NCP1238BD65R2G

AC DC Converters, Offline Switchers Overview

The NCP1238BD65R2G is a fixed frequency current-mode controller designed for flyback converter topologies. It operates at a switching frequency of 65 kHz with a maximum duty cycle of 84%. The device supports an operating supply voltage range from -300 mV to 28 V and delivers an output current capability of 30 mA. Key timing parameters include a fall time of 22 ns and a rise time typically associated with its current-mode control architecture. It is housed in a 7-pin SOIC package and functions within a temperature range of -40°C to +125°C.

AC DC Converters, Offline Switchers Feature Summary

• Fixed frequency current-mode control architecture for stable regulation
• Integrated high-voltage startup circuit for simplified design
• Built-in line compensation for improved input voltage rejection
• Programmable soft-start to limit inrush current

AC DC Converters, Offline Switchers Applications

• Offline flyback power supplies
• AC-DC adapter designs
• Battery chargers
• General purpose isolated DC-DC converters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix BD65R2G against the manufacturer's latest datasheet to confirm pinout and electrical characteristics match your design requirements. Ensure the SOIC-7 package dimensions align with your PCB footprint. Confirm RoHS compliance status if required by your manufacturing standards. Cross-reference the part number with authorized distributors to avoid counterfeit components.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a fixed 65 kHz switching frequency and current-mode control. It is suitable for low-to-medium power flyback converters where line compensation and soft-start features are beneficial. Compare its 30 mA output drive capability against load requirements. Consider the 7-pin SOIC package for space-constrained designs. Evaluate thermal performance within the specified -40°C to +125°C operating range.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP123x series of offline switchers from onsemi. These controllers are optimized for cost-effective, high-performance power supplies. The NCP1238 variant specifically offers fixed frequency operation, distinguishing it from variable frequency models in the same family. It shares common architectural features like integrated startup and line compensation with other members of the series.

AC DC Converters, Offline Switchers Replacement Considerations

Check for NCP1238AD65R2G or NCP1238CD65R2G as potential variants within the same family. Verify pin compatibility and electrical parameter differences before substitution. Consult the manufacturer's cross-reference guide for approved replacements.