NCP1340A3D1R2G

AC DC Converters, Offline Switchers Overview

The NCP1340A3D1R2G is a high-voltage quasi-resonant flyback controller from onsemi, designed for AC-DC converters. It operates within an input voltage range of 9 V to 28 V and utilizes current-mode control with resonant switching technology. The device supports a flyback topology and is housed in a SOIC-9 package. Key electrical parameters include a nominal input voltage of 12 V, a maximum operating temperature of +125 °C, and a minimum operating temperature of -40 °C. It features a switching frequency of 25 kHz and a typical operating supply current of 1 mA.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage startup circuit that reduces standby power consumption by eliminating traditional resistive startup components.
• Includes an automatic X2 capacitor discharge mechanism compliant with safety standards, removing the need for external discharge resistors.
• Employs proprietary valley-lockout switching to ensure stable operation across varying loads without frequency jitter.
• Features non-dissipative over-power protection to maintain constant maximum output power regardless of input voltage variations.

AC DC Converters, Offline Switchers Applications

• AC-DC adapters
• Open-frame power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'A3' against the manufacturer's official documentation to confirm pinout and functional compatibility, as suffixes often denote package or tape-and-reel variations. Confirm RoHS compliance status directly with the supplier. Check for end-of-life notices or obsolescence warnings, as this part number may have limited availability compared to