STMicroelectronics has released two new 100W VIPerGaN high-voltage converters, the VIPerGaN100W and VIPerGaN100WB. These monolithic gallium nitride (GaN) converters are designed for energy-efficient applications in domestic appliances, building automation, smart lighting, and consumer electronics such as televisions and device chargers.
The VIPerGaN100W features a 3.5A drain current limit, while the VIPerGaN100WB offers a 4.2A current limit, supporting peak power up to 125W. Both converters operate over a universal AC input voltage range (85V to 265V), delivering 100W at 185V. Each device integrates a 700V GaN power transistor with a low RDS(on) of 0.27mΩ to enhance thermal performance. The 5mm x 6mm QFN package includes the flyback converter and GaN gate driver, simplifying design.
The high switching-frequency capability of GaN transistors enables the use of smaller passive components, thereby optimizing energy efficiency and power density. ST has demonstrated this with the EVLVIPGAN100WP reference design for a 100W USB Type-C Power Delivery 3.0 adapter using the VIPERGAN100W. This reference design achieves over 92% peak efficiency and a power density of 24W/inÂł.
Both converters utilize a quasi-resonant flyback architecture with zero-voltage switching. Flexible power management techniques, including frequency foldback at light load and valley skipping at mid load, maintain efficiency across the load range. A proprietary valley lock feature in valley-skipping mode prevents variations in audio frequency. No-load power consumption is below 30mW due to burst-mode operation.
Integrated features include line-voltage feedforward for stable power delivery amid input-voltage fluctuations and dynamic blanking time to minimize switching losses. Protection mechanisms cover input and output overvoltage, overtemperature, brown-in, and brown-out.
The VIPerGaN100W and VIPerGaN100WB are available now.
