AEC-Q101-qualified MOSFETs apply to powertrain applications
Dual MOSFETs from Nexperia, simplify automotive solenoid control circuits and have been tested to one billion avalanche cycles. The Repetitive Avalanche Application Specific FET (ASFET) portfolio saves space, reduces component count and improves reliability, claims Nexperia.
They can be used to control automotive inductive loads such as solenoids and actuators. They provide up to four times faster turn-off time, says the company in addition to being simplified through a reduced bill of materials count.
MOSFET-based power schemes for solenoid and actuator control in automotive powertrains are typically built around boost, free-wheel diode or active clamp topologies. Alternatively, a repetitive avalanche design can be used. This dissipates energy from the inductive load by making use of the MOSFET’s ability to repeatedly handle current from the inductive load during switch off. A repetitive avalanche design offers comparable efficiencies to active clamp alternatives, to eliminate the need for diodes and other devices to minimise component count and circuit complexity. They also support faster switch-off times, a factor that can extend the reliability of electromechanical components such as solenoids and relays.
Typically this is done using planar technology, explains Nexperia. Until now this has only been possible using outdated planar technology. The Nexperia Automotive Repetitive Avalanche ASFETs have been specifically developed to address this issue, by guaranteeing repetitive avalanche functionality tested up to one billion cycles. In addition, when compared to boost topologies, they can simplify designs by providing up to 30 per cent component footprint efficiency due to a possible reduction of up to 15 board components.
The MOSFETs are automotive-qualified and available in 40 and 60V options with typical RDS(on) ratings from 12.5 to 55 mOhm. The MOSFETs are supplied in the company’s space-saving LFPAK56D (Dual Power-SO8) copper-clip package technology. The robust package features gull wing leads for increased board level reliability, and improved manufacturability including automated optical inspection (AOI).
