These surface-mount devices are suitable for fly-back or active clamp forward converters that comply with the IEEE 802.3bt: the four-pair power-over-Ethernet known as 4PPoE or PoE++.
“Demand for more power in PoE devices has risen due to advancements in smart and IoT applications,” according to the company. “In response, Würth Elektronik expanded its series for 60W IEEE 802.3bt Type 3 and 90W Type 4 devices. These transformers utilise low-profile EFD20 and EFD25 packages, and offer high power densities over a wide range of common PoE output voltages.”
Applications are foreseen in video conferencing systems, automation control systems and smart IP cameras. Custom versions are possible on request.
At a glance
In all cases, input range is 33-57Vdc and Vaux is 12V
| Part | Topology | Vout | Iout | Vaux | L (uH) |
N pri:sec:aux |
Isat | Fswitch kHz |
L | W | H |
| 750318961 | Active clamp forward | 5 | 19 | 12 | 70 | 4:1:2.5 | – | 200 – 300 | 21.8 | 29.65 | 11.43 |
| 750318962 | Active clamp forward | 12 | 8 | 12 | 70 | 1.6:1:1:1 | – | 200 – 300 | 21.8 | 29.65 | 11.43 |
| 750319033 | Active clamp forward | 5 | 14.6 | 12 | 70 | 4:1:2.5 | – | 200 – 300 | 21.8 | 29.65 | 11.43 |
| 750319034 | Active clamp forward | 12 | 6 | 12 | 70 | 1.6:1:1:1 | – | 200 – 300 | 21.8 | 29.65 | 11.43 |
| 750319020 | CCM fly-back | 5 | 19 | 12 | 17 | 5:1:2.5 | 11.4 | 250 | 27.03 | 32.45 | 13.97 |
| 750319036 | CCM fly-back | 12 | 6 | 12 | 16 | 2.33:1:1 | 10.4 | 250 | 21.8 | 29.65 | 11.43 |
| 750319069 | CCM fly-back | 24 | 3 | 12 | 16 | 2:1.86:1 | 10.4 | 250 | 21.8 | 29.65 | 11.43 |
| 750319021 | CCM fly-back | 12 | 8 | 12 | 22 | 2.4:1:1 | 10.8 | 250 | 27.03 | 32.45 | 13.97 |
| 750319032 | CCM fly-back | 24 | 4 | 12 | 22 | 2.4:2:1 | 10.8 | 250 | 27.03 | 32.45 | 13.97 |
| 750319035 | CCM fly-back | 5 | 14.6 | 12 | 16 | 4.67:1:2.33 | 10.4 | 250 | 21.8 | 29.65 | 11.43 |