MOSFETs target hybrid & plug-in hybrid EVs

1st April 2015
Siobhan O'Gorman


MOSFET and rectifier families, designed to enable cleaner and smarter vehicles, have been introduced by Fairchild. The devices are particularly suitable for increasing the power ratings of onboard chargers and DC/DC converters used in hybrid and plug-in hybrid EVs. 

The AEC-Q101 qualified 650V SuperFET II MOSFET family is comprised of nine devices in a wide range of package options and covering an industry-low 41 mΩ RDS(on), enabling customers to reduce both switching and conduction losses. 

The MOSFET family is well suited for hybrid and plug-in EVs as its low specific resistance and outstanding switching performance enable high levels of efficiency. The devices use the latest super-junction technology to enable both a small form factor and greater efficiency. At high dv/dt conditions, the built-in diode can improve bridge circuit reliability.

Additionally, the MOSFETs’ body-diode performance enables manufacturers to achieve superior switching performance with low EMI. This is important as hybrid and plug-in EVs are inherently harsh EMI environments and adding as little additional EMI as possible improves system reliability.

Complementing the 650V SuperFET II MOSFETs is Fairchild’s family of automotive high voltage rectifiers, which combine outstanding performance with automotive-level reliability. The rectifiers are qualified to meet the industry’s AEC-Q101 specification and available in a broad range of voltage and current ratings, which makes them suitable for the on-board chargers of plug-in hybrid and EV, as well as DC/DC converters, stationary chargers and other high-voltage powertrain applications.

This product family is currently divided into three technology platforms: Ultrafast, Hyperfast and Stealth, all of which were designed considering the trade-offs between switching loss and conduction loss.

The Ultrafast devices have the lowest VF (forward voltage), which makes them suitable for low switching frequency applications and applications without a strict EMI requirement. The Hyperfast rectifiers have lower turn off time for faster switching applications such as PFC stages and secondary rectification stage of onboard charger.

The Stealth devices are faster than the Hyperfast and offer soft recovery to reduce noise and ringing at the cost of a somewhat higher VF (compared to Ultrafast) and higher reverse recovery charge Qrr (compared to Hyperfast). The rectifiers are also suitable for high switch frequency applications with an EMI requirement, such as PFC.

Fairchild’s nine automotive high voltage rectifiers are available with breakdown voltages of 600V and 1000V, forward currents from 15 to 80A and multiple package options, including TO247, TO220 and die sales. With these additions, the company’s portfolio of automotive qualified rectifiers is made up of 22 products. Fairchild can also customise these devices to suit manufacturers’ specific needs, such as custom dies and breakdown voltages.

“A chief goal for plug-in hybrid and EV manufacturers is keeping on-board battery chargers and DC/DC converters as light and small as possible while increasing power levels,” said Fabio Necco, Director, Hybrid and Electric Vehicle Segment, Fairchild. “With the broad portfolio of SuperFET II MOSFETs and rectifiers, Fairchild is enabling manufacturers to maximise efficiency, power density and reliability of these units, which is key to reducing their size and weight and is of course in line with the environmental, economic and energy benefits inherent in EV development.”

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