As GaN fast chargers, 48V automotive systems, and AI edge devices continue to demand higher power density and efficiency, power design engineers face a common challenge:How can more power be delivered within limited space while controlling temperature rise and electromagnetic interference (EMI)?The size of traditional wound transformers, especially their height, has become a major obstacle to further miniaturization. With their low-profile structure, high power density, and excellent high-frequency performance, Planar Transformer have become an ideal solution.
Why Are Planar Transformers Better for High-Density Power Supplies?
1. Optimized for High-Frequency Applications
Planar transformers have low parasitic parameters and work well with GaN and SiC power devices operating at frequencies from 200 kHz to 700 kHz.
Higher switching frequencies allow transformers to become smaller and lighter.
2. Solving Space Constraints
In applications such as AI servers, onboard chargers (OBCs), and 48V power modules, height is often a critical design limitation.
Planar transformers can achieve a profile of only 7.4–9.0 mm, approximately one-third the height of conventional transformers.
This makes ultra-thin power designs much easier to achieve.
3. Improved Thermal and EMI Performance
The tightly coupled planar winding structure significantly reduces leakage inductance.Lower leakage inductance helps reduce voltage spikes and switching losses.The magnetic core structure also helps suppress electromagnetic interference at the source.
Key Application Areas
| Application | Typical Power | Recommended Series | key benefits |
| GaN Fast Chargers (USB PD 3.1) | 120W | TP20DS | 9 mm profile, >97% efficiency, low heat generation, low EMI |
| 48V Automotive DC/DC Modules | 71–120W | TP20BS / TP20DS | Automotive-grade temperature range (-40°C to +125°C), excellent thermal performance |
| AI Edge Gateways and Servers | 90–120W | TP20CS / TP20DS | Low leakage inductance, low EMI, suitable for high-speed processor power supplies |
| Industrial Communications and Base Stations | 20W | TPER14 | Compact size, high reliability, ideal for module power supplies |
| LED Driver Power Supplies | 20–120W | TP14 / TP18 | High efficiency and long service life |
Core Advantages
Ultra-Low Profile
- Height as low as 7.4–9.0 mm
- Approximately one-third the height of traditional solutions
High Efficiency
- Efficiency up to 97%
- Reduced thermal management requirements
Extremely Low Leakage Inductance
- Typical leakage inductance: 0.15–0.5 µH
- Lower switching stress on power devices
EMI-Friendly Design
- Magnetic shielding structure
- Reduced radiated emissions
Wide Operating Temperature Range
- -40°C to +125°C
- Suitable for automotive and industrial environments
High Isolation Capability
- 1500 VAC isolation voltage
- Compliant with safety requirements
Design Support: Why Choose SHINHOM Planar Transformer?
- Comprehensive Product Portfolio
- Flexible Customization
Fast Technical Support
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