Features
• Quasi-resonant (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 standby power consumption
with adaptive burst-mode
• Output OVP protection
• Input voltage feed-forward compensation for mains independent OPP variation
• Brown-in and brown-out protection
• Input OVP protection
• Embedded thermal shutdown
• Frequency jitter for EMI suppression

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

Description
The VIPERGAN50 is a high voltage converter, designed for medium power quasiresonant
ZVS (Zero Voltage Switching at switch turn-on) flyback converters, capable
to provide an output power up to 50 W in wide range.
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, 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.