900V GaN flyback switcher ICs eliminate need for heat sinks

900V GaN flyback switcher ICs eliminate need for heat sinks

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By Christoph Hammerschmidt

Power Integrations, vendor of high-voltage (ICs) for energy-efficient power conversion, has announced a 900V GaN extension to its InnoSwitch3 family of flyback switcher ICs.

The new ICs, which feature the company’s proprietary PowiGaN technology, deliver up to 100 watts with better than 93 % efficiency, eliminating the need for heat sinks and streamlining design of space-challenged applications.

The vendor also claims that InnoSwitch3 designs offer exceptional light-load efficiency making them ideal for providing auxiliary power in electric vehicles during low-power sleep modes. The AEC-Q100-qualified InnoSwitch3-AQ family is particularly suitable for EVs based on 400V bus systems where the 900V PowiGaN switch provides more power and increased design margin―required for 12V battery-replacement systems―with enhanced efficiency over silicon-based converters.

“The dominant bus voltage for electric vehicles is 400V,” stated Peter Vaughan, automotive business development director at Power Integrations. “EV manufacturers are optimizing their new generation of 400V systems and re-engineering various power stages in the vehicle, such as the on-board charger. The 900V PowiGaN switch is beneficial because it accommodates the highly inductive noise spikes that are often present in automotive environments.”

The new 900V InnoSwitch3-EP and InnoSwitch3-AQ off-line CV/CC flyback switcher ICs employ synchronous rectification, a valley switching discontinuous conduction mode (DCM) and continuous conduction mode (CCM) flyback controller. FluxLink communication technology enables the IC package to bridge the isolation barrier, optimizing efficiency and eliminating the need for optocouplers. PowiGaN technology enables InnoSwitch3-EP ICs to deliver up to 100W without heat sinks. The devices incorporate multiple protection features including line over- and under-voltage protection, output over-voltage and over-current limiting, and over-temperature shutdown. Devices are available with standard and peak power delivery options. Automotive InnoSwitch3-AQ devices can also deliver 100W from a 400V bus and provide performance and protection features similar to those of the 1700V silicon-carbide InnoSwitch3-AQ ICs currently used in 800V EV systems.


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