Planar transformers
Our official sales partner: Dongke Semiconductor
Dongke is a leading manufacturer of high-frequency and high-efficiency power supply ICs, synchronous rectifiers and innovative solutions for power electronics.
Through this partnership, we can offer our customers access to a wide range of state-of-the-art technologies and products - from synchronous rectifiers for efficient energy conversion to customized solutions for industrial applications and consumer electronics.
Through this partnership, we can offer our customers access to a wide range of state-of-the-art technologies and products - from synchronous rectifiers for efficient energy conversion to customized solutions for industrial applications and consumer electronics.
Planar transformers for high-frequency applications
Planar transformers are innovative, energy-efficient transformer solutions for power transmission in modern electronic systems. In contrast to conventional transformers, they use flat, planar windings that are integrated into printed circuit boards. This enables a compact design with high power density and improved thermal management.
Due to their low height and efficient heat dissipation, planar transformers are particularly suitable for applications where space and energy efficiency are crucial. Typical applications include power electronics, renewable energy systems, electric vehicles and telecommunications equipment.
Rotima AG, in cooperation with Dongke Semiconductor, offers a wide range of planar transformers as well as miniature transformers for electronics that meet the latest industry standards and are optimized for a variety of applications. Our experienced engineering team with over 20 years of expertise ensures that our products meet the highest quality and performance requirements.
Discover the advantages of planar transformers for your projects and benefit from our many years of experience and our commitment to innovative solutions.
Due to their low height and efficient heat dissipation, planar transformers are particularly suitable for applications where space and energy efficiency are crucial. Typical applications include power electronics, renewable energy systems, electric vehicles and telecommunications equipment.
Rotima AG, in cooperation with Dongke Semiconductor, offers a wide range of planar transformers as well as miniature transformers for electronics that meet the latest industry standards and are optimized for a variety of applications. Our experienced engineering team with over 20 years of expertise ensures that our products meet the highest quality and performance requirements.
Discover the advantages of planar transformers for your projects and benefit from our many years of experience and our commitment to innovative solutions.
Planar transformers in the electronics industry
Buy planar transformer ICs
- Compact and space-saving
- Efficient heat dissipation
- Versatile in use
- Quality through strong partnership
Product features
| Product model: | |
| Core type: | EE |
| Core material: | HE7 |
| Rotation ratio (Np/Ns): | 28T/4 |
| Vcc winding: | 88 |
| Inductance: | 3535 |
| MAX operating frequency: | 250KHz |
| Topology: | High-frequency DCM, CCM, QR-mode flyback and multi-mode flyback (recommended application topologies) |
Electrical properties
| Item | Measuring page | Standard | Test conditions |
| Inductance | HV-SW | 340uH-360uH | 100KHz/0.25V |
| Stray inductance | HV-SW | 6uH MAX | 100KHz/0.25V, whereby the other windings are short-circuited |
| DC resistor | HV-SW | 1250mΩ MAX | / |
| VC-PG | 1350mΩ MAX | / | |
| A-B | 25mΩ MAX | / | |
| Winding ratio | turns ratio | 28T:4T:8T | / |
| Resistance to stresses | (HV+SW):(A+B) | No failure, flying arc | 3750Vac 1mA 3S |
| (VC+PG):(A+B) | No failure, flying arc | 3750Vac 1mA 3S | |
| (HV+SW):(VC+PG) | No failure, flying arc | 1000Vac 1mA 3S |
Materials and structure of planar transformers
Planar transformers consist of flat, planar windings that are precisely integrated into printed circuit boards. This design enables a compact and efficient structure. The windings are usually made of copper layers, which are separated from each other by thin layers of insulation. The magnetic core, usually made of ferrite material, surrounds the windings and concentrates the magnetic field, ensuring low-loss energy transmission.
Thanks to their special design, planar transformers offer excellent heat dissipation and reduce electrical losses. These properties make them the ideal solution for space-saving and high-performance applications in the electronics industry, for example in power electronics and other energy-intensive applications. Rotima AG and Dongke Semiconductor supply customized planar transformers that are optimally adapted to industrial requirements.
