Texas Instruments LM73605, Руководство пользователя, Страница: 16 / 22

V
OUT
Ripple
V
SW
(1 A/DIV)
Time (500 µs/DIV)
I
INDUCTOR
(20 mV/DIV)
(5 V/DIV)
CISPR22 ClassA
CISPR22 ClassB
CISPR25 Class5
V
OUT
Ripple
V
SW
(1 A/DIV)
Time (500 µs/DIV)
I
INDUCTOR
(20 mV/DIV)
(5 V/DIV)
Peak Value
Average Value
LW_PK5
CB_PK5
LW_AV5
MW_PK5
MW_AV5
SW_PK5
SW_AV5
CB_AV5
Peak Value
Average Value
VHF1-PK5
VHF2-PK5
TVI-PK5
FM-PK5
VHF1-AV5
VHF2-AV5
TVI-AV5
FM-AV5
Performance Curves
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16 SNVU579 – September 2017
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LM73605 / LM73606 EVM User’s Guide
7.4 EMI Test Results
The following results were obtained in TI labs for reference only. The radiated EMI test was performed in a
3-meter standard lab. The input filter values used for this test is shown in
Table 6 . The input filter consists
of C-FLTs, L-IN and CBULK, located on the bottom side of the PCB. Note that the input filter components
are not mounted on the PCB by default.
Table 6. EMI Filter Component Values
Component C-FLTs L-IN CBULK
Value 4.7 µF ceramic capacitor 1 µH 10 µF electrolytic capacitor
Quantity 4 1 1
Figure 28. LM73605 400-kHz Board Conducted EMI Result
vs CISPR25 Limits, with I
OUT
= 4 A - Low Frequency
Figure 29. LM73605 400-kHz Board Conducted EMI Result
vs CISPR25 Limits, with I
OUT
= 4 A - High Frequency
Figure 30. LM73605 400-kHz Board Radiated EMI Result vs CISPR25 Limits, with I
OUT
= 4 A