NCP1937B1DR2G

Overview

The NCP1937B1DR2G is a combination integrated circuit designed for offline power supplies, integrating Power Factor Correction (PFC) and Quasi-Resonant Flyback controllers. It implements Critical Conduction Mode (CrM) PFC with frequency clamping and a proprietary valley-lockout circuitry for stable quasi-resonant flyback operation. The device supports skip mode for light-load efficiency and includes foldback modes to eliminate audible noise.

Feature Summary

• Integrates CrM PFC and quasi-resonant flyback control in a single IC
• Proprietary valley-lockout ensures stable switching down to the fourth valley
• Frequency foldback mode eliminates audible noise beyond the fourth valley
• Skip mode operation maintains high efficiency under light load conditions

Applications

• Compact Switched Mode Power Supplies for adapters
• High-efficiency offline power conversion systems
• Power factor correction stages requiring minimal external components

Procurement Notes

Verify the specific suffix 'B1' against official onsemi documentation to confirm exact electrical characteristics and pinout compatibility. Confirm RoHS compliance status and lead-free certification details directly from the manufacturer datasheet before integration into designs.

Selection Notes

Select this component for applications requiring combined PFC and flyback functionality to reduce bill of materials and board space. Ensure design requirements align with the internal frequency clamp limits and valley-lockout thresholds specified in the technical data sheet.

Part Context

This part belongs to the NCP1937 family of combination controllers. It is distinct from standalone PFC or flyback controllers by providing both functionalities in one package, optimizing system density and performance for adapter applications.

Replacement Considerations

NCP1937A3DR2G is a documented variant within the same product family offering similar combination control features.