Transformateurs / transformers - Small Power Switching Transformers - FAMILLE 67EFD20-69EFD20 67EFD25-69EFD25
| Power up to 10 W-20W |
These transformers are fitted with high-performance ferrite cores EFD type, and are designed for use in
flyback or forward converters AC-DC as well DC-DC. Typical applications are low power/low cost
power supplies in:
* household appliances
* domotic appliances
* office equipment: computers, fax, printers, etc.
* battery chargers
* power supply in TVC, VCR and audio equipment.
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TYPESTechnical DataAs there are many variables in the construction of such transformers and they are generally
manufactured according to the customer's specifications, in the following only the general features
and the design guide-lines are listed.
* Input Voltage: 170 - 265 Vac
* Output Voltage: 5 - 12 - 24 V
* Output power:
67EFD20 up to 10 W
67EFD25 up to 20 W
* Switching frequency: up to 100 kHz
* Overtemperature of the windings: < 55°C
* Max. windings temperature: 115°C
* Test voltage for basic insulation primary and bias
to secondary winding(s): 2 kV - 50 Hz, 2 sec
* Test voltage for reinforced insulation primary and
bias to secondary winding(s): 4 kV - 50 Hz, 2 sec
* Test voltage primary to bias winding:
500 V - 50 Hz, 2 sec
* Approx. weight:
67EFD20-69EFD20 13 g
67EFD25-69EFD25 18 g
The inductance is measured at 10 kHz, 1V
Bias winding if requested.
The transformers are designed and tested in accordance with EN 138100; EN 60938
The coil formers are of flame-retardant plastic material in accordance with UL 94V-0