VIPER26LN: The 26-Pin Powerhouse

The VIPER26LN is a 26-pin, high-voltage integrated circuit (IC) that combines a 700 V power MOSFET, a high-voltage startup circuit, and a current-mode controller. It is designed for use in a wide variety of AC-DC power supply applications, including:

• Offline power supplies
• Isolated power supplies
• High-power LED drivers
• Motor control
• Solar inverters
• UPS systems

The VIPER26LN is a highly efficient and reliable IC that has been used in millions of products worldwide. It is available in a variety of package options, including:

• SOIC-26
• DIP-26
• QSOP-26

Key Features of the VIPER26LN

The VIPER26LN offers a number of key features that make it an ideal choice for a wide range of power supply applications:

• High voltage: The VIPER26LN can withstand up to 700 V, making it suitable for use in high-voltage power supply applications.
• High efficiency: The VIPER26LN has a high efficiency of up to 95%, which helps to reduce energy consumption and heat dissipation.
• Low standby power: The VIPER26LN has a low standby power consumption of less than 100 mW, which helps to reduce standby losses.
• Built-in protection features: The VIPER26LN includes a number of built-in protection features, such as:
  • Overvoltage protection
  • Overcurrent protection
  • Short-circuit protection
  • Thermal shutdown
• Wide operating temperature range: The VIPER26LN can operate over a wide temperature range of -40°C to +125°C, making it suitable for use in a variety of environmental conditions.

Applications of the VIPER26LN

The VIPER26LN is a versatile IC that can be used in a wide range of power supply applications. Some of the most common applications include:

• Offline power supplies: The VIPER26LN can be used to design offline power supplies that convert AC power to DC power. Offline power supplies are typically used to power electronic devices such as computers, TVs, and mobile phones.
• Isolated power supplies: The VIPER26LN can be used to design isolated power supplies that provide electrical isolation between the input and output circuits. Isolated power supplies are typically used in applications where safety is a concern, such as medical and industrial applications.
• High-power LED drivers: The VIPER26LN can be used to design high-power LED drivers that provide power to high-power LEDs. High-power LED drivers are typically used in applications such as street lighting, stadium lighting, and commercial lighting.
• Motor control: The VIPER26LN can be used to design motor control circuits that control the speed and direction of motors. Motor control circuits are typically used in applications such as industrial automation, robotics, and appliances.
• Solar inverters: The VIPER26LN can be used to design solar inverters that convert DC power from solar panels to AC power that can be used by the grid. Solar inverters are typically used in residential and commercial applications.
• UPS systems: The VIPER26LN can be used to design UPS systems that provide backup power to critical loads in the event of a power outage. UPS systems are typically used in applications such as data centers, hospitals, and industrial facilities.

Design Considerations for the VIPER26LN

When designing a power supply using the VIPER26LN, it is important to consider the following factors:

• Input voltage: The input voltage range of the VIPER26LN is 85 V to 265 V AC.
• Output voltage: The output voltage of the VIPER26LN can be adjusted from 5 V to 24 V DC.
• Output current: The output current of the VIPER26LN is limited by the power MOSFET. The maximum output current is typically around 1 A.
• Switching frequency: The switching frequency of the VIPER26LN can be adjusted from 20 kHz to 100 kHz. The switching frequency should be chosen based on the desired efficiency and EMI performance.
• Layout: The layout of the power supply is critical to achieving good performance. The following guidelines should be followed:
  • Place the VIPER26LN close to the input and output capacitors.
  • Use a short, wide trace for the ground connection.
  • Keep the switching node away from sensitive components.

Conclusion

The VIPER26LN is a versatile and reliable IC that can be used in a wide range of power supply applications. It offers a number of key features that make it an ideal choice for high-voltage, high-efficiency, and low-standby power applications. When designing a power supply using the VIPER26LN, it is important to consider the input voltage, output voltage, output current, switching frequency, and layout.