company blog about Recycle Infineon OptiMOS™ 7 25V Series Switching Optimized Power MOSFETs For Hard- And Soft-Switching Topologies

Recycle Infineon OptiMOS™ 7 25V Series Switching Optimized Power MOSFETs For Hard- And Soft-Switching Topologies

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As the core switching device in power electronic systems, the performance of power MOSFETs directly determines system efficiency, power consumption, and reliability. Infineon's OptiMOS™ 7 25V series switch-optimised power MOSFETs leverage the company's advanced trench technology and packaging processes. Specifically optimised for both hard-switching and soft-switching mainstream topologies, they deliver low conduction losses, fast switching characteristics and excellent thermal performance. Widely applicable across industrial, automotive and consumer electronics power conversion scenarios, they provide efficient, stable core device support for diverse topology designs.

I. Core Series Positioning: Optimised for Switching Topologies with Dual Adaptability for Hard and Soft Switching

The core design philosophy of the OptiMOS™ 7 25V series is to overcome the limitation of ‘single-topology adaptation’. Through precise tuning of device structure and electrical parameters, it simultaneously meets the application requirements of hard-switching topologies (such as Buck, Boost, Flyback) and soft-switching topologies (such as LLC resonant, ZVS/ZCS full-bridge). The 25V rated voltage selection caters to medium-to-low voltage power conversion scenarios (e.g., 12V/24V input power modules, battery management systems). Simultaneously, optimised switching characteristics resolve core challenges faced by MOSFETs across different topologies—excessive switching losses in hard switching and parasitic parameter interference in soft switching. This achieves ‘one device, multiple topology compatibility’, reducing system design complexity and component selection costs.

II. Hard Switching Topology Adaptation: Low Loss + Fast Switching Overcome High-Frequency Application Bottlenecks

Hard switching topologies (such as Buck, Boost, and Flyback) inherently involve switching devices turning on and off under overlapping voltage and current conditions. This leads to high switching losses, which significantly increase at high frequencies, adversely affecting system efficiency and device lifespan. The OptiMOS™ 7 25V series addresses this challenge through three core optimisations, delivering perfect adaptation for hard-switching applications.

1. Low On-State Losses, Reduced Steady-State Power Consumption

Employing Infineon's advanced trench technology, the series substantially reduces on-resistance (RDS(on)). Combined with optimised chip layout, on-state losses are decreased by 15%-20% compared to the previous generation at equivalent on-current levels. For instance, in a 12V input, 20A output buck topology, the low RDS(on) effectively minimises Joule heating during current flow. This is particularly beneficial in high-current, long-duration steady-state applications (such as industrial power supplies and automotive DC-DC modules), where it substantially reduces system power consumption and enhances power conversion efficiency.

2. Rapid switching characteristics for high-frequency hard switching

High-frequency operation in hard-switching topologies is crucial for enhancing power density, yet it often leads to a sharp increase in switching losses. The OptiMOS™ 7 25V series achieves faster turn-on and turn-off speeds by optimising gate charge (Qg) and output capacitance (Coss) parameters. Simultaneously, it controls reverse recovery charge (Qrr) to minimise voltage spikes and current oscillations during switching, thereby reducing switching losses. Switching speeds exceed previous generations by over 10%, enabling compatibility with high-frequency hard-switching topologies at 1MHz and above. This facilitates the design of compact, high-power-density power supply products.

3. Superior Thermal Performance Ensures High-Frequency Reliability

Under high-frequency hard-switching conditions, MOSFET losses convert into substantial heat. Inadequate thermal management may cause excessive junction temperatures, performance degradation, or even device failure. The OptiMOS™ 7 25V series employs advanced packaging technologies (such as TO-220, TO-252, DSON, etc.) to optimise thermal resistance and enhance heat dissipation efficiency. This ensures the device maintains safe junction temperatures under the demanding conditions of high-frequency hard switching, guaranteeing long-term stable system operation.

