NCP1239LD65R2G

AC DC Converters, Offline Switchers Overview

The NCP1239LD65R2G is a fixed frequency current mode controller from onsemi, designed for offline flyback power supplies. It operates at a switching frequency of 65 kHz and utilizes an SOIC-7 surface-mount package. The device supports a maximum duty cycle of 84% and provides an output drive current of 500 mA. Key electrical characteristics include a fall time of 30 ns and a rise time of 40 ns. It features a shutdown pin for control and is rated for a maximum operating temperature of +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Fixed frequency current mode control architecture
• Integrated shutdown capability for system management
• High thermal tolerance with operation up to +150°C

AC DC Converters, Offline Switchers Applications

• Offline flyback AC-DC converters
• Low power adapter designs
• Standby power supply circuits

AC DC Converters, Offline Switchers Procurement Notes

Verify the component status as Not Recommended for New Designs (NRND) before finalizing any engineering specifications or long-term production plans. Confirm that the SOIC-7 package dimensions align with existing PCB footprints. Ensure compliance with RoHS directives if required by the target market regulations. Check for alternative lead times due to potential end-of-life status.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a simple, fixed-frequency flyback topology with moderate power levels. The 65 kHz frequency offers a balance between transformer size and switching losses. Consider the 500 mA output drive when sizing external MOSFETs. Verify that the input voltage range matches the specific application requirements, as datasheet limits must be strictly observed for reliable operation.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1239 series of switching controllers, which are optimized for cost-effective offline power solutions. The 'L' suffix typically denotes specific performance variations within the family, such as the 65 kHz frequency variant in this case. It serves as a core control IC for converting mains voltage to regulated DC outputs in consumer and industrial electronics.

AC DC Converters, Offline Switchers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the NRND status, engineers should evaluate newer generations of flyback controllers from onsemi or other manufacturers that offer similar pinouts and electrical characteristics.