EPC19 surface mount transformer multiple specifications Charger Transformer
EPC19
EPC13 surface mount transformer is made by using EPC's special flat ferrite core, flame-retardant and high-temperature-resistant plastic frame, and high-quality enameled copper wire for precise winding.
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EPC19 is a flat-type manganese-zinc ferrite high-frequency transformer. It is mainly characterized by its thin, surface-mount / through-hole design, with a flat and low-profile magnetic core.
Product parameters
| Rated power | 25W | Cooling method | Dry type |
| Frequency characteristics | High frequency | Number of power phases | Single phase |
| Cooling method | Natural cooling | Voltage ratio | 3:1 |
| Moisture-proof method | Open type | Brand | CXWON |
| Winding Form | Multi-winding | Shape of the core | EPC Type |
| Shape and structure | Vertical type | Efficiency (η) | 95% |
Main transformer models：
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Core advantages of EPC transformer
1. The main feature of the EPC series is its thin thickness. Compared with EE and ER magnetic cores of the same power level, the overall height of the machine is lower, making it highly suitable for thin-shell products. It solves the design problems of limited PCB space and strict machine thickness, facilitating the miniaturization and lightweight of the equipment.
2. The window area of the magnetic core is large, and the frame can be designed with isolation barriers, facilitating the layout of reinforced insulation and three-layer insulated wires, easily meeting the creepage distance requirements of safety standards; multiple secondary windings and tap windings can be arranged, and the multi-output circuit design is friendly.
3. With reasonable winding, the leakage inductance is small, reducing peak voltages, reducing losses in the absorption circuit, improving the overall efficiency of the power supply, and reducing the risk of humming.
4. It supports two frame schemes: direct insertion DIP and SMD surface mount; the pin arrangement can be customized, suitable for large-scale automated production, with high soldering yield.
5. The flat shape has a large heat dissipation surface area, making it easier for heat to dissipate outward. The temperature rise is controllable during long-term full-load operation, improving the reliability of the power supply as a whole.
EPC transformer real-shot details：
Typical application scenarios
Flowchart
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FAQ
Q: What are the core differences between EPC19 and EFD20?
A: EPC19 has a flat and thin structure, with a lower overall height; EFD20 is thicker and has a slightly smaller window. Under the same power output, EPC19 is more suitable for thin-shell products.
A: EPC19 has a flat and thin structure, with a lower overall height; EFD20 is thicker and has a slightly smaller window. Under the same power output, EPC19 is more suitable for thin-shell products.
Q: Can EPC19 be made as a surface mount SMD or a through-hole DIP?
A: Yes, there are corresponding two skeleton versions. SMD surface mounting is suitable for automated reflow soldering; DIP through-hole mounting is suitable for wave soldering. Customers can choose based on the PCB process.
Q: Which circuit topologies is EPC19 suitable for?
A: It is most commonly used in flyback switching power supplies, and can also be used in small-power forward, isolated drive circuits, but is less used in push-pull and full-bridge high-power topologies.
Q: What are the reasons for the excessive leakage inductance of EPC19?
A: Inappropriate winding arrangement, poor winding process, insufficient winding coupling, excessive stacking of insulating tape; optimizing layer winding and sandwich winding methods can reduce leakage inductance.
Q: What are the common factors causing excessive temperature rise of the transformer in EPC19?
A: Actual power exceeds the design limit, large leakage inductance leads to high loss, incorrect magnetic material selection, small wire diameter results in high copper loss, and poor heat dissipation conditions.
