NCP1239JD65R2G

AC DC Converters, Offline Switchers Overview

The NCP1239JD65R2G is a fixed-frequency current-mode controller for offline flyback converters. It features a high-voltage start-up current source for quick power-on sequences. The device operates at a switching frequency of 65 kHz with a maximum duty cycle of 80%. It supports a supply voltage range of 8.8 V to 35 V and provides an output drive current of 500 mA. The component includes comprehensive fault protection mechanisms such as overcurrent, overload, overtemperature, and overvoltage protection. It is housed in a 7-pin SOIC package.

AC DC Converters, Offline Switchers Feature Summary

• Fixed-frequency current-mode control architecture
• High-voltage start-up current source for efficient power-on
• Integrated multi-protection fault handling system

AC DC Converters, Offline Switchers Applications

• Offline flyback converter designs
• AC-DC power management systems
• General-purpose power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix JD65 against official onsemi documentation to confirm pinout and electrical characteristics match your design requirements. Confirm RoHS compliance status through the manufacturer's datasheet or certification documents before finalizing procurement decisions.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a fixed-frequency current-mode controller with integrated high-voltage start-up capabilities. Ensure the design accommodates the 65 kHz switching frequency and the specified operating temperature range. Verify that the 500 mA output drive current meets the gate drive requirements of the external MOSFET.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1239 series of switching controllers designed for offline power conversion. It is manufactured by onsemi and falls under the category of Power Management ICs (PMIC). The device is intended for use in compact power supply designs where efficiency and reliability are critical.

AC DC Converters, Offline Switchers Replacement Considerations

Consult official onsemi substitution guides for verified alternatives. Do not assume compatibility with other NCP123x variants without verifying pinout and electrical parameter alignment.

AC DC Converters, Offline Switchers FAQ

What type of control mode does the NCP1239JD65R2G utilize?

It utilizes fixed-frequency current-mode control.

Does the NCP1239JD65R2G include internal protection features?

Yes, it includes overcurrent, overload, overtemperature, and overvoltage protection.