* Product Parameters Operating frequency:10kHz-500KHz Operating temperature:-40℃ to +125℃ Storage temperature:-25℃ to +85℃ Storage humidity:30 to 95%
* Features
The ER44 transformer is a medium-to-high power high-frequency transformer. Its core features are mainly reflected in its unique cylindrical center column structure, excellent heat dissipation performance, and wide power adaptability.
* Typical application areas
The ER44 transformer, with its large size and cylindrical core structure, which provides high power density and good heat dissipation, is mainly used in high-frequency switching power supplies, industrial drive equipment, and communication power supplies with output power in the hundreds of watts range. * Product Standards UL, RoHS, 3C,CQC * Size Specifications 
Type | Structure
Tурe | Dimension（mm） | Pin Row （mm） | Row Pitch（mm） | OD Pin
（mm） | note | A | B | C | Pin | E | F | ER49-001 | Horizontal | 49.5 | 57.0 | 36.0 | 9+9 | 5.00 | 45.00 | Φ1.0 |
| ER49-002 | Vertical | 51.5 | 37.0 | 52.5 | 9+9 | 5.0 | 27.5 | Φ1.0 |
| ER49-003 | Vertical | 54.5 | 37.0 | 54.0 | 11+11 | 5.0 | 27.5 | Φ1.0 |
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*The above are commonly used skeleton styles for the company.,Other styles are not included.,Inquiries are welcome. Our company can customize high-frequency transformers of various specifications according to customer requirements.
The ER49 transformer, with an outer leg spacing (A dimension) of 49mm, is a medium-to-high power, high-frequency transformer. Its performance is primarily reflected in its high power-handling capability and excellent high-frequency characteristics. Below are its core performance specifications:
Power Capacity and Frequency Characteristics The ER49 core features a relatively large effective cross-sectional area (Ae), enabling it to handle high power in high-frequency switching power supplies. Its power capacity is closely tied to the operating frequency:
Operating Frequency | Typical Power Capacity (VA) | Explanation | 50 kHz | Approx. 650 VA | Suitable for mid-frequency industrial power supplies, telecommunication power supplies, etc. | 100 kHz | Approx. 1000 VA | The core exhibits good loss control at high frequencies, resulting in high power density. |
Note: The actual power output is influenced by factors such as core material (e.g., PC40, PC95), winding process, and thermal management conditions. The values above are for reference design purposes.
Core Electrical Characteristics ER49 cores typically utilize high-permeability ferrite materials (e.g., PC44, PC95) and possess the following characteristics:
Low Core Loss: Features relatively low core loss at high frequencies (e.g., 100kHz), making it suitable for high-efficiency switching power supply designs.
High Saturation Flux Density: Allows for a larger variation in flux density (ΔB), which helps reduce the overall size of the transformer.
Good Temperature Stability: Core parameters exhibit minimal variation with temperature, ensuring stable transformer operation across a wide temperature range.
Structural Performance Advantages
Large Winding Space: The ER series core employs a cylindrical center post design. Compared to square-post cores of similar size, it offers a larger winding window, facilitating the use of thicker wire gauges. This helps reduce copper loss and enhances high-current output capability.
Excellent Thermal Performance: The core structure promotes heat dissipation. When combined with a rational winding layout, it effectively controls temperature rise, thereby improving the long-term reliability of the transformer.
The ER49 transformer is categorized as a medium-to-high power, high-frequency transformer. Its core performance characteristics are primarily reflected in its unique cylindrical center post structure, excellent thermal performance, and broad power adaptability.
Core Structural Characteristic: Cylindrical Center Post This is the most distinctive feature distinguishing the ER series cores from EE, EI, and other cores with square center posts, and it is also their fundamental advantage:
Larger Winding Space: The cross-sectional area of a cylindrical center post is typically larger than that of a square post of comparable size. This means that for the same core size, the ER49 can accommodate more copper wire (larger wire gauge or more turns), thereby supporting higher power output.
Winding Process Friendly: The smooth cylindrical surface has no sharp edges, reducing the risk of damage to the enamel insulation or stress concentration during both machine winding and manual winding. This is conducive to improving production efficiency and product consistency.
Low Leakage Inductance Design: The cylindrical coil structure helps minimize leakage inductance and distributed capacitance, giving the transformer better electrical performance during high-frequency operation.
Performance and Thermal Characteristics
High Power Density: Within the 49mm size category, the ER49 is a model with relatively high power density. At typical operating frequencies (e.g., 50kHz-100kHz), its output power range is generally between 650W and 1000W, with some optimized designs capable of achieving even higher power.
Excellent Thermal Performance: The core's geometric shape provides a moderate surface-area-to-volume ratio. Furthermore, the air gap design between the center post and side posts facilitates air circulation, resulting in better heat dissipation compared to some enclosed core structures, which effectively controls temperature rise.
Good High-Frequency Characteristics: The ER49 typically utilizes high-permeability ferrite materials like PC40 or PC44, which feature low core loss. It is suitable for high-frequency environments ranging from 20kHz to 500kHz, enabling effective reduction in transformer size and weight.
Application and Selection Characteristics
Application Scenarios: Widely used in medium-to-high power variable frequency drives, industrial switching power supplies, telecommunication power supplies, UPS systems, and resonant converters.
Selection Considerations: The ER49 is available with various bobbin specifications (e.g., vertical, horizontal). The appropriate model should be selected based on PCB layout and pin spacing requirements. Additionally, its core usually requires the use of an air gap to adjust inductance values.
The ER49 transformer is a widely used general-purpose model in the medium-to-high power, high-frequency transformer category. It is suitable for a broad range of applications within the 200W to 800W power level. Its main applications are as follows: 1. Switching Power Supplies
Industrial switching power supplies, DIN rail power supplies
Server power supplies, telecommunications power supplies
High-power adapters, LED driver power supplies
Forward, flyback, half-bridge, full-bridge, and LLC power supplies
2. Charging & New Energy
Electric vehicle on-board chargers
Electric two/three-wheeler battery chargers
Photovoltaic inverters, energy storage system high-frequency transformers
Portable high-power fast-charging power supplies
3. Industrial & Automation Equipment
High-frequency inverter welding machines
Induction heating power supplies
Power supplies for industrial control and automation equipment
Power supply modules for medical equipment and instrumentation
4. Home Appliances & Lighting
High-power inverter-based home appliances (air conditioners, refrigerators, washing machines)
High-power LED outdoor drivers, streetlight power supplies
Industrial lighting, emergency power supplies
5. Suitable Topologies
LLC resonant converter (most commonly used)
Full-bridge / Half-bridge switching power supplies
Forward, flyback, and push-pull circuits
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