NCP1341B4D1R2G

AC DC Converters, Offline Switchers Overview

The NCP1341B4D1R2G is a high-voltage quasi-resonant controller for AC/DC flyback converters. It operates within a supply voltage range of 9V to 28V and supports switching frequencies up to 500kHz. The device features an integrated startup circuit with a maximum operating current of 1 mA. It functions reliably across a temperature range from -40°C to +125°C TJ. The component utilizes a 9-pin SOIC package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates active X2 capacitor discharge capability to achieve ultra-low no-load power consumption below 30 mW.
• Employs valley lock-out switching technology to ensure stable operation at low valleys, transitioning to frequency foldback for reduced switching losses.
• Includes dedicated protection mechanisms such as non-dissipative over-power protection (OPP), latch-overvoltage, and NTC-compatible thermal protection.

AC DC Converters, Offline Switchers Applications

• Medium or high power AC-DC adapters
• Ultra-high density AC-DC adapters
• USB PD standard compliant chargers

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix B4D1R2G against the manufacturer datasheet to confirm pinout and electrical tolerances. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Ensure the SOIC-9NB footprint matches the PCB design requirements. Validate that the 9V to 28V Vcc range aligns with the target application's bias winding configuration.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for designs requiring high efficiency in offline power supplies. The integrated valley locking and frequency jittering make it suitable for noise-sensitive applications. Consider the 1 mA supply current for low standby power requirements. The built-in X2 discharge feature simplifies safety certification processes for mains-connected devices.

AC DC Converters, Offline Switchers Part Context

This component belongs to the NCP1341 series of quasi-resonant controllers. It is designed by onsemi for high-performance off-line power conversion. The series focuses on reducing electromagnetic interference through frequency modulation and valley switching techniques.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1342ANDBDD1R2G

AC DC Converters, Offline Switchers FAQ

How does the NCP1341 manage light load conditions?

It utilizes burst mode skipping to manage power transfer while minimizing audible noise and maintains efficiency through minimum peak current modulation.

What protection features are included?

The device includes internal undervoltage detection, non-dissipative over-power protection, latch-overvoltage, and NTC-ready overtemperature protection.