NCP1239MD65R2G

AC DC Converters, Offline Switchers Overview

The NCP1239MD65R2G is a fixed-frequency current-mode controller designed for flyback converter applications. It features a high-voltage startup current source to ensure quick and lossless power-on sequences. The device operates at a switching frequency of 65 kHz with a maximum duty cycle of 84%. It provides an output drive current of 500 mA and supports surface-mount installation in a SOIC-7 package. The component functions within a temperature range from -40°C to +150°C, offering robust performance for offline power supply designs.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage startup current source for efficient power-on sequencing without external resistors.
• Employs fixed-frequency current-mode control architecture optimized for flyback topologies.
• Includes internal shutdown functionality for enhanced system protection and energy management.

AC DC Converters, Offline Switchers Applications

• Offline flyback AC-DC converters
• General-purpose power supplies
• Adapter and charger designs

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'MD65' confirms the 65 kHz operating frequency variant. Confirm the 'R2G' designation indicates tape-and-reel packaging compatible with automated assembly processes. Ensure the SOIC-7 package dimensions match the target PCB footprint requirements before finalizing procurement orders.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a fixed 65 kHz switching frequency is required for EMI management in flyback designs. The integrated high-voltage startup simplifies circuit design by eliminating external startup resistor networks. Verify that the 500 mA output drive capability meets the gate charge requirements of the intended power MOSFET.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1239 series of fixed-frequency current-mode controllers. The series offers variants with different switching frequencies, such as 65 kHz and 100 kHz options. These controllers are engineered for cost-effective and reliable offline power conversion solutions across various consumer and industrial equipment categories.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes include other NCP1239 variants with identical pinouts but different frequencies, such as NCP1239LD100R2G (100 kHz) or NCP1239HD65R2G (65 kHz). Verify thermal and electrical compatibility when cross-referencing with older obsolete parts like NCP1239AD100R2G.