NCP4318AHDDR2G

Power Supply Controllers, Monitors Overview

The NCP4318AHDDR2G is a synchronous rectification controller designed for LLC converters. It operates with a supply voltage up to 37 V, allowing direct connection to the LLC output. The device features two gate drive outputs (VG) and dual sensing inputs (VD/VS) to monitor SR MOSFET drain-source voltage. It supports adjustable dead time via variable VTH-OFF thresholds to maintain consistent timing across load variations. The component functions within an operating temperature range of -40°C to +125°C and is housed in an SOIC-8 package.

Power Supply Controllers, Monitors Feature Summary

• Dedicated control architecture optimized for LLC converter secondary-side synchronous rectification
• Integrated adaptive dead-time management utilizing variable turn-off thresholds for stable operation under varying loads
• Direct power supply capability from LLC output voltages up to 37 V, minimizing external component count

Power Supply Controllers, Monitors Applications

• High-efficiency isolated DC-DC power conversion using LLC resonant topology
• Secondary-side synchronous rectification in center-tapped transformer configurations
• Power supplies requiring reduced conduction losses through MOSFET replacement of rectifying diodes

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'AHDDR2G' against official onsemi documentation to confirm tape-and-reel packaging and temperature grade specifications. Ensure compatibility with target LLC controller packet modes. Confirm RoHS compliance status through current datasheets prior to integration.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing LLC topologies requiring precise secondary-side timing control. The variable threshold feature addresses dead-time stability issues common in light-load scenarios. Verify that the maximum supply voltage rating aligns with the specific LLC output voltage levels of the target design.

Power Supply Controllers, Monitors Part Context

This part belongs to the NCP43xx series of synchronous rectification controllers manufactured by onsemi. While other variants like the NCP4305 support Flyback and Forward topologies, the NCP4318 is specifically engineered for LLC applications. It complements primary-side controllers such as the NCP13992 to optimize overall system efficiency.

Power Supply Controllers, Monitors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.