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EMC Filters
The PI range of products perform extremely well for EMC measurements when the recommended pcb layouts are followed. Our experience in common mode and output filtering led to a range of standard, off the shelf, parts listed below.
The common mode E cores have sufficient leakage inductance to assist with differential mode noise. So from 7 – 60 watts this is the only inductive primary component required. Interestingly, when using the TinySwitch below 7 watts, EMC passes are easily possible with a one mH inductor in a PI circuit.
Secondary side filtering is again straight forward with values from 3 mH to 10 mH.
One area we have expertise in is power factor correction (PFC). The link below shows our standard range on a PDF. Usually PFC is required at power levels above 75 watts.
|
PI Part |
Current rating |
Inductance |
Kaschke Part |
Platform |
Common
Mode
Choke |
TNY Family |
0.54A |
2 x 12mH |
071.921, |
E13/4 |
| TNY Family |
0.28A |
2 x 22mH |
071.923, |
E13/4 |
| TNY Family |
0.26A |
2 x 27mH |
071.924, |
E13/4 |
| TNY Family |
0.24A |
2 x 33mH |
071.925, |
E13/4 |
| TOP Family |
0.6A |
2 x 15mH |
093.259, |
E16 |
| TOP Family |
0.5A |
2 x 27mH |
093.267, |
E16 |
| TOP Family |
0.8A |
2 x 22mH |
094.916, |
E20 |
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I dc Max |
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Filter
Inductor |
TNY/TOP |
3.4A |
4.7 uH Output Filter |
036.238, |
DR270 |
| TNY/TOP |
3.3A |
6.8 uH Output Filter |
036.230, |
DR270 |
| TNY/TOP |
3.2A |
10 uH Output Filter |
036.401, |
DR270 |
| TNY 264 |
0.29A |
1 mH Input Filter |
036.425, |
DR270 |
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