The VIPER12AS-E is a low power off-line switched-mode power supply (SMPS) primary switcher integrated circuit from STMicroelectronics. It is designed to deliver a cost-effective solution for low-power applications, optimizing energy efficiency at light loads with a built-in high-voltage startup circuit and an 800V avalanche-rugged power section.

The VIPER12AS-E combines a dedicated current mode PWM controller with a high voltage power MOSFET on the same silicon chip. Typical applications for this device include auxiliary power supplies for home appliances, standby power supplies for TV or monitors, auxiliary converters for central systems, and battery chargers.

Key Features

• Integrated High-Voltage Startup: This feature enables the device to start up directly from the rectified mains voltage without the need for an external startup resistor, reducing power consumption.
• Pulse Frequency Modulation (PFM) Operation: At low load conditions, the VIPER12AS-E switches to PFM mode to maintain high efficiency over a wide range of loads.
• 800V Avalanche-Rugged Power Section: The robust design ensures reliable operation under harsh conditions and simplifies the design of the power supply's input stage.
• Current Mode Control: The current mode PWM controller provides excellent output voltage regulation and a simplified feedback loop design.
• Limiting Current with Adjustable Setpoint: This allows for precise control over the maximum output current, providing protection against overload conditions.
• Low Standby Power: The VIPER12AS-E is designed to consume very low power in standby mode, which is essential for energy-saving regulations.
• Overvoltage, Overcurrent, and Hiccup Mode Protection: These built-in protection features help to prevent damage to the IC and the power supply during abnormal conditions.

With its integrated features and protections, the VIPER12AS-E provides a compact and reliable solution for designing power supplies that meet the latest energy-saving standards and provide a high level of safety and reliability.