NCP1124BP100G

AC DC Converters, Offline Switchers Overview

The NCP1124BP100G is a high-voltage offline switcher from onsemi, designed for flyback converter topologies. It integrates a 650V breakdown voltage power MOSFET with a current-mode PWM controller. The device operates at a switching frequency of 100kHz and supports a maximum duty cycle of 80%. It features internal startup circuitry activating at 17V and requires a Vcc supply between 8.5V and 35V. The component delivers up to 27W of output power and includes comprehensive protection mechanisms such as current limiting, over-temperature shutdown, overvoltage protection, and short-circuit protection. It is housed in a 7-pin PDIP package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage power switch with a current-mode PWM controller for simplified design
• Provides multiple protection features including current limiting, thermal shutdown, and overvoltage protection
• Operates with an internal startup circuit and fixed 100kHz switching frequency
• Supports isolated flyback topology applications

AC DC Converters, Offline Switchers Applications

• Offline AC/DC power supplies
• Flyback converter designs
• General purpose power adapters

AC DC Converters, Offline Switchers Procurement Notes

This component is officially marked as obsolete by the manufacturer. Availability is limited to third-party distributors or surplus markets. Verify authenticity and lot traceability carefully when sourcing from non-original channels. Ensure the specific suffix matches required specifications, as variations may exist within the family. Check for RoHS compliance status in current inventory listings.

AC DC Converters, Offline Switchers Selection Notes

Select this part for low-power offline applications requiring integrated switching and control. Consider the 650V rating for primary side voltage stress. Evaluate thermal performance given the 150°C junction temperature limit. Compare against newer generations in the NCP112x series for improved efficiency or pin compatibility if available. Confirm package dimensions match existing PCB footprints.

AC DC Converters, Offline Switchers Part Context

The NCP1124 belongs to the NCP112x family of high-voltage switchers from onsemi. This family includes variants like NCP1126 and NCP1129, which share similar integration levels but differ in switching frequency and voltage ratings. These devices are designed to reduce component count in offline power supplies by combining the power transistor and controller into a single package.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1124AP100G

AC DC Converters, Offline Switchers FAQ

What is the maximum switching frequency of the NCP1124BP100G?

The device operates at a fixed switching frequency of 100kHz.

Does the NCP1124BP100G include internal startup capability?

Yes, it features an internal startup circuit that activates at 17V.