GaN driver integrates galvanic isolation for safety and reliability

GaN driver integrates galvanic isolation for safety and reliability

New Products |
By Jean-Pierre Joosting

A galvanically isolated gate driver for gallium-nitride (GaN) transistors, the STGAP2GS from STMicroelectronics, trims dimensions and bill-of-materials costs in applications that demand superior wide-bandgap efficiency with robust safety and electrical protection.

The single-channel GaN driver can be connected to a high-voltage rail up to 1200-V, or 1700-V with the STGAP2GSN narrow-body version, and provides gate-driving voltage up to 15 V. Capable of sinking and sourcing up to 3 A gate current to the connected GaN transistor, the driver ensures tightly controlled switching transitions up to high operating frequencies.

With minimal propagation delay across the isolation barrier, at just 45ns, the STGAP2GS GaN driver ensures fast dynamic response. In addition, dV/dt transient immunity of ±100 V/ns over the full temperature range guards against unwanted transistor gate change. The STGAP2GS is available with separate sink and source pins for easy tuning of the gate-driving operation and performance.

Saving the need for discrete components to provide optical isolation, the STGAP2GS GaN driver eases the adoption of efficient and robust GaN technology in various consumer and industrial applications. These include power supplies in computer servers, factory-automation equipment, motor drivers, solar and wind power systems, home appliances, domestic fans, and wireless chargers.

In addition to integrating galvanic isolation, the GaN driver also features built-in system protection including thermal shutdown and under-voltage lockout (UVLO) optimized for GaN technology, to ensure reliability and ruggedness.

Two demonstration boards, the EVSTGAP2GS and EVSTGAP2GSN, combine the standard STGAP2GS and narrow STGAP2GSN with ST’s SGT120R65AL 75-mΩ, 650-V enhancement-Mode GaN transistors to help users evaluate the drivers’ capabilities.
The STGAP2GS in SO-8 widebody package, and the STGAP2GSN SO-8 narrow version, are available now, priced from $1.42 for orders of 1000 pieces.

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