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Vertical Type Through Hole Ferrite Core Transformer Step Down Power Transformer
Place of Origin:
China
Brand Name:
Chipsen
Certification:
UL/CUL/ISO9001/ISO14001/RoHS/Reach/IATF16949
Model Number:
EE25
Minimum Order Quantity:
1000
Price:
US$0.5-2.5
Packaging Details:
Carton 1: 25.5 X 21.5 X 21cm Carton 2: 43.5 x 24.5 x 21 cm
Delivery Time:
3-4 Weeks
Payment Terms:
T/T
Supply Ability:
10000000/Month
Inquiry Now
Get A Quote
Specifications
Highlight Features
Vertical Type ferrite core transformer
,480V ferrite core transformer
,Ferrite Core step down power transformer
Frequency Range:
1KHZ-1MHZ
Operating Voltage:
12V - 480V
Power Output:
1W-500W
Core Material:
PC40/PC44/PC95 Ferrite Core
Mounting Type:
PCB Mount
Dimensions:
25.0mm X 25.0mm X 10.0mm
Product Description
Vertical Type Through Hole Ferrite Core Transformer Step Down Power Transformer
Product Overview
ETD34 High-Frequency Transformer: The Versatile Standard for Power Conversion
The ETD34 Transformer is a widely adopted magnetic component based on the "Economic Transformer Design" (ETD) core geometry. Specifically engineered for Switch Mode Power Supplies (SMPS) with power outputs typically ranging from 50W to 150W, the ETD34 serves as a versatile "middle-ground" solution. It is optimized to provide a high ratio of power handling to volume while maintaining a physical profile that allows for excellent thermal management and simplified manufacturing.
| Parameter | Typical Value / Spec |
|---|---|
| Core Type | EE25 (Ferrite Core) |
| Mounting Type | Vertical / Horizontal PCB Mount |
| Bobbin | 10-Pin / 14-Pin (Standard) |
| Dimensions | Approx. 25.0mm x 25.0mm x 10.0mm (Excl. pins) |
| Power Output | 20W - 50W (Typical range) |
| Operating Frequency | 50KHz - 200KHz |
| Input Voltage | 85V - 265V AC (Wide Range) |
| Hi-Pot (Isolation) | 3.0KV - 4.0KV AC / 1min |
| Insulation Resistance | >=100MΩ (at 500V DC) |
| Leakage Inductance | < 1% - 3% (Optimized for LLC/Flyback) |
| Core Material | PC40 / PC44 / PC95 Mn-Zn Ferrite |
| Ae (Effective Area) | 97.0 mm² |
| Ve (Effective Volume) | 7640 mm³ |
| Insulation Class | Class B (130°C) / Class F (155°C) |
| Operating Temp | -40°C to +125°C (Incl. Temp Rise) |
| Storage Temp | -25°C to +85°C |
| Compliance | RoHS, REACH, CE, UL Recognized |
Product Features
- Round Center Limb: The EE25 features a cylindrical center post, which is a hallmark of the ETD design. This allows for easier winding and a shorter mean length per turn (MLT) compared to square-post EE cores.
- Optimized Winding Window: The core geometry offers a large winding area, facilitating high-current windings, multiple output taps, or the use of Litz wire for high-frequency applications.
- High-Grade Ferrite Materials: Typically constructed using high-permeability Mn-Zn ferrites (e.g., PC40, PC44, or DMR44), ensuring low core losses at frequencies between 50kHz and 200kHz.
- Standardized Bobbins: Available in various 8-pin or 10-pin vertical and horizontal configurations, ensuring compatibility with standard PCB layouts and automated assembly lines.
Technical Specifications
What are the specific electromagnetic benefits of the EE25 round center post compared to a standard EE35 core?
The primary advantage of the round center post in the EE25 is the reduction of DC Resistance (DCR) and Leakage Inductance. Because the winding follows a circular path, the Mean Length per Turn (MLT) is approximately 10-15% shorter than a square-post core of similar cross-sectional area. This leads to lower copper losses and higher efficiency. Furthermore, the round shape eliminates sharp corners where magnetic flux tends to concentrate and insulation stress is highest, resulting in a more uniform magnetic field and improved long-term reliability.
Product Applications
- LED Drivers: Ideal for medium-power LED lighting systems and outdoor luminaires requiring high efficiency and PFC (Power Factor Correction).
- Industrial Automation: Powers PLC modules, DIN-rail power supplies, and control units in industrial environments.
- Telecommunications: Provides auxiliary and main power for networking hardware, small cell stations, and PoE (Power over Ethernet) systems.
- Medical Equipment: Used in diagnostic devices and patient monitoring systems that require high isolation (up to 4kV AC) and compact form factors.
How does the power handling capability of the EE25 vary between a Flyback and an LLC Resonant topology at a switching frequency of 100kHz?
Topology choice significantly impacts the EE25's throughput. In a Flyback topology, where energy is stored in the core, the EE25 is typically rated for 80W to 120W due to core saturation limits and heating. However, in an LLC Resonant or Forward topology, where energy is transferred directly, the EE25 can comfortably handle 150W to 200W+. This is because resonant topologies operate with lower peak currents and benefit from ZVS (Zero Voltage Switching), which reduces the overall thermal stress on the transformer.
Product Advantages
- Exceptional Cost-Performance Ratio: As a global standard, the EE25 benefits from mature manufacturing processes and high availability, making it one of the most cost-effective magnetic solutions for 100W-class power supplies.
- Superior Thermal Dissipation: The core's open architecture allows for significant airflow across the windings, preventing heat buildup and allowing the transformer to operate at high current densities without thermal runaway.
- Design Flexibility: The large effective cross-sectional area (Ae≈97 mm²) provides engineers with a generous safety margin against core saturation, making it suitable for wide-input voltage designs (e.g., 85V-265V AC).
- Reliable Safety Isolation: Easily accommodates primary-to-secondary creepage and clearance requirements through the use of margin tapes or triple-insulated wire (TIW), ensuring compliance with IEC/EN 62368-1 standards.
Manufacturer Information
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
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