Product parameters
Operating frequency: 20kHz ~ 500kHz, suitable for high-frequency switching power supplies. Operating temperature: -40℃ ~ +125℃ (some models can reach +180℃). Storage conditions: -25℃ ~ +85℃, humidity 30% ~ 95% RH. Insulation withstand voltage: Usually requires AC 2000V, insulation resistance ≥200MΩ (tested at DC 500V).
* Product features ETD49 achieves a balance of medium power, high - frequency efficiency, and structural flexibility with a 49mm outer span. It is the preferred model in fields such as SMPS and photovoltaic energy storage. In the design, it is necessary to combine topology, winding technology, magnetic core material, and heat dissipation solutions to maximize performance and reliability. * Typical application fields
Switched - mode power supply (SMPS): Industrial power supplies, communication power supplies, server power supplies (200–1000W). Photovoltaic and energy storage: DC - DC/DC - AC conversion in micro - inverters and power conversion systems (PCS). Industrial control: PLCs, servo drives, IGBT drive transformers. Medical equipment: Isolated power supplies that meet safety regulations and low leakage current requirements.
* Product standards UL, RoHS, 3C, CQC * Dimensions 
Type | Structure
Tурe | Dimension（mm） | Pin Row （mm） | Row Pitch
（mm） | OD Pin
（mm） | note | A | B | C | Pin | Pin Pitch | ETD49-001 | Vertical | 55.0 | 41.5 | 58.5 | 9+9 | 5.00 | 27.5 | Φ1.0 |
| ETD49-002 | Vertical | 56.0 | 38.5 | 58.5 | 10+10 | 5.00 | 30.5 | Φ1.0 |
| ETD49-003 | Vertical | 56.5 | 40.0 | 58.0 | 11+11 | 5.00 | 27.5 | Φ1.0 |
| ETD49-004 | Horizontal | 56.5 | 55.0 | 51.5 | 10+10 | 5.00 | 40.5 | Φ1.0 |
| ETD49-005 | Horizontal | 56.0 | 59.0 | 43.0 | 10+10 | 5.00 | 40.7 | Φ1.0 | Double - slot |
* The above are the commonly used bobbin styles of the company,Other styles are not included for the time being,Welcome to consult. Our company can customize high - frequency transformers of various specifications according to customer requirements.
ETD49 Transformer The ETD49 is a mainstream model in the ETD series of high-frequency transformers. Built with MnZn ferrite cores, it is designed for switching power supplies operating at 20–250 kHz and covers a power range of 20–1000 W. It combines high power density, low losses, and excellent thermal performance, making it widely used in SMPS, photovoltaic inverters, and other equipment. Below is an analysis covering its core structure, key parameters, performance characteristics, and design considerations.
I. Core Structure and Key ParametersThe ETD series is characterized by a circular center post and a wide winding window, which optimize winding processes, reduce losses, and enhance power density. Parameter | Typical Value | Description | Outer Span (A) | 49 mm | Core size identifier | Core Material | MnZn Ferrite (PC44/PC47, etc.) | High permeability, low high frequency losses | Center Post Diameter | ≈ 20–22 mm | Circular center post reduces mean turn length and copper loss | Effective Area (Ae) | ≈ 38–42 mm² | Determines magnetic flux capacity | Magnetic Path Length (Le) | ≈ 120–130 mm | Affects magnetic reluctance and inductance | Window Area (Wa) | ≈ 600–650 mm² | Supports large wire diameters and multi winding designs | Operating Frequency | 20 kHz – 250 kHz | Typical optimized range for SMPS | Rated Power | 20 W – 1000 W | Depends on topology and thermal design | Operating Temperature | 40 °C to +125 °C | Industrial grade temperature range | Insulation Class | Class B / F | Meets 130 °C / 155 °C thermal endurance requirements |
II. Key Performance AnalysisPower and Efficiency
High Power Density: Wide window and circular‑center‑post design enable a power range of 20–1000 W within a 49 mm outer span, suitable for medium‑power SMPS.
