Table of Contents
Advertisement
APPLICATIONS INFORMATION
Figures 5 and 6 are CISPR radiated and conducted
emissions respectively. The data were collected in a
GTEM chamber and using a CISPR25 LISN for conducted
emissions. The EMI tests were conducted using a 12V
+
input on V
, V
connected to V
IN_P
OUT
demo board, and a 600Ω resistor load between LDO
50
40
30
20
10
0
–10
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
V
= 12V, V
IN
OUT
WITHOUT C1 INSTALLED
V
= 12V, V
IN
OUT
WITH C1 = 10 F
CISPR22 LIMIT LINE
Figure 5. CISPR22 Radiated Emissions
via SW1 of the
IN_N
+
dc2235 F05
= ±15V, 600 LOAD RESISTOR
= ±15V, 600 LOAD RESISTOR
DEMO MANUAL DC2235A
–
LDO
in constant-frequency mode with a 500kHz oscillator
frequency. Linear Technology has made every effort to
provide useful and accurate EMI data, but it remains the
responsibility of the customer to ensure product compli-
ance with applicable rules and regulations.
and
110
100
90
80
70
60
50
40
30
20
10
0
100k
Figure 6. CISPR25 Conducted Emissions
1M
10M
100M
FREQUENCY (Hz)
dc2235a F06
V
= 12V, V
= ±15V, LOAD = 600
IN
OUT
WITHOUT C1 INSTALLED
V
= 12V, V
= ±15V, LOAD = 600
IN
OUT
WITH C1 = 10 F
CISPR25 LIMITS FOR BROADBAND
CONDUCTED DISTURBANCES ON POWER
INPUT TERMINALS PEAK LIMIT (CLASS 3)
dc2235af
5
Advertisement
Table of Contents
Need help?
Do you have a question about the DC2235A and is the answer not in the manual?
Questions and answers