Sunday, July 21, 2024

Automotive-Qualified High-Voltage Switcher ICs

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They are targeted for use in battery and fuel-cell electric passenger vehicles as well as in a wide range of industrial power applications

Two new AEC-Q100 qualified, 1700-volt rated ICs have been added to Power Integrations’ InnoSwitch3-AQ family. The new devices are the industry’s first automotive-qualified switching power supply ICs to incorporate silicon carbide (SiC) primary switching MOSFET. InnoSwitch ICs are known to reduce the number of components required to implement a power supply by as much as 50 per cent, saving significant circuit-board space, enhancing system reliability and mitigating component sourcing challenges.

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Delivering up to 70 watts of output power, the new ICs are targeted for use in 600- and 800-volt battery and fuel-cell electric passenger vehicles, as well as electric buses, trucks and a wide range of industrial power applications.

“800-volt 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 volts and 1000 volts. Our SiC-based InnoSwitch3-AQ devices handle this vast range with incredible ease,” said Peter Vaughan, director of automotive business development at Power Integrations.

Offered in a compact InSOP-24D package, the new ICs use a FluxLink feedback link, providing reinforced isolation of 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 volts 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 15 mW at no-load, which is ideal for reducing self-discharge in battery management systems.

The InnoSwitch3-AQ 1700-volt 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.

The reference design, DER-913Q, and hardware kit RDK-919Q allow designers to evaluate the InnoSwitch3-AQ 1700-volt IC.


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