VIPER27LN

Overview

The VIPER27LN is a high-performance off-line switcher from the VIPerPlus family, designed for AC/DC conversion with a fixed frequency operation. It utilizes a Flyback topology and is housed in a 7-pin DIP package suitable for through-hole mounting. The device supports an output voltage of 800 V and delivers up to 18 W of output power. It operates within a supply voltage range of 8.5 V to 23.5 V, featuring a switching frequency of 60 kHz and a maximum duty cycle of 80%. The component functions reliably across a temperature range of -40°C to +150°C with a minimum operating supply current of 2.5 mA.

Feature Summary

• Integrates a rugged high-voltage MOSFET capable of withstanding 800 V breakdown.
• Includes built-in intelligent control features such as cycle-by-cycle current limiting and thermal shutdown.
• Offers low standby power consumption optimized for energy-efficient auxiliary power supplies.

Applications

• Auxiliary power supplies for LCD and plasma televisions
• Power modules for desktop computers
• USB port power delivery systems
• Remote receiver power circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct packaging and pin configuration. Confirm RoHS compliance status and lead times directly with authorized distributors. Cross-reference the part number with the latest revision history to avoid obsolete variants. Ensure the supplier provides valid traceability documentation for quality assurance purposes prior to finalizing procurement orders.

Selection Notes

Select this component for applications requiring compact offline converter designs with minimal external component count. The integrated high-voltage switch simplifies transformer design compared to discrete solutions. Consider the 60 kHz switching frequency for balancing transformer size and electromagnetic interference. Evaluate thermal management requirements given the wide operating temperature range and potential power dissipation in enclosed spaces.

Part Context

This device belongs to the VIPerPlus family of power management ICs, which are renowned for combining high voltage processing technology with advanced digital control. The VIPER27LN specifically targets low-power offline applications where space constraints and efficiency are critical. It represents a evolution in monolithic AC-DC conversion, integrating protection features typically found in more complex multi-chip solutions into a single small-outline package.

Replacement Considerations

Direct substitutes within the same family include the VIPER27A and VIPER27E, which share similar functional architectures but may differ in specific electrical ratings or packaging options. Verify compatibility regarding pinout and thermal characteristics when considering alternative models from other manufacturers offering comparable flyback controllers.