DLW32MH101XT2

Noise suppression technologies/case study introduction (Automotive)
INDEX
A DPI (Direct Power Injection) test was conducted using the same 1000Base-T1 EMC test board as conducted emission.
Frequency | 1 - 1000MHz |
---|---|
Power(MAX) | 39dBm |
Power Step | 0.5dB |
EUT | 1000Base-T1 EMC Test Board |
DC Power Supply | GP035-5(Takasago) |
Signal Generator | SML02(Rohde&Schwarz) |
Power Amplifier | BSA1040-100 (1-400MHz) BLWA4010-100 (400-1000MHz) |
Common mode noise is conducted out from an external source to the signal line on the 1000Base-T1 EMC test board, and a control PC is used to confirm whether any communication errors occurred.
In the same way as the conducted emission, the DLW32MH101XT2 (CMCC for 1000Base-T1), DLW43MH201XK2 (CMCC for 100Base-T1), and DLW32SH101XK2 (CMCC for CAN) were used as test CMCCs.
At low frequencies of 2 MHz and less, the CMCCs exhibited differences in performance levels, but for other frequencies, there was no difference in performance, and all CMCCs satisfied the limit values.
The differences in the CMCCs at 2 MHz and less are thought to be due to common mode attenuation (Scc21). Differences in the mode conversion characteristics did not affect the results in the DPI test.
After 1000Base-T1, the DPI test was also conducted for 100Base-T1. The CMCC for 100Base-T1 satisfied the limit values. However, the CMCC for CAN performed worse than the CMCC for 100Base-T1 at low frequencies of 1 MHz and less, and it also did not meet the limit values at 8 to 60 MHz, and failed the test.
The differences at 2 MHz and less are thought to be due to common mode attenuation (Scc21). Also, the differences at 8 to 60 MHz are thought to be due to the mode conversion characteristics.
One factor why the mode conversion characteristics of the CMCC affected the test results for 100Base-T1 is that the common mode noise that entered from an external source was converted to differential mode noise, which distorted the signal waveform, resulting in a communication error.
In the same way as conducted emissions, in addition to the CMCC, this may also be caused by mode conversion due to imbalances on the board, and so careful attention is needed in board design.
1. Effective for suppressing noise emitted from signal lines in automobile networks.
2. Fully compatible with the 1000Base-T1 automotive Ethernet standard
3. Operating temperature range for automotive applications: -40°C to 125°C
1. L4.5×W3.2×T2.7 mm, Compact type with dimensional tolerance of ±0.2 mm
2. Provides common mode inductance of 200 μH (at 0.1 MHz) despite its compact size
3. Significant improvement in mode conversion characteristics
Compatible interface | Part number | Size | Common mode inductance | Rated current |
---|---|---|---|---|
1000Base-T1 | DLW32MH101XT2 | 3.2×2.5mm | 100μH typ | 100mA |
100Base-T1 | DLW43MH201XK2 | 4.5×3.2mm | 200μH typ | 110mA |