STMicroelectronics VIPERGAN50W

The VIPERGAN50W is a high voltage converter, designed for medium power quasi-resonant ZVS (Zero Voltage Switching at switch turn-on) flyback converters, capable to provide an output power up to 75 W in wide range and up to 100 W in European range or with a PFC in the front end.

It integrates a complete set of features that provide an extremely flexible and easy to use chip and helps to design a highly efficient offline power supply. The ZVS quasi-resonant operation with the dynamic blanking time feature and the valley synchronization function, that turns on the power switch always at the valley of the drain resonance, reduces the switching losses and maximizes the overall efficiency at any input line and load condition. The advanced power management with the low quiescent helps to achieve low stand-by consumptions. The feed-forward compensation minimizes the maximum output peak power variation over the entire input voltage range.

In addition to the above functions, the device offers protection features that considerably increase end-product’s safety and reliability: the output overvoltage protection (OVP), the overtemperature protection (OTP), the overload protection (OLP), the brown-in/out protection, that set the input voltage level to power on and power off the converter and the input overvoltage protection (iOVP), that protects the system in case of an abnormal increase of the input line. All the protections are auto-restart mode.

Features

Applications

• High efficiency power adapters
• Fast battery chargers
• Auxiliary power supply for appliances, industrial, consumers, lighting

EVLVIPGAN50WF - 15 V / 50 W QR flyback converter based on VIPERGAN50W

The EVLVIPGAN50WF evaluation board implements a 15 V / 50 W SSR isolated flyback converter developed for general-purpose applications, operating from 90 to 265 VAC.

The reference design is built around the VIPERGAN50W, a new advanced offline high-voltage converter by STMicroelectronics with the following features:

• 700 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 conditions;
• 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 EVLVIPGAN50WF is composed of a main board and a daughter board, the main board contains a diode bridge for double wave rectification, an input pi filter for EMI, a flyback transformer, the VIPERGAN50W and all the related components needed for polarization and feature setting on the primary side. On the secondary side, it contains the output capacitors and the output rectifier, realized by a Power MOSFET driven by a synchronous rectifier for efficiency optimization.

BUY NOW AT FARNELL

BUY NOW AT FARNELL