Efficiency Performance: Balanced core and copper losses at 20–250 kHz, with typical efficiency of 88%–95%. Efficiency is influenced by topology (LLC/forward), winding technique (multi‑strand), and core material (low‑loss PC47).
Loss Control: Circular center post shortens mean turn length, reducing copper loss; MnZn ferrite exhibits low eddy‑current and hysteresis losses, minimizing heat generation.
Electrical Performance
Inductance & Saturation: Aₗ value ≈ 2500–3500 nH/N² (depending on air gap and material), facilitating magnetizing inductance design. Saturation flux density Bs ≈ 400–450 mT (at 25 °C), decreasing slightly at high temperatures—design margin required.
Insulation & Voltage Withstand: Primary‑secondary withstand voltage ≥ 3 kV AC, compliant with UL/EN safety standards, suitable for AC‑DC isolation requirements.
Leakage Inductance & Stray Capacitance: Optimized window structure allows leakage inductance to be controlled within 1%–3% (relative to magnetizing inductance). Low stray capacitance supports high‑frequency stability and EMI control.
Thermal Performance
Heat Dissipation Design: Core and bobbin provide airflow channels, suitable for natural or forced convection. Continuous operation temperature rise is typically ≤ 40 K under normal conditions.
Temperature Stability: Ferrite Curie temperature ≥ 210 °C, with minimal parameter drift over ‑40 °C to +125 °C, making it suitable for wide‑temperature applications.
Reliability and Consistency
Structural Reliability: Snap‑fit core assembly provides vibration resistance; UL‑certified bobbins and insulation materials ensure long‑term stability.
Consistency: Standardized tooling and automated winding keep parameter tolerances within ±5% – ±10%, ensuring high batch‑to‑batch consistency.
III. Core FeaturesKey Advantages
Design Flexibility: Multi‑pin bobbin (e.g., 10+10) supports configurations such as multiple windings and center taps.
Cost‑Effective Performance: ETD design balances performance and cost, ideal for volume production in industrial power supplies.
High‑Frequency Compatibility: Optimized for 20–250 kHz, compatible with mainstream PWM controllers (e.g., UC384x series, LLC controllers).
ETD49 (Outer Span 49mm) Transformer Core Characteristics The ETD49 is a mainstream medium‑power high‑frequency transformer model in the ETD series. Based on a standardized structural design with a 49mm outer span, it excels in high‑frequency compatibility, medium‑power coverage, and balanced performance and manufacturability, making it suitable for various power‑electronics conversion scenarios such as switching power supplies. Below are its core characteristics, summarized across four dimensions—structure, performance, manufacturability, and application—highlighting its distinct advantages and practical features.
I. Structural Design: Standardization & High Utilization, Supporting Multi‑Winding Requirements
Core Identity A = 49mm, employing the classic ETD structure with a circular center post and wide winding window. The circular center post reduces the mean turn length, while the wide window (≈ 600–650 mm²) supports large‑diameter wires, multiple windings (e.g., 10+10‑pin bobbins), and center‑tap designs, accommodating both isolated/non‑isolated and multi‑output topologies.
Snap‑fit core assembly ensures a compact, vibration‑resistant structure. The core and bobbin incorporate airflow channels, balancing space utilization with thermal management. Standardized industrial‑grade tooling enables high batch‑to‑batch consistency.
Effective cross‑sectional area (Ae) ≈ 38–42 mm²; effective magnetic path length (Le) ≈ 120–130 mm. Optimized magnetic‑circuit design provides low reluctance and ample margin for inductance design.
II. Performance: High‑Frequency Efficiency, Low Loss, and Strong Stability
Excellent High‑Frequency Compatibility: Standard MnZn ferrite cores (PC44/PC47, etc.) with low high‑frequency eddy‑current/hysteresis losses. Operating frequency covers 20 kHz–250 kHz, matching mainstream PWM/LLC resonant controllers—an optimal choice for medium‑ to high‑frequency switching power supplies.
