750V GaN switches target 55W power delivery designs

March 12, 2020 //By Nick Flaherty
The INN3x78C from Power Integrations uses a smaller “size 8” 750V GaN transistor for power supplies delivering between 27W and 55W without heatsinks.
The INN3x78C from Power Integrations uses a smaller “size 8” 750V GaN transistor for power supplies delivering between 27W and 55W without heatsinks.

Power Integrations has extended its InnoSwitch3 families of gallium nitride offline constant voltage/cnstance current CV/CC flyback switches with lower power versions.

The INN3x78C uses a smaller “size 8” 750 V PowiGaN transistor, enabling compact, efficient power supplies delivering between 27W and 55W without heatsinks. The ICs are housed in the same high-creepage, safety-compliant InSOP-24D package as larger members of the GaN-based InnoSwitch3 families, which target up to 120W.

The PowiGaN transistors have up to 94 percent efficient across line and load and are robust against line surges and swells commonly seen in regions with unstable mains voltage. This enables OEMs to specify a single power supply design to be used worldwide. Applications include USB PD and high-current chargers/adapters for mobile devices, as well as set-top boxes, displays, networking and gaming products and appliances, especially those aiming to comply with the planned European Energy Labeling Regulation.

“We have experienced increased demand for our efficient AC-DC converter ICs with the highly robust 750 V GaN transistor," said Chris Lee, director of product marketing at Power Integrations . "Simultaneous electrical strength and efficiency are difficult to achieve due to the relationship between Silicon MOSFET breakdown voltage and COSS-related switching loss. Our electrically strong PowiGaN transistors have very low COSS, so achieving over 94 percent efficiency and low field return rate from tropical markets is very straightforward.”

The InnoSwitch3 ICs are available now with InnoSwitch3-CP and InnoSwitch3-EP priced at $2.95 in 10,000 quantities, and InnoSwitch3-Pro priced at $3.25 in 10,000 quantities.

www.power.com/innoswitch3

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