NCP1345Q02D1R2G

AC DC Converters, Offline Switchers Overview

The NCP1345Q02D1R2G is a highly integrated quasi-resonant flyback controller designed for offline USB-PD and USB Type-C power converters. It features a dual-pin VCC architecture allowing direct connection to the auxiliary winding, which simplifies VCC management and reduces component count. The device includes primary-side output current limiting to maintain constant limits regardless of programmed voltage or power rating. Additional features include adaptive gate drive for synchronous rectifier spike reduction, frequency jittering for softer EMI, and auto-tuning skip modes that adjust based on output voltage to improve light-load efficiency.

AC DC Converters, Offline Switchers Feature Summary

• Dual-pin VCC architecture enables direct auxiliary winding connection for simplified design
• Primary-side output current limiting ensures constant limits independent of output voltage settings
• Adaptive gate drive circuitry reduces synchronous rectifier spike voltages
• Auto-tuning skip mode adjusts entry thresholds based on output voltage for optimized efficiency

AC DC Converters, Offline Switchers Applications

• USB PD phone, tablet, and notebook chargers
• Aftermarket USB PD multi-port chargers
• USB C enabled wall sockets

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix Q02 against official datasheets to confirm pinout and electrical characteristics match your design requirements. Ensure compatibility with USB-PD specifications if used in certified power adapters. Check RoHS compliance status as indicated in the ordering information. Confirm package type availability and reel quantities for manufacturing integration.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs requiring high integration and reduced external component counts in USB-PD applications. The dual-pin VCC feature is advantageous for minimizing bill-of-materials costs. Primary-side regulation simplifies feedback loop design. Consider thermal performance and magnetic component size constraints when evaluating the high-frequency quasi-resonant operation capabilities.

AC DC Converters, Offline Switchers Part Context

This component belongs to the NCP1345 family of quasi-resonant flyback controllers from onsemi. It is specifically optimized for USB Power Delivery and Type-C standards. The family shares core control algorithms but varies in suffixes indicating packaging, temperature grades, or specific feature configurations like frequency foldback settings.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes within the same family include NCP1345Q00D1R2G and NCP1345Q01D1R2G. Verify functional equivalence regarding VCC architecture and current limiting behavior before substitution. Cross-reference pinouts and thermal characteristics to ensure mechanical and electrical compatibility in existing layouts.