.0 4.0 5.0 6.0
I (A)
OUT
dc2745a G05
PEAK LIMIT
PEAK
800 900 1000
dc2745a G03
Rev. 0
3