CREDIT: POWER INTEGRATIONS
Power Integrations, provider of high-voltage integrated circuits for energy-efficient power conversion, introduced a wide-creepage package option for its InnoSwitch3-AQ flyback switcher IC for automotive applications. A wide drain-to-source-pin creepage distance of 5.1mm eliminates the need for conformal coating, making the IC compliant to the IEC60664-1 standard in 800V vehicles while simplifying manufacturing and increasing system reliability.
Mike Stroka, product marketing engineer at Power Integrations, says, “Automotive designers rely on the efficiency and low component count of high-voltage power supplies designed around InnoSwitch3-AQ ICs. The increased primary-to-primary creepage and clearance distance between the drain and source pins in the new package provides support for the next generation of EV bus voltages. Power Integrations’ unique InSOP-28G package enables 1000 VDC to be provided to the primary side, while keeping all other pins safely isolated in pollution degree 2 environments.”
The 1700 V-rated CV/CC InnoSwitch3-AQ switching power supply ICs incorporate a silicon carbide (SiC) primary switch capable of delivering up to 80 watts of output power. The highly integrated ICs reduce the number of components required to implement a power supply by as much as 50%, saving space, enhancing system reliability, and mitigating component sourcing challenges. An increased drain-pin width is beneficial in withstanding high levels of shock and vibration, especially in eAxle automotive applications.
The new members of the InnoSwitch3-AQ family will start up with as little as 30V on the drain without external circuitry—which is critical for functional safety. Additional protection features include input under-voltage, output over-voltage, and over-current limiting. Synchronous rectification and a multi-mode valley switching, discontinuous/continuous conduction mode (DCM/CCM) flyback controller deliver greater than 90% efficiency. Devices consume less than 15mW at no-load. Target automotive applications include battery management systems, µDC-DC converters, control circuits, and emergency power supplies in the main traction inverter. The new ICs also have improved functionality for remote on/off.