VIPERGAN65 Converter with E-mode GaN HEMT

STMicroelectronics' VIPERGAN65 is a high-voltage converter, embedding an advanced PWM controller and 650 V GaN power transistor designed for single switch flyback converters. It is packaged in the small QFN 5x6, the smallest in its category, and is able to manage a power up to 65 W. Small device dimensions combined with the high performance and high switching frequency of a GaN power device, make a highly integrated design with high power density possible, obtaining a final product, USB-PD charger, which is faster, lighter, smaller, and easy to carry around.

Following the mega-trend for global energy reduction, the VIPERGAN65’s low stand-by consumption offers a direct contribution to reducing energy usage in line to the ambitious project of achieving net-zero emissions over the coming decades.

The quasi-resonant (QR) operation with the dynamic blanking time feature and the valley synchronization function reduces the switching losses and maximizes the overall efficiency at any input line and load condition. The advanced power management with low quiescent helps achieve low stand-by consumptions. The feedforward compensation minimizes the input peak power variation over the entire input voltage range. The device supports secondary side regulation (SSR) flyback configuration with a standard optocoupler.

Features

• QR flyback controller
• 650 V E-mode power GaN transistor
• Embedded sense FET
• Dynamic blanking time and adjustable valley synchronization delay functions to maximize efficiency at any input line and load condition
• Valley-lock to ensure constant valley skipping
• Advanced power management for less than 30 mW stand-by power consumptions with adaptive Burst Mode
• Output OVP
• Input voltage feedforward compensation for mains independent OPP variation
• Brown-in and brown-out protection
• Input OVP
• Embedded thermal shutdown
• Frequency jitter for EMI suppression