NCP1681ABD2R2G

Overview

The NCP1681ABD2R2G is a power factor correction controller IC designed for bridgeless totem pole PFC topologies. It supports continuous conduction mode (CCM) and multi-mode operation, switching between CCM and critical conduction mode (CrM). The device operates at a typical switching frequency of 65 kHz with a maximum supply voltage of 30V. It utilizes a 20-SOIC package and includes features such as AC line monitoring, digital loop compensation, and novel current sensing schemes.

Feature Summary

• Drives bridgeless totem pole PFC topology by eliminating input diode bridges
• Configurable for fixed-frequency CCM or multi-mode CrM-CCM operation
• Integrates AC line monitoring and phase detection circuits
• Provides digital voltage loop compensation and novel current sensing

Applications

• High-density offline power supplies
• Server and high-performance computing power systems
• Telecommunications equipment power stages
• Industrial power conversion units
• OLED television power architectures

Procurement Notes

Verify the specific suffix ABD2R2G against official onsemi documentation to confirm pinout compatibility and operational mode configuration. Ensure the ordering information matches the required package type and tape-and-reel specifications. Cross-reference the component marking with the manufacturer's latest datasheet to validate authenticity and production status before integration into design files.

Selection Notes

Select this component for applications requiring high efficiency in the 350W to kilowatt range. It is suitable for designs targeting standards like 80Plus or CoC Tier 2. Choose this model over MCU-based solutions to reduce development time and code complexity. Ensure the design accommodates the 20-SOIC package dimensions and thermal requirements for the intended power density.

Part Context

This part belongs to the NCP1681 series of power factor controllers from onsemi. It extends the capabilities of the lower-power NCP1680 to higher power levels. The series is designed to simplify totem pole PFC implementation without requiring microcontroller coding. It complements onsemi's SiC MOSFETs and gate drivers for complete high-efficiency solutions.

Replacement Considerations

NCP1681AAD2R2G and NCP1681BAD2R2G are confirmed substitutes within the same family offering similar functionality.