High-Frequency E Ferrite Core Power Transformer SMPS Flyback Converter
EF20
EF20 Horizontal PCB Pin-Type High-Frequency Flyback Transformer, using manganese-zinc ferrite PC40/PC44 magnetic cores, is a mainstream magnetic component for medium and small power switching power supplies. It adopts a horizontal structure and occupies little PCB space.
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EF20 high-frequency transformer is widely used in AC-DC power supplies, LED drivers, chargers, smart home devices, electricity meters, DC-DC conversion modules. It can be customized according to customer requirements in terms of turns ratio, inductance, pin layout, insulation structure, and supports CE, FCC, RoHS, and REACH compliance documents for complete compatibility, meeting the requirements for European and American power system certification.
Product parameters
| Core material | PC40 / PC44 manganese-zinc ferrite | Installation method | PCB vertical pin insertion |
| Recommended power | 5 - 18 W | Operating frequency | 50 kHz - 200 kHz |
| Operating temperature | -25℃ ~ +125℃ | Bobbin | PBT/Bakelite UL94-V0 |
| pin | 5+2pin | Winding wire | Pure copper enameled wire / triple insulated wire |
| Inductance tolerance | ±5% / ±10% | Optional Processes | Full tape wrapping, varnish impregnation, vacuum impregnation |
| Brand | CXWON | Type | EF20 |
Main transformer models：
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Core advantages of EF transformer
1. EF20 magnetic core has optimized window area, allowing more windings to be accommodated in the same volume, with high power density and suitable for miniaturized power supply solutions.
2. PC40 ferrite magnetic core has low high-frequency loss and low temperature rise, ensuring stable operation under full-load conditions for a long time.
3. Horizontal pin structure, with a low height of the mounting board, saving PCB space in the entire machine.
4. Supports custom multi-winding, enabling multiple output channels (5V/12V/24V, etc.).
5. Uses UL94-V0 flame-retardant frame to meet safety and fire protection requirements.
EF transformer real-shot details：
Typical application scenarios
Flowchart
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FAQ
Q: What is the maximum power output of the EF20 transformer?
A: The conventional recommendation is 5 to 18W. Under the condition of 100kHz, if the windings and the air gap between the core are reasonably designed, the maximum power can reach 20W. If the environment is continuously hot, it is recommended to keep it within 15W.
A: The conventional recommendation is 5 to 18W. Under the condition of 100kHz, if the windings and the air gap between the core are reasonably designed, the maximum power can reach 20W. If the environment is continuously hot, it is recommended to keep it within 15W.
Q: What are the differences between the PC40 and PC44 magnetic core materials of EF20?
A: PC40 is a general model with high cost-effectiveness; PC44 has lower high-frequency loss and is suitable for high-frequency and high-temperature working conditions. It has better temperature rise performance and is slightly more expensive.
Q: Can EF20 provide a three-layer insulated wire version?
A: Yes. The three-layer insulated wire version can enhance the isolation between the primary and secondary windings, simplify the safety standard design, and be easier to meet the EN61558 safety standard.
Q: What is the general control range of the leakage inductance of EF20?
A: Under the conventional process, it is controlled within 1.5% to 3.5% of the primary inductance. If the customer's EMI requirements are strict, the winding structure can be optimized to 1% to 2%, and the lower the leakage inductance, the easier it is for EMI to pass.
Q: Can EF20 be coated with varnish? What are the benefits of coating?
A: Vacuum coating is supported. Coating can reduce noise, prevent moisture, improve shock resistance, and is suitable for industrial environments; however, the cost is slightly higher.