III. Soft Switching Topology Adaptation: Low Parasitic Parameters + High Stability Enhance Resonant Efficiency

Soft switching topologies (e.g., LLC resonant converters, ZVS/ZCS full-bridge configurations) utilise resonance mechanisms to enable switching devices to turn on and off at zero voltage (ZVS) or zero current (ZCS). This significantly reduces switching losses but imposes stringent requirements on MOSFET parasitic parameters (such as output capacitance Coss and gate parasitic inductance). Excessive parasitic parameters can disrupt resonance conditions, causing soft switching failure, increased losses, and electromagnetic interference (EMI). The OptiMOS™ 7 25V series features precisely optimised parasitic parameters tailored to soft switching requirements, making it the preferred choice for such applications.

1. Low output capacitance (Coss) for optimised resonance characteristics

Output capacitance Coss is a critical parameter affecting soft-switching resonance frequency and efficiency. Excessive Coss can cause excessively high resonance peak voltage, disrupting ZVS turn-on conditions and increasing losses. Through optimised chip architecture, the OptiMOS™ 7 25V series achieves industry-leading Coss values with minimal voltage dependency. This ensures stable capacitance characteristics across varying operating voltages, stabilising the resonant process in soft-switching topologies and maximising their low-loss advantages. It is particularly well-suited for applications such as LLC resonant power supplies and high-frequency inverters.

2. Low gate parasitic inductance reduces switching interference

Soft-switching topologies exhibit heightened sensitivity to electromagnetic interference (EMI). Excessive gate parasitic inductance readily induces gate voltage oscillations, generating EMI interference while disrupting switching timing and causing soft-switching failure. The OptiMOS™ 7 25V series optimises gate pin layout in its package design to reduce gate parasitic inductance. This minimises voltage spikes and EMI interference during switching, enhancing system electromagnetic compatibility (EMC) while ensuring stable soft-switching timing. It prevents device damage caused by timing deviations.

3. Wide safe operating area accommodates complex soft-switching conditions

During resonance in soft-switching topologies, MOSFETs may encounter transient overvoltage and overcurrent conditions, demanding higher safety margin requirements. The OptiMOS™ 7 25V series features a wide safe operating area (SOA), withstanding transient overvoltage and overcurrent surges while maintaining stable electrical performance under high-temperature conditions. This effectively prevents device damage from resonance anomalies, enhancing the reliability of soft-switching systems.

IV. Core Advantages and Typical Applications

1. Summary of Core Advantages

- Dual-Topology Adaptability: Optimised for both hard-switching and soft-switching topologies, a single device meets diverse design requirements, reducing selection and design costs;

- Low-loss characteristics: Minimised on-resistance (RDS(on)), gate charge (Qg), and output capacitance (Coss) for optimised losses in both hard-switching and soft-switching modes;

- High reliability: Exceptional thermal performance, wide safe operating area, and low EMI interference ensure long-term stable operation under high-frequency and demanding conditions;

- Diverse packaging options: Covers multiple packages including TO-220, TO-252, and DSON to accommodate varying power density and space requirements.

2. Typical Application Scenarios

With its exceptional adaptability to both hard-switching and soft-switching topologies, the OptiMOS™ 7 25V series finds extensive application across various medium-to-low voltage power conversion systems. Typical scenarios include:

- Industrial Applications: Industrial power supplies, DC-DC modules, inverters, servo drive systems (hard-switching Buck/Boost topologies, soft-switching LLC topologies);

- Automotive Electronics: On-board DC-DC converters, on-board chargers (OBC), battery management systems (BMS), meeting stringent automotive temperature and reliability requirements;

- Consumer electronics: Laptop power adapters, fast chargers, LED driver power supplies, balancing miniaturisation and high efficiency requirements;

- Renewable energy sector: PV microinverters, energy storage system DC-DC conversion modules, supporting high-frequency soft-switching topologies to enhance energy conversion efficiency.

V. Conclusion

Infineon's OptiMOS™ 7 25V series switch-optimised power MOSFETs leverage ‘dual-topology adaptation’ as their core advantage. Through comprehensive optimisation of conduction losses, switching characteristics, and parasitic parameters, they seamlessly accommodate both hard-switching and soft-switching topologies. This approach resolves the high-frequency loss challenges inherent in hard switching while meeting the stringent parasitic parameter and stability requirements of soft switching. Their outstanding performance, high reliability, and diverse packaging options provide efficient, convenient device solutions for power conversion systems across industrial, automotive, and consumer electronics sectors. This empowers engineers to streamline design processes, enhance system performance, and advance power electronics towards higher frequencies, miniaturisation, and greater efficiency.

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