Thanks to their special design, planar transformers offer excellent heat dissipation and reduce electrical losses. These properties make them the ideal solution for space-saving and high-performance applications in the electronics industry, for example in power electronics and other energy-intensive applications. Rotima AG and Dongke Semiconductor supply customized planar transformers that are optimally adapted to industrial requirements.
Do you have any questions about our offer?
Planar transformers
Advantages of planar transformers in power electronics
Planar transformers are used in numerous high-tech areas where compact design and energy efficiency are crucial. In power electronics, they are used in switching power supplies and inverters, where they enable reliable energy transmission and efficient heat dissipation.
In the automotive industry, they are used in electric and hybrid vehicles, for example in on-board chargers, in order to control the energy flow optimally. They also ensure a stable power supply with high power density in telecommunications devices such as base stations and network equipment.
Thanks to their versatility and efficiency, planar transformers are a forward-looking solution for modern electronic systems. Rotima AG and Dongke Semiconductor offer innovative products for these demanding applications.
In the automotive industry, they are used in electric and hybrid vehicles, for example in on-board chargers, in order to control the energy flow optimally. They also ensure a stable power supply with high power density in telecommunications devices such as base stations and network equipment.
Thanks to their versatility and efficiency, planar transformers are a forward-looking solution for modern electronic systems. Rotima AG and Dongke Semiconductor offer innovative products for these demanding applications.
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Planar transformers
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Further information on plan transformers
Planar transformers are innovative, compact and energy-efficient transformers that are an ideal solution for modern electronic applications thanks to their flat design and high power density.
What are the advantages of planar transformers over conventional transformers?
Planar transformers offer a compact design, improved heat dissipation, lower electrical losses and higher power density, making them ideal for modern electronic applications.
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How does heat dissipation work with planar transformers?
Thanks to the flat windings and tight integration into the PCB, heat is efficiently dissipated to the environment, preventing thermal overloads.
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What materials are used for planar transformers?
Planar transformers consist of copper layers for the windings, thin insulation layers and a ferrite core that concentrates the magnetic field and minimizes losses.
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Where are planar transformers used in power electronics?
They are used in switching power supplies, inverters and other high-frequency power supplies where compact design and energy efficiency are crucial.
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Why are planar transformers particularly suitable for electric vehicles?
Their low height, high power density and effective heat dissipation make them ideal for on-board chargers and other current-carrying systems in electric and hybrid vehicles.
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Planar transformers in Germany and Switzerland?
Where can I buy efficient planar transformers? - Rotima GmbH offers high-quality planar transformers that are specially designed for efficiency and durability. You can purchase these directly from us - both in Germany and in Switzerland.
Does Rotima offer transformer components for Switzerland? - Yes, we also supply customers in Switzerland with planar transformers and corresponding components that meet the highest quality standards.
What distinguishes your planar transformers in Germany? - Our planar transformers in Germany are characterized by state-of-the-art technology, high energy efficiency and compact design - perfect for a wide range of applications.
Does Rotima offer transformer components for Switzerland? - Yes, we also supply customers in Switzerland with planar transformers and corresponding components that meet the highest quality standards.
What distinguishes your planar transformers in Germany? - Our planar transformers in Germany are characterized by state-of-the-art technology, high energy efficiency and compact design - perfect for a wide range of applications.
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Industry solutions for planar transformers?
What industrial transformer solutions does Rotima offer? - We offer transformer solutions that have been specially developed for industrial applications - reliable, robust and efficient.
Do you offer transformers for medical technology? - Yes, our planar transformers are ideal for medical technology and meet the highest requirements in terms of safety and precision.
Are there transformers for renewable energies? - Our planar transformers for renewable energies are ideally suited to applications such as solar and wind power systems and support a sustainable energy future.
Do you offer solutions for smart home systems? - Yes, our planar transformers are an excellent choice for use in smart home systems and ensure efficient energy transmission in modern households.
Do you offer transformers for medical technology? - Yes, our planar transformers are ideal for medical technology and meet the highest requirements in terms of safety and precision.
Are there transformers for renewable energies? - Our planar transformers for renewable energies are ideally suited to applications such as solar and wind power systems and support a sustainable energy future.
Do you offer solutions for smart home systems? - Yes, our planar transformers are an excellent choice for use in smart home systems and ensure efficient energy transmission in modern households.
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