Texas Instruments LM5180-Q1, Руководство пользователя

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(a) (b)
Start 150 kHz Start 30 MHz Stop 30 MHz Stop 108 MHz
(a) (b)
Start 150 kHz Start 30 MHz Stop 30 MHz Stop 108 MHz
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Test Data and Performance Curves
13 SNVU592D – July 2018 – Revised April 2020
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LM5180-Q1 Single-Output EVM User's Guide
6.5 CISPR 25 EMI
Figure 13 and Figure 14 present the EMI performance of the LM5180-Q1 EVM at 12-V and 24-V inputs,
respectively. Conducted emissions are measured over a frequency range of 150 kHz to 108 MHz using a
5-µH LISN according to the CISPR 25 specification. CISPR 25 class 5 peak and average limit lines are
denoted in red. The yellow and blue spectra are measured using peak and average detection,
respectively.
Figure 13. CISPR 25 Class 5 Conducted Emissions Plot, V
IN
= 12 V, I
OUT
= 0.85 A, (a) 150 kHz to 30 MHz,
(b) 30 MHz to 108 MHz
Figure 14. CISPR 25 Class 5 Conducted Emissions Plot, V
IN
= 24 V, I
OUT
= 0.85 A, (a) 150 kHz to 30 MHz,
(b) 30 MHz to 108 MHz
Figure 15 presents the radiated emissions from 30 MHz to 1 GHz using a biconical/log antenna with
horizontal polarization. CISPR 25 class 5 peak and average limit lines are denoted in purple and red,
respectively. The blue and green spectra are measured using peak and average detectors, respectively.