NCP1937B2DR2G

Overview

The NCP1937B2DR2G is a combination Power Factor Correction (PFC) and Quasi-Resonant Flyback controller designed for compact, high-efficiency switched-mode power supplies. It integrates a Critical Conduction Mode (CrM) PFC stage with near-unity power factor and a proprietary valley-lockout circuitry for stable quasi-resonant flyback operation. The device features frequency foldback to eliminate audible noise and skip mode for excellent light-load efficiency. Internal protection includes overvoltage latch-off and short-circuit safety modes.

Feature Summary

• Integrates CrM PFC and quasi-resonant flyback controllers in a single IC
• Proprietary valley-lockout ensures stable switching down to the fourth valley
• Frequency foldback mode eliminates audible noise at light loads
• Internal soft-start prevents traditional startup stress

Applications

• Compact AC-DC adapters
• High-efficiency switched-mode power supplies
• Consumer electronics power units

Procurement Notes

Verify the exact suffix against official onsemi documentation, as the provided reference data primarily details the NCP1937A3 variant. Confirm RoHS compliance status and package availability through authorized distributors. Ensure the specific B2 designation matches your design requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring integrated PFC and flyback control to minimize external component count. It is suitable for designs needing low standby power and noise-free operation across varying load conditions. Verify input voltage ranges and thermal performance against specific adapter specifications.

Part Context

Part of the NCP1937 family from onsemi, which combines PFC and flyback functionalities. This integration simplifies the design of efficient power adapters by reducing the number of required ICs and associated passive components, supporting compact form factors.

Replacement Considerations

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