NCP1937B51DR2G

Overview

The NCP1937B51DR2G is a combination power factor correction and quasi-resonant flyback controller manufactured by onsemi. It integrates CRM PFC and QR flyback functions in a single package to optimize adapter efficiency. The device operates within a temperature range of -40°C to +125°C and utilizes a 20-SOIC surface-mount package. Key electrical specifications include a switching frequency of 250 kHz, a maximum duty cycle of 52%, and an operating supply current of 15 mA. It supports PD-power dissipation up to 620 mW and features a minimum output voltage of 300 mV.

Feature Summary

• Integrates critical conduction mode (CRM) power factor correction with quasi-resonant flyback control for high-efficiency adapter designs.
• Provides combined functionality to reduce component count and simplify printed circuit board layout.
• Supports wide input voltage ranges suitable for universal AC-DC applications.

Applications

• Universal AC-DC adapters
• Chargers for consumer electronics
• Power supplies for home appliances

Procurement Notes

Verify the specific suffix DR2G against official onsemi documentation to confirm packaging details such as reel or cut tape configuration. Ensure compatibility with your assembly equipment regarding the SOIC-20 footprint. Cross-reference the full part number with authorized distributors to avoid counterfeit components. Confirm RoHS compliance status through the manufacturer's latest certification documents before finalizing procurement.

Selection Notes

Select this component when designing compact, high-efficiency power supplies requiring integrated PFC and flyback control. It is suitable for applications prioritizing reduced bill of materials and simplified thermal management. Consider the 250 kHz switching frequency and 20-SOIC package constraints during PCB layout. Evaluate thermal performance based on the specified 620 mW power dissipation capability under expected load conditions.

Part Context

This part belongs to the NCP1937 family of combination controllers designed for efficient power conversion. It serves as an alternative to discrete PFC and flyback controller solutions. The NCP1937 series is widely used in modern power adapter designs to meet energy efficiency standards. The B51 variant specifies particular internal parameters and pinout configurations distinct from other family members.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify functional equivalence with other NCP1937 variants only if datasheet parameters match exactly. Consult onsemi technical support for qualified alternatives if direct substitutes are required.