EVLVIPGAN50FL

NRND

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15 V / 50 W QR flyback converter based on VIPERGAN50

概要

The EVLVIPGAN50FL evaluation board implements a 15 V-50 W SSR isolated flyback converter developed for general purpose application, operating from 90 to 265 VAC.

The reference design is built around the VIPERGAN50, a new advanced offline high-voltage converter by STMicroelectronics, having the following features:

- 650 V PowerGaN with embedded senseFET (Si) and HV startup;

- QR operation with 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;

- Input voltage feedforward compensation for mains-independent OPP intervention;

- Adaptive burst mode for advanced power management in light load conditions;

- Frequency jittering for EMI suppression.

Enhanced system reliability is ensured by the built-in soft-start function and by the following set of protections:

- Input OVP (settable);

- Brown-in and brown-out (settable);

- Output OVP (settable);

- Output overload;

- OCP LEB;

- Embedded thermal shutdown.

The EVLVIPGAN50FL is composed of a main board and a daughterboard, whose schematics are shown in Figure 1 and Figure 2 respectively.

The main board contains, on the primary side, a diode bridge for double wave rectification, an input pi filter for EMI, a flyback transformer, the VIPERGAN50 and all the related components needed for polarization and features setting; on the secondary side, the output capacitors and the output rectifier, realized by a Power MOSFET driven by a synchronous rectifier for efficiency optimization.