Emi Test Results - Analog Devices DC2990A Manual

EMI TEST RESULTS

60
HORIZONTAL POLARIZATION
50
40
30
20
10
0
–10
–20
dcXXXXa F00
0 100 200 300
DC2990A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f
Load Transient Response Forced Continuous Mode
Forced Continuous Mode
V
SG_INPUT
2V/DIV
V
RSNS
100mV/DIV
V 1.2V
OUT
20mV/DIV
3.3V TO 1.2V
IN
LOADSTEP 0.6A TO 2.4A 1A/µs
Conducted EMI Performance (CISPR25 Conducted Emission Test
with Class 5 Peak Limits)
60
50
40
30
20
10
0
–10
–20
0 10 20 30
DC2990A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f
Radiated EMI Performance (CISPR25 Radiated Emission Test
with Class 5 Peak Limits)
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
400 500 600 700 800 900
FREQUENCY (MHz)
= 2MHz
SW
dc2990a G04
10µs/DIV
OUT
DEMO MANUAL DC2990A
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
RADIATED NOISE
40 50 60 70 80
FREQUENCY (MHz)
= 2MHz
SW
60
VERTICAL POLARIZATION
50
40
30
20
10
0
–10
–20
1000
0 100
DC2990A DEMO BOARD
dc2990a G02
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
90 100 110
dc2990a G01
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
200 300 400 500 600 700
FREQUENCY (MHz)
= 2MHz
SW
LTC3307A Load Regulation
LTC3307A Load Regulation
V = 3.3V
IN
V = 1.2V
OUT
FORCED CONTINUOUS MODE
0.0 0.5 1.0 1.5 2.0
I (A)
OUT
800 900 1000
dc2990a G03
2.5 3
dc2990a G05
Rev. 0
3