NCP1377D1R2G

AC DC Converters, Offline Switchers Overview

The NCP1377D1R2G is an offline flyback controller featuring true current mode modulation and a demagnetization detector for boundary conduction. It integrates an internal 8.0µs timer to limit idle frequency to 150 kHz, ensuring compliance with CISPR-22 EMI standards. The device supports burst mode operation at low peak currents to eliminate audible noise. Protection features include transformer core reset detection via auxiliary winding for fast overvoltage protection (OVP) with permanent latch-off, and short circuit protection that triggers safe burst mode with automatic recovery.

AC DC Converters, Offline Switchers Feature Summary

• Combines true current mode modulation with demagnetization detection for quasi-resonant operation
• Integrates an internal timer to restrict idle switching frequency for EMI compliance
• Provides fast overvoltage protection with permanent latch-off capability
• Includes short circuit protection with automatic recovery from safe burst mode

AC DC Converters, Offline Switchers Applications

• Offline flyback power supplies
• AC-DC converters requiring quasi-resonant operation
• Power adapters with strict EMI requirements

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized onsemi channels or certified distributors. Confirm the specific D1 suffix matches design requirements as it denotes package and tape/reel specifications. Check for obsolescence status as the product lifecycle may be limited. Ensure compatibility with existing PCB footprints and thermal management designs before finalizing procurement.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for applications requiring boundary conduction mode efficiency without complex feedback loops. The fixed 8.0µs timer suits designs where 150 kHz idle frequency is acceptable. Compare against NCP1377B variants if higher idle frequencies or different sampling times are needed. Ensure the SOIC-7 package fits the mechanical constraints of the target enclosure.

AC DC Converters, Offline Switchers Part Context

This component belongs to the NCP1377 family of offline controllers designed for high-efficiency flyback topologies. It shares functional similarities with other quasi-resonant controllers but is distinguished by its specific timer duration and protection logic. The D1R2G suffix indicates the SOIC-7 package type and reel packaging configuration used for surface-mount assembly.

AC DC Converters, Offline Switchers Replacement Considerations

The NCP1377BD1R2G is a related variant within the same family. Verify if the B version's 3.0µs timer and 1.5µs sampling time align with system EMI and control loop requirements before substitution.