Dongguan Chipsen Electronics Technology Co., Ltd.
| Frequency | 1KHz-1MHz |
| Delivery Time | 3-4 Weeks |
| Input Voltage | 5V-480V |
| Mounting Type | Horizontal/ Vertical/ PCB mount |
| Payment Terms | T/T |
| Operating temperature | -40~265 |
| Output Voltage | 12V 24V 48V 60V 120V 240V |
| Core material | PC40/PC44/PC95 ferrite core |
| Supply Ability | 10000000/Month |
| Power | 1W-30W |
| Product name | EF20 Transformer |
| Packaging Details | Carton 1: 25.5 X 21.5 X 21cm Carton 2: 43.5 x 24.5 x 21 cm |
| Warranty period | 5 Years |
| Winding material | UL Approved Pure Copper Transformer |
| Model Number | EF20 |
| Certification | UL/CUL/ISO9001/ISO14001/RoHS/Reach/IATF16949 |
| Brand Name | Chipsen |
| Place of Origin | China |
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Product Specification
| Frequency | 1KHz-1MHz | Delivery Time | 3-4 Weeks |
| Input Voltage | 5V-480V | Mounting Type | Horizontal/ Vertical/ PCB mount |
| Payment Terms | T/T | Operating temperature | -40~265 |
| Output Voltage | 12V 24V 48V 60V 120V 240V | Core material | PC40/PC44/PC95 ferrite core |
| Supply Ability | 10000000/Month | Power | 1W-30W |
| Product name | EF20 Transformer | Packaging Details | Carton 1: 25.5 X 21.5 X 21cm Carton 2: 43.5 x 24.5 x 21 cm |
| Warranty period | 5 Years | Winding material | UL Approved Pure Copper Transformer |
| Model Number | EF20 | Certification | UL/CUL/ISO9001/ISO14001/RoHS/Reach/IATF16949 |
| Brand Name | Chipsen | Place of Origin | China |
| High Light | EF20 flyback transformer ，12V flyback transformer ，25W flyback transformer frequency | ||
The EF20 High-Frequency Transformer (also known as EF20/20) is a high-performance magnetic component engineered for mid-range Switch Mode Power Supply (SMPS) systems. Designed to handle power outputs typically ranging from 15W to 30W, the EF20 serves as an ideal upgrade from smaller EE-series transformers. Its optimized core geometry provides a larger winding window and a flatter profile, making it the preferred choice for engineers seeking a balance between high power density and efficient thermal management in compact electronic assemblies.
| Parameter | Typical Value / Spec |
|---|---|
| Core Type | EF20 / EF20/20 (Ferrite Core) |
| Mounting Type | Vertical / Horizontal PCB Mount |
| Pin Count | 8-Pin / 10-Pin / 12-Pin (Customizable) |
| Dimensions | Approx. 20.0mm x 20.0mm x 15.5mm (Excl. pins) |
| Power Output | 10.0W - 30.0W (Typical) |
| Operating Frequency | 50KHz - 300KHz |
| Input Voltage | 85V - 265V AC / 100V - 400V DC |
| Hi-Pot (Isolation) | 3.0KV - 3.75KV AC / 1min |
| Insulation Resistance | >=100MΩ (at 500V DC) |
| Leakage Inductance | < 2% - 4% (Typical) |
| Core Material | PC40 / PC44 / PC95 Mn-Zn Ferrite |
| Winding Wire | 100% Pure Copper (2UEW/3UEW/TIW) |
| Insulation Class | Class B (130°C) / Class F (155°C) |
| Ae (Effective Area) | 32.2 mm² |
| Operating Temp | -40°C to +125°C (Incl. Temp Rise) |
| Storage Temp | -25°C to +85°C |
| Compliance | RoHS, REACH, UL Recognized (Optional) |
A: The EF20 (EF20/20) core is specifically designed with a wider and flatter surface profile, which offers a significantly higher Surface-Area-to-Volume ratio than smaller cores like the EE19. In a 25W continuous-load environment—such as an LED driver—this increased surface area enhances Natural Convection Cooling, allowing heat to escape more efficiently from the core and windings. By maintaining a lower operating temperature, the transformer avoids reaching the Curie point of the ferrite material, preventing Thermal Runaway and ensuring that the inductance remains stable over long-term operation. Furthermore, using high-tier materials like PC95 allows the EF20 to achieve its minimum power loss at 100°C, perfectly aligning with the typical thermal profile of enclosed power modules.
A: The EF20 core provides a relatively large winding window compared to its height, which is an ideal characteristic for reducing parasitic effects. To achieve a leakage inductance of < 2%, we recommend the following strategies:
Chipsen Electronics Technology Co., Ltd., established in 2000, is a specialized manufacturer of high frequency transformer, low frequency transformer, toroidal inductor, SMD power inductor, super high current inductor, choke coil and switch. Chipsen has got a good reputation in domestic and oversea markets which include North & South America, Europe and Southeast Asia.
Chipsen possesses a professional management team, as an ISO9001, ISO14001 & IATF16949 audited company, which always commits to producing environmental protection and qualified products. Our products are certified by UL Class B/Class F/Class H, CQC and RoHS, and obtained 21 patents.
These achievements mainly come from our strong R&D team, providing various solutions for temperature decreasing, noise cancellation and coupled radiation conductivity. Our products widely used in various fields of new energy, PV, UPS, Robotics, smart home, security systems, health care and communication.
Vision: To Be Global Transformer Brand Supplier
Mission: Create Values for Customers and Society, Grow with Customers and Staffs
Values: Customer First, Team Cooperation, Embrace Changes, Integrity, Creative & Happy
Company Details
Business Type:
Manufacturer
Year Established:
2007
Total Annual:
28820000-29820000
Employee Number:
400~450
Ecer Certification：
Verified Supplier
Chipsen Electronics - Supplier to Fortune Global 500 Companies Magnetic Components Engineered for Performance & Reliability Founded in 2007, Dongguan Chipsen Electronics Technology Co., Ltd. is a professional manufacturer specializing in magnetic components and micro switches. ... Chipsen Electronics - Supplier to Fortune Global 500 Companies Magnetic Components Engineered for Performance & Reliability Founded in 2007, Dongguan Chipsen Electronics Technology Co., Ltd. is a professional manufacturer specializing in magnetic components and micro switches. ...
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