NCP1200P100

AC DC Converters, Offline Switchers Overview

The NCP1200P100 is a PWM current-mode controller for low-power universal off-line supplies. It supports Flyback and Forward topologies with a fixed switching frequency of 100 kHz. The device features a maximum duty cycle of 80% and an output drive current of 250 mA. Operating voltage is limited to 16 V, with rise and fall times of 67 ns and 28 ns respectively. It operates within a junction temperature range of -25°C to 125°C (or up to 150°C per some specifications) and is housed in an 8-PDIP through-hole package.

AC DC Converters, Offline Switchers Feature Summary

• Supports operation without auxiliary windings, enabling simplified designs for AC-DC adapters and battery chargers.
• Integrates auto-recovery internal output short-circuit protection and internal temperature shutdown.
• Utilizes current-mode control with skip-cycle capability to maintain high efficiency at light loads.

AC DC Converters, Offline Switchers Applications

• Universal offline AC-DC power adapters
• Battery chargers
• Switching mode power supplies requiring low standby power

AC DC Converters, Offline Switchers Procurement Notes

Verify component status as the NCP1200P100 is listed as obsolete or discontinued by onsemi. Check RoHS compliance status carefully, as sources indicate non-compliance for this specific part number. Confirm availability through authorized distributors or secondary markets, noting potential supply restrictions.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring fixed-frequency current-mode control without auxiliary winding complexity. Ensure the design accommodates the 100 kHz switching frequency and 80% maximum duty cycle limits. Verify that the 8-PDIP package fits the thermal and spatial constraints of the target PCB layout.

AC DC Converters, Offline Switchers Part Context

The NCP1200 series represents a family of PWM controllers designed for cost-effective offline converters. The P100 variant specifically denotes the 100 kHz fixed frequency option within the PDIP-8 package. It serves as a foundational component for simple, reliable power supplies where low component count and integrated protection are prioritized.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers include NCP12400BBBBB2DR2G. Verify pinout and electrical parameter compatibility before substitution due to potential differences in package type and specific feature sets across the product line.

AC DC Converters, Offline Switchers FAQ

Does the NCP1200P100 require an auxiliary winding?

No, the controller is designed to operate without an auxiliary winding, allowing it to be powered directly from the DC power rail.

What protection features are integrated into the NCP1200P100?

It includes internal leading edge blanking, auto-recovery output short-circuit protection, and internal temperature shutdown.