Vertical Type Through Hole Ferrite Core Transformer Step Down Power Transformer

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.

• 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.

• 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.

• 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.