NCP1937B3DR2G

Overview

The NCP1937B3DR2G is a combination power factor correction and quasi-resonant flyback controller designed for adapter applications. It integrates CrM PFC and QR flyback stages to enable compact, high-efficiency switched-mode power supplies. The device features proprietary valley-lockout circuitry for stable valley switching, frequency foldback beyond the fourth valley to eliminate audible noise, and skip mode operation for excellent light-load efficiency with low standby power consumption.

Feature Summary

• Integrates Critical Conduction Mode (CrM) Power Factor Correction and Quasi-Resonant Flyback functionality in a single IC
• Proprietary valley-lockout circuitry ensures stable valley switching across multiple valleys
• Frequency foldback mode activates beyond the fourth valley to eliminate audible noise
• Skip mode operation provides high efficiency in light-load conditions while minimizing standby power

Applications

• Compact Switched Mode Power Supplies for adapters
• High-efficiency AC/DC conversion systems
• Power supplies requiring low standby power consumption

Procurement Notes

Verify the specific suffix 'B3' against official onsemi documentation to confirm exact electrical characteristics and pinout compatibility. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability may vary. Ensure the component meets all relevant safety standards required for the target adapter application before finalizing procurement.

Selection Notes

Select this component when designing adapters that require both power factor correction and isolated flyback regulation in a minimal footprint. It is suitable for applications prioritizing high efficiency at full load and ultra-low standby power. Consider the integrated nature of the PFC and flyback controllers to reduce external component count and simplify PCB layout compared to discrete solutions.

Part Context

The NCP1937 series belongs to onsemi's offline controller portfolio, specifically targeting combined PFC and flyback applications. This integration allows for significant reduction in system complexity and size compared to using separate controllers. The device is part of the broader NCP193x family, offering variations in timing parameters and control features to suit different performance requirements.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source data. Consult onsemi technical support or authorized distributor catalogs for direct replacements or pin-compatible alternatives if this specific variant is unavailable.