* Product parameters Operating frequency:10kHz - 500KHz Operating temperature:-40℃ to +125℃ Storage temperature:-25℃ to +85℃ Storage humidity:30 to 95%
* Product features
The ER43 transformer belongs to the medium - high power high - frequency transformer. Its core features are mainly reflected in the unique cylindrical center post structure, excellent heat dissipation performance, and wide power adaptability.
* Typical application fields
The ER43 transformer belongs to the medium - high power high - frequency magnetic core. Thanks to its unique cylindrical center post and wide winding window, it is widely used in the industrial, communication, and new energy fields. * Product standards UL, RoHS, 3C, CQC * Dimension specifications 
Type | Structure
Tурe | Dimension（mm） | Pin Row （mm） | Row Pitch（mm） | OD Pin
（mm） | note | A | B | C | Pin | E | F | ER43-001 | Vertical | 43.5 | 30.0 | 49.0 | 7+7 | 5.00 | 25.00 | Φ1.0 |
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*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.
The ER42 transformer is a medium-to-high power, high-frequency transformer. Its core performance is primarily reflected in its power capacity, frequency characteristics, magnetic core structure, and electrical insulation. Below is a detailed analysis of its performance parameters and characteristics:
Core Performance Parameters The performance parameters of ER42 transformers may vary slightly depending on the specific model (e.g., ER4215, ER4220) and core material (e.g., PC40, PC44), but the general specifications are as follows: Performance Indicator | Typical Parameter | Explanation | Rated Power | 240 VA - 390 VA | Approximately 240VA at 50kHz, up to 380VA at 100kHz, depending on the topology. | Operating Frequency | 40 kHz - 500 kHz | Suitable for high-frequency switching power supplies, commonly used in 50kHz-100kHz applications. | Core Material | PC40 / PC44 / PC95 | Ferrite cores, featuring high saturation flux density (~0.3-0.5T) and low loss characteristics. | Core Structure | Cylindrical Center Post | Cylindrical center post, providing larger winding space and better heat dissipation, suitable for high-power applications. | Insulation Class | Class B / F / H | Commonly Class B (130掳C) or Class F (155掳C), offering good temperature resistance. | Withstand Voltage | 3 kV - 4 kV | AC voltage withstand between primary and secondary windings, ensuring safe isolation. |
Structural Features and Advantages
Winding Advantage: The cylindrical center post design of the ER4X core (please note: typically ER42, A=42mm), compared to square center posts (e.g., EE type), facilitates easier winding and provides a larger effective winding cross-sectional area. This is beneficial for increasing output power and improving heat dissipation efficiency.
Thermal Performance: The core features a relatively large size (typically A=42mm), with a reasonable surface-area-to-volume ratio, enabling good control of temperature rise during high-frequency, high-power operation.
Application Scope: Widely used in medium-to-high power variable frequency drives, switching power supplies, energy storage inductors, and resonant converters.
Selection Considerations
Bobbin Matching: It is necessary to select the appropriate bobbin model based on PCB layout and pin spacing requirements.
Frequency and Losses: Although the ER4X core (please note: typically ER42) supports high-frequency operation, design must balance core loss and copper loss to avoid reduced efficiency or overheating caused by excessively high frequencies.
The ER43 transformer is categorized as a medium-to-high power, high-frequency transformer. Its core 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 ER43 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 43mm size category, the ER43 is a model with relatively high power density. At typical operating frequencies (e.g., 50kHz-100kHz), its output power range is generally between 240W and 390W, 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 ER43 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 ER43 is available with various bobbin specifications. 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 ER43 transformer, classified as a medium-to-high power, high-frequency magnetic core, is widely used in industrial, telecommunications, and new energy applications due to its unique cylindrical center post and spacious winding window.
Core Application Areas The ER43 transformer is primarily applied in medium-to-high power switching power supplies, industrial equipment, and communication systems, specifically including:
Industrial & Telecommunication Power Supplies: Such as high-power UPS systems, telecommunication base station power supplies, industrial variable frequency drives, and PC power supplies. For instance, in ATX 3.0 standard 1200W PC power supplies, the ER43 is commonly used as the main transformer to support high-current output.
New Energy & Vehicle Systems: In PV energy storage inverters, on-board chargers, and servo drivers, the ER43 is employed to achieve high-frequency energy conversion. Its favorable thermal characteristics make it suitable for high-current operating environments.
Resonant & Forward Topologies: Particularly well-suited for LLC resonant converters and single-switch forward circuits. The cylindrical core facilitates the winding of resonant inductors with low leakage inductance, contributing to improved power supply efficiency.
Performance Support (Why It Suits These Scenarios) The ER43's advantages in these scenarios stem from its unique physical structure and electrical characteristics:
Strong Power Handling Capability: At typical operating frequencies (50kHz-100kHz), the ER43's output power can reach 280W to 350W. With high-frequency design or optimized cooling, the upper power limit can even exceed 500W, sufficient to meet the power demands of most industrial equipment.
Excellent High-Frequency Characteristics: It offers a wide operating frequency range (typically 40kHz-500kHz). When paired with high-permeability materials like PC40 or PC95, the core exhibits low loss, making it suitable for high-frequency switching power supply applications.
Thermal & Manufacturing Advantages: The cylindrical center post not only facilitates easier winding (reducing the risk of enamel wire damage) but also increases the winding's cross-sectional area, benefiting heat dissipation and enabling higher output power.
Typical Circuit Topologies In practical applications, the ER43 transformer typically appears in the following classic topologies:
LLC Resonant Half-Bridge Converter: Leveraging the ER43 core's ease of creating low-leakage resonant inductors, it is commonly used in telecommunication power supplies or high-power DC-DC modules.
Single-Switch Forward Circuit: In industrial power supply design, the ER43 is often used in forward topologies, working with a reset winding to achieve energy transfer.
Push-Pull or Full-Bridge Circuit: In high-power inverters or frequency converters, the ER43 can be utilized in push-pull structures to realize high-power-density designs.
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