TIDT317 March 2023
2.5 EMI
The conducted emissions are tested to the CISPR 25 class 5 standards. The CISPR 25 class-5 compliance was achieved without a common-mode choke. The waveforms of EMI test results are shown in following pictures.
The following images illustrate the
EMI performance from 150 kHz to 108 MHz. Additionally, in every image:
Line 1: CISPR 25 Class 5 peak limits; Line 2: CISPR 25
Class 5 average limits;
Line 3: Peak detection result;
Line 4: Average detection result.
Figure 2-10 EMI Performance, 13.5-V Input,
5-V, 3-A Load, Positive Line
Figure 2-11 EMI Performance, 13.5-V Input,
5-V, 3-A Load, Negative Line
Figure 2-12 EMI Performance, 13.5-V Input,
9-V, 3-A Load, Positive Line
Figure 2-13 EMI Performance, 13.5-V Input,
9-V, 3-A Load, Negative Line
Figure 2-14 EMI Performance, 13.5-V Input,
15-V, 3-A Load, Positive Line
Figure 2-15 EMI Performance, 13.5-V Input,
15-V, 3-A Load, Negative Line
Figure 2-16 EMI Performance, 13.5-V Input,
20-V, 3-A Load, Positive Line
Figure 2-17 EMI Performance, 13.5-V Input,
20-V, 3-A Load, Negative LineThe margin of each EMI test result is shown in the following table.
Table 2-2 EMI Test Results
| VIN (V) | VOUT (V) | Measurement Line | Margin (dB) |
|---|---|---|---|
| 13.5 | 5 | Positive line | 13.1 |
| 13.5 | 5 | Negative line | 13.1 |
| 13.5 | 9 | Positive line | 8.7 |
| 13.5 | 9 | Negative line | 8.5 |
| 13.5 | 15 | Positive line | 6.6 |
| 13.5 | 15 | Negative line | 6.6 |
| 13.5 | 20 | Positive line | 8.6 |
| 13.5 | 20 | Negative line | 8.6 |