High Power Density: Within a 49 mm outer span, it covers a power range of 20–1000 W. Balanced core‑ and copper‑loss design delivers typical operating efficiencies of 88%–95%. Power output per unit volume outperforms smaller‑size models in the same series.
Stable Electrical Characteristics:
Aₗ value ≈ 2500–3500 nH/N², offering flexibility in magnetizing‑inductance design.
Leakage inductance can be controlled within 1%–3%; low stray capacitance benefits high‑frequency stability and EMI suppression.
Saturation flux density (Bs) ≈ 400–450 mT (at 25 °C), with minimal parameter drift over a wide temperature range (‑40 °C to +125 °C). Curie temperature ≥ 210 °C, ensuring high‑temperature reliability.
High Safety‑Standard Compatibility: Primary‑secondary withstand voltage ≥ 3 kV AC; creepage distances comply with UL/EN standards. Standard Class B/F insulation materials meet safety requirements for AC‑DC isolated power supplies, suitable for safety‑critical applications such as medical and industrial equipment.
III. Manufacturability & Cost: Easy Processing & High Cost‑Effectiveness, Suited for Volume Production
Winding‑Friendly Process: The wide window reduces winding difficulty, supports automated winding and multi‑strand parallel techniques, effectively mitigating skin effect in high‑current scenarios, and enhances production efficiency.
Cost‑Optimized Design: The ETD series is inherently designed as an “Economic Transformer Design.” The ETD49 achieves an optimal balance between performance and cost, avoiding over‑engineering. Core components (core, bobbin) are industry‑standard common parts, lowering procurement and replacement costs.
High Parameter Consistency: Standardized tooling production keeps tolerances for core air gaps and winding parameters within ±5%–±10%, minimizing performance variation in volume supply and meeting the demands of industrial‑scale production.
IV. Application Compatibility: Broad Scenarios, Strong Topology Adaptability
Comprehensive Topology Support: Suitable for forward/flyback topologies in low‑power ranges (20–200 W) and LLC resonant, push‑pull, etc., in medium‑ to high‑power ranges (200–1000 W). Air gaps can be flexibly adjusted (e.g., added in forward converters to prevent saturation; reduced in LLC to improve efficiency).
Diverse Application Scenarios: Covers industrial, telecommunications, photovoltaic/energy storage, and industrial‑control fields. A mainstream choice for 200–1000 W switching power supplies, micro‑inverters, energy‑storage converters, PLC/servo‑drive power supplies, and IGBT gate‑drive transformers.
Flexible Thermal Management: Supports both natural convection and forced‑air cooling. Continuous‑operation temperature rise is typically ≤ 40 K, requiring no complex heat‑sinking structures, making it suitable for compact‑equipment thermal designs.
ETD49 (Outer Span 49mm) Transformer Core Application Scenarios As a mainstream general‑purpose medium‑power high‑frequency transformer, the ETD49 leverages its core features—20–1000 W power coverage, 20–250 kHz high‑frequency compatibility, high power density, and strong safety‑standard compliance—to meet power‑electronics conversion needs across industrial, telecommunications, new energy, industrial control, and other fields. It is compatible with mainstream topologies such as forward, flyback, and LLC resonant, making it an optimal choice for both isolated and non‑isolated switching power supplies. Below are detailed applications by sector, highlighting scenario suitability and application value.
I. Switching Power Supply (SMPS) Sector – Core Primary ApplicationCovers various medium‑power standardized switching power supplies, meeting the power demands of industrial and commercial equipment—the most prevalent application for the ETD49.
Industrial Switching Power Supplies: 200–1000 W industrial‑grade AC‑DC power supplies and multi‑output power supplies, suitable for stable power delivery in automated production lines and industrial equipment, meeting requirements for wide‑temperature operation, vibration resistance, and high reliability.
Telecommunications Switching Power Supplies: Power supplies for communication base stations and distributed power units in equipment rooms, balancing high‑frequency efficiency with low loss to meet the uninterrupted power needs of telecom devices.
Server / Industrial PC Power Supplies: Medium‑ to low‑power server power supplies and industrial‑computer ATX power supplies, utilizing a compact structure to achieve high power density and accommodate equipment miniaturization.
Adapters / Chargers: High‑power industrial adapters and new‑energy‑equipment chargers (e.g., portable energy‑storage chargers), supporting high‑voltage/high‑current output and meeting fast‑charging and isolation requirements.
II. New Energy – Photovoltaic & Energy Storage Sector – High‑Growth ApplicationSuitable for the high‑frequency, high‑efficiency, and isolation demands of new‑energy power conversion, serving as a key component in micro‑inverters and energy‑storage converters.
Photovoltaic Micro‑Inverters: Used in the DC‑DC/DC‑AC conversion stages of residential/commercial PV micro‑inverters, enabling power conversion between PV modules and the grid while balancing noise immunity and energy efficiency.
Energy‑Storage Converters (PCS): Core conversion components in small energy‑storage cabinets and portable energy‑storage power supplies, adapting to the voltage conversion and isolation required for lithium‑battery charging/discharging and supporting wide input‑voltage ranges.
Integrated PV‑Storage Systems: Employed in devices combining PV charging, energy storage, and inversion, performing intermediate power conversion and electrical isolation while meeting the high‑frequency operating requirements of new‑energy equipment.
III. Industrial Control & Automation Sector – Precision‑Fitting ApplicationSuits the needs of industrial‑control equipment for small size, high stability, and low leakage inductance, ensuring precise control and reliable operation.
Servo Drives / Inverters: Drive power supplies and isolation transformers for medium‑power servo motors and small inverters, performing power conversion and signal isolation to reduce EMI interference on control signals.
PLC / Industrial‑Control Modules: Power transformers for industrial programmable controllers and expansion modules, adapted for multi‑channel low‑current outputs and meeting the standardized power requirements of industrial‑control systems.
IGBT/MOSFET Gate‑Drive Transformers: Used in the drive stages of industrial power devices to provide electrical isolation between control and power circuits, ensuring accurate transmission of drive signals and improving device stability.
CNC Equipment: Switching power supplies for small CNC machines, engravers, and other numerical‑control devices, combining high power density with vibration resistance to handle complex industrial‑site conditions.
IV. Medical & Security Sectors – Safety‑Critical ApplicationLeverages high insulation withstand voltage and low leakage current to meet the safety‑standard and reliability demands of medical and security equipment.
Medical Isolated Power Supplies: Isolated power for medium‑power medical devices (e.g., portable diagnostic equipment, patient monitors), complying with medical safety standards and minimizing leakage‑current risks to patients.
Security‑Monitoring Equipment: Power supplies for outdoor integrated security units and multi‑channel centralized monitoring systems, adapted to outdoor wide‑temperature conditions and providing isolated conversion from 220 V AC to low‑voltage DC to ensure uninterrupted operation of monitoring devices.
Medical‑Aesthetic Devices: Power‑conversion components in small medical‑aesthetic instruments (e.g., laser devices, RF systems), balancing compact size with high voltage withstand to meet the safety and portability requirements of medical‑aesthetic equipment.
V. Other Commercial / Civilian Sectors – Extended ApplicationsSuitable for various medium‑power commercial and civilian power‑electronics devices, meeting design needs for high‑frequency, high‑efficiency, and miniaturization.
Commercial Display Equipment: Power transformers for large‑size commercial displays and digital signage, supporting long‑duration operation while reducing temperature rise and power consumption.
Charging Piles: Used in portable EV charging piles and electric‑bicycle fast‑charging stations, performing voltage conversion and isolation, supporting high‑current output and high‑frequency operation.
Aerospace Portable Equipment: Power transformers for small aerospace portable test equipment, adapted to special conditions such as wide‑temperature operation and vibration resistance, ensuring reliable performance in extreme environments.
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