SMD EFD15 EFD20 Ferrite Core High Frequency Flyback Transformer Low Profile
EFD20 Series SMD High-Frequency Transformer: The Pinnacle of Compact Power Conversion
The EFD20 (Economic Flat Design) series represents a breakthrough in high-frequency transformer technology, specifically engineered to meet the demands of modern, slim-profile electronic assemblies. As a Surface Mount Device (SMD), the EFD20 is optimized for high-density power conversion modules where vertical space is at a premium but high power output is non-negotiable.
Technical Specifications
| Parameter Item |
Typical Specification |
Unit |
Remarks |
| Ferrite Core Type |
EFD20 / EFD20/10/7 |
- |
Economic Flat Design |
| Effective Area (Ae) |
31.0 |
mm² |
Standard EFD20 core |
| Effective Path Length (Le) |
47.0 |
mm |
Standard EFD20 core |
| Effective Volume (Ve) |
1460 |
mm³ |
Total magnetic volume |
| Power Output |
15 - 25 |
W |
Typical for Flyback/Forward |
| Operating Frequency |
50 - 500 |
kHz |
Optimized for HF switching |
| Dielectric Strength |
3000 |
VAC |
Primary to Secondary (1 min) |
| Operating Temperature |
-40 to +125 |
°C |
Including self-heating |
| Mounting Type |
SMD (Surface Mount) |
- |
8/10/12-pin options |
| Length (Max) |
21.0 |
mm |
Standard SMD footprint |
| Width (Max) |
20.5 |
mm |
Standard SMD footprint |
| Height (Max) |
8.0 |
mm |
Low profile / slim design |
| Safety Standards |
UL 94V-0, RoHS, REACH |
- |
Halogen-free option |
| Insulation Class |
Class B (130°C) / Class F (155°C) |
- |
Customizable |
Product Features
The EFD20 stands out due to its cross-sectional area consistency and optimized magnetic path. It features a low-profile construction that significantly reduces the overall footprint on the PCB. The SMD terminal design is ruggedized to withstand rigorous lead-free reflow soldering processes.
Furthermore, the EFD20 supports a wide operating frequency range—typically from 50kHz to 500kHz—and is constructed with high-grade ferrite materials that ensure low core loss even at elevated temperatures.
Technical FAQ: High-Frequency Performance
Q: Can the EFD20 transformer support high-speed switching frequencies (e.g., 200kHz+) used in GaN-based PD chargers?
A: Yes, the EFD20 is an ideal candidate for GaN (Gallium Nitride) and SiC (Silicon Carbide) high-frequency designs. We optimize the performance for 100kHz - 500kHz operation through:
- High-Frequency Ferrite Materials: We utilize premium core materials that maintain low core loss and high saturation flux density at elevated frequencies and temperatures.
- Skin Effect Mitigation: We employ Litz wire or multi-strand winding techniques, which drastically reduce AC resistance and prevent power loss caused by the skin effect.
- Low Leakage Inductance: By using advanced automated winding technology, we consistently keep leakage inductance below 1.5% of the primary inductance.
Product Applications
The versatility of the EFD20 makes it indispensable across various high-tech sectors:
- DC-DC Converters: Providing isolated power in telecommunications and server power supplies.
- LED Lighting Drivers: Its slim design fits perfectly into narrow linear lighting tracks.
- Automotive Electronics: Used in BMS (Battery Management Systems) and infotainment power modules due to its vibration-resistant SMD mounting.
- Consumer Electronics: Ideal for ultra-thin adapters and PD (Power Delivery) chargers.
Product Advantages
The primary advantage of the EFD20 is its exceptional power-to-volume ratio. By utilizing a wider core window, it allows for better heat dissipation and the use of thicker wire or foil, which reduces DC resistance (DCR) and increases efficiency.
Technical FAQ: Thermal Management
Q: How does the EFD20's "Flat Design" optimize thermal management in slim-profile power modules?
A: The EFD (Economic Flat Design) core is specifically engineered for applications where vertical space is limited (typically <8.5mm). Its thermal advantages stem from its geometry:
- High Surface-Area-to-Volume Ratio: The flat shape provides a significantly larger surface area relative to its volume compared to traditional EE cores.
- Optimized Heat Path: The core's flat top provides a wide, stable contact surface for thermal interface materials or heatsinks.
- Reduced Hotspots: The wider winding window allows for better separation of primary and secondary layers, reducing internal thermal accumulation.
Company Strengths
Chipsen Electronics Technology Co., Ltd., established in 2000, is a specialized manufacturer of high frequency transformers, low frequency transformers, toroidal inductors, SMD power inductors, super high current inductors, choke coils, and switches.
Chipsen has earned a strong reputation in domestic and overseas markets including North & South America, Europe, and Southeast Asia. As an ISO9001, ISO14001 & IATF16949 certified company, we are committed to producing environmentally friendly and qualified products.
Our products are certified by UL Class B/Class F/Class H, CQC and RoHS, and we hold 21 patents. These achievements stem from our strong R&D team, providing various solutions for temperature management, noise cancellation, and coupled radiation conductivity.
Vision: To Be Global Transformer Brand Supplier
Mission: Create Values for Customers and Society, Grow with Customers and Staff
Values: Customer First, Team Cooperation, Embrace Changes, Integrity, Creative & Happy
