The VIPERGAN100WBTR is the member of the VIPerGaN family of offline flyback converters. It integrates a 700V enhancement-mode Gallium Nitride High Electron Mobility Transistor (GaN HEMT), which offers high performance when used in power electronics applications such as fast-charging adapters, 5G base stations, and electric vehicles, together with a peak-current controller on a single chip.
Part number | Package | RDS(ON) @ 25°C | Max. POUT @ 85V to 265Vac | Max. POUT @ 185V to 265Vac |
VIPERGAN50WTR | QFN 5mm x 6mm | 0.47Ω | 50W | 75W |
VIPERGAN65WTR | 0.29Ω | 65W | 85W | |
VIPERGAN100WTR | 0.27Ω | 85W | 100W | |
VIPERGAN100WBTR | 0.27Ω | 85W | 100W |
The VIPERGAN100WBTR achieves efficiencies above 90% under typical operating conditions with GaN’s low on-state resistance and the quasi-resonant (QR) control scheme. The controller operates in valley-skipping mode with dynamic blanking and valley synchronization. This zero-voltage switching (ZVS) approach minimizes switching losses across varying line and load conditions.
This level of integration reduces component count and enables more compact layouts. The VIPERGAN100WBTR supports up to 100W output power, in European range or with a PFC in the front end, with up to 75W available across the full ac mains range. Its single-switch QR flyback topology incorporates zero-voltage switching and frequency jitter to minimize losses, delivering high conversion efficiency and low standby consumption. Internal peak-current regulation ensures stable control, while built-in frequency jitter helps to spread the electromagnetic interference (EMI) spectrum.
With power management and adaptive burst mode, no-load power consumption falls below 30mW. These features translate into superior power density and improved energy savings for industrial power supplies and telecom power modules.
The EVLVIPGAN100WP is the STMicroelectronics 100W reference design evaluation board built around the VIPERGAN100WBTR. It implements a complete QR-flyback converter for USB-PD or other isolated 100W supplies with opto-feedback control. The board integrates EMI filtering, surge/overvoltage input protections and optimized thermal layout. Designers can use it to quickly evaluate performance and accelerate design cycles for industrial and telecom power supplies.
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