2 February 2022
Power Integrations introduces first automotive-qualified high-voltage switcher ICs with 1700V SiC MOSFET
Power Integrations of San Jose, CA, USA, which provides high-voltage integrated circuits for energy-efficient power conversion, has added two new AEC-Q100-qualified, 1700V-rated ICs to its InnoSwitch3-AQ family. supply ICs to incorporate a silicon carbide (SiC) primary switching MOSFET. Delivering up to 70W of output power, the new ICs are targeted for use in 600V and 800V battery and fuel-cell electric passenger vehicles, as well as electric buses, trucks and a wide range of industrial power applications.
Highly integrated InnoSwitch ICs reduce the number of components required to implement a power supply by as much as 50%, saving significant circuit-board space, enhancing system reliability and mitigating component sourcing challenges. Devices from the InnoSwitch family are now available with a choice of cost-effective silicon, high-efficiency gallium nitride (GaN) and high-voltage SiC transistors, permitting designers to optimize their power solution across a broad range of consumer, computer, communications, industrial and automotive applications.
“800V batteries are becoming standard for EVs,” notes Peter Vaughan, director of automotive business development. “Multiple vehicle systems are connected to this powerful electrical source, yet delicate electronic control circuits require just a few volts for operation and communication. InnoSwitch devices allow the electronics to safely sip from the firehose of energy available on the main bus, using minimal board area and without wasting energy,” he adds. “Most exciting is the opportunity to dramatically simplify the emergency power supply for the main traction inverter, which may be called upon at a moment’s notice to operate from any voltage between 30V and 1000V. Our SiC-based InnoSwitch3-AQ devices handle this vast range with incredible ease.”
Offered in a compact InSOP-24D package, the new ICs use a FluxLink feedback link, providing reinforced isolation up to 5000 VRMS for secondary-side control. FluxLink technology enables direct sensing of the output voltage, providing benefits such as accurate regulation and extremely fast transient response. The circuit will start from 30V without external circuitry – critical for functional safety. Additional protection features include input under-voltage, output over-voltage and over-current limiting.
The inclusion of synchronous rectification and a quasi-resonant (QR)/CCM flyback controller achieves greater than 90% efficiency, easily meeting the strictest OEM requirements. These new parts consume less than 15mW at no-load, suitable for reducing self-discharge in battery management systems.
The InnoSwitch3-AQ 1700V parts are also suitable for industrial markets, where the integrated solution replaces discrete controller-plus-MOSFET designs, saving space, time and cost while increasing reliability in applications such as renewables, industrial motor drives, battery storage and metering.
A reference design DER-913Q and hardware kit RDK-919Q are available for designers wishing to evaluate the InnoSwitch3-AQ 1700V IC. Devices are priced at $5.64 for part number INN3947CQ-TL and $9.02 for part number INN3949CQ-TL in 1000-unit quantities.