3
DC3054A-C
Rev. 0
EMI TEST RESULTS
CISPR25 Conducted Emissions with Class 5 Peak Limits (Voltage Method)
Radiated EMI Performance (CISPR25 Radiated
Emissions Test with Class 5 Peak Limits)
Radiated EMI Performance (CISPR25 Radiated
Emissions Test with Class 5 Peak Limits)
DC3054A–C DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.8V OUTPUT AT 4.8A, f
SW
= 6.6MHz
CLASS 5 PEAK LIMIT
MEASURED DATA
AMBIENT NOISE
FREQUENCY (MHz)
0
10
20
30
40
50
60
70
80
90
100
110
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµ
V/m)
(CISPR25 Conducted Emission Test with Class 5 Peak Limits)
dc3054a-c G01
DC3054A–C DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.8V OUTPUT AT 4.8A, f
SW
= 6.6MHz
HORIZONTAL POLARIZATION
CLASS 5 PEAK LIMIT
MEASURED DATA
AMBIENT NOISE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµ
V/m)
dc3054a-c G02
DC3054A–C DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.8V OUTPUT AT 4.8A, f
SW
= 6.6MHz
VERTICAL POLARIZATION
CLASS 5 PEAK LIMIT
MEASURED DATA
AMBIENT NOISE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµ
V/m)
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
dc3054a-c G03
Load Transient Response Forced Continuous Mode
3.3V
IN
TO 1.8V
OUT
LOADSTEP 1.2A TO 4.8A 1A/µs
10µs/DIV
V
SG
2V/DIV
V
OUT
50mV/DIV
V
RSNS
200mV/DIV
dc3054ac G04
LTC3309B Load Regulation
V
IN
= 3.3V
V
OUT
= 1.8V
FORCED CONTINUOUS MODE
I
OUT
(A)
0
1
2
3
4
5
6
V
OUT
(V)
dc3054ac G05
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
1.803
1.804
1.805
