The STMicroelectronics VIPerGaN family of offline flyback power converters feature an integrated gallium nitride (GaN) power switch to enhance energy efficiency and simplify thermal management.
The VIPerGaN single-switch quasi-resonant flyback converters are available with a choice of three output-power ratings: 50 W, 65 W, and 100 W. Each converter combines a PWM controller with a high-voltage enhancement-mode GaN power transistor, and allows for secondary-side regulation using a standard optocoupler.
Housed in a 5 mm x 6 mm QFN package and integrating multiple control and protection features, the VIPerGaN converters enable designers of switch-mode power supplies to achieve superior power density and to save bill-of-materials cost. Thanks to advanced power management and low quiescent current, the converters consume standby power of less than 30 mW when operating in adaptive burst mode.
The VIPerGaN converters operate in quasi-resonant mode with dynamic blanking time and valley synchronization to reduce switching losses and maximize efficiency at all input line and load conditions.
Part supported: VIPERGAN100
Board part number: EVLVIPGAN100PD
The EVLVIPGAN100PD from STMicroelectronics is a 100 W USB Power Delivery (PD) 3.0 reference design for a USB Type-C® power adapter.
It is an isolated power supply with a stand-alone USB PD controller. The evaluation board implements, at the primary side, a quasi-resonant flyback converter based on the ST VIPERGAN100, high-voltage flyback converter with optocoupler feedback for voltage regulation and a high-voltage gallium nitride (GaN) power switch.
The converter combines a high-performance, low-voltage PWM controller chip with a 650 V start-up cell in a single package. The reference design achieves low standby power consumption thanks to the VIPERGAN100 advanced power management and low quiescent current.
To reduce the input mains current distortion, a power factor correction circuit based on the L6564 controller IC is used. At the secondary side, to increase system efficiency, rectification is based on the SRK1001 adaptive synchronous rectification controller.
The reference design also includes an STUSB4761 controller, which offers the benefits of a full hardware USB PD stack, allowing for robust, deterministic, and safe negotiation in line with USB PD standards.
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