Automotive-qualified high-voltage switcher ICs
Power Integrations has added two new AEC-Q100 qualified, 1700-V rated switcher ICs to its InnoSwitch™3-AQ family. These latest devices are the industry’s first automotive-qualified switching power supply ICs to incorporate a silicon carbide (SiC) primary switching MOSFET. Delivering up to 70 W of output power, the new ICs are targeted for use in 600- and 800-V 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 percent, saving significant circuit-board space, enhancing system reliability and mitigating component sourcing challenges. Devices from the award-winning 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.
Peter Vaughan, director of automotive business development at Power Integrations said: “800-V batteries are becoming standard for EVs. 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. 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 30 V and 1000 V. Our SiC-based InnoSwitch3-AQ devices handle this vast range with incredible ease.”
Offered in a compact InSOP™-24D package, the new switcher 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 30 V 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 / CCM flyback controller achieves greater than 90% efficiency, easily meeting the strictest OEM requirements. These new switcher ICs consume less than 15 mW at no-load, which is ideal for reducing self-discharge in battery management systems.
The InnoSwitch3-AQ 1700-V 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 1700-V IC.