Analog Devices LTC3308A Demo Manual page 3

EMI TEST RESULTS
60
HORIZONTAL POLARIZATION
50
40
30
20
10
0
–10
–20
0 100 200 300 400
FREQUENCY (MHz)
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, f
Load Transient Response Forced Continuous Mode
V
SG_INPUT
2V/DIV
V
RSNS
100mV/DIV
VOUT
20mV/DIV
3.3V TO 1.2V
IN
LOAD STEP 0.8A TO 3.2A 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
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, f
Radiated EMI Performance (CISPR25 Radiated Emission Test
with Class 5 Peak Limits)
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
500 600 700 800 900
dc2991A G02
= 2MHz
SW
dc2991A G04
10µs/DIV
OUT
DEMO MANUAL DC2991A
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
40 50 60 70 80 90
FREQUENCY (MHz)
= 2MHz
SW
60
VERTICAL POLARIZATION
50
40
30
20
10
0
–10
–20
1000 0 100 200
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, f
LTC3308A Load Regulation
1.210
V
1.208 V
FORCED CONTINUOUS MODE
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
0.0
100 110
dc2991A G01
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
300 400 500 600 700
FREQUENCY (MHz)
= 2MHz
SW
= 3.3V
IN
= 1.2V
OUT
0.5 1.0 1.5 2.0 2.5 3.0 3.5
I (A)
OUT
dc2991A G05
800 900 1000
dc2991A G03
4.0
Rev. 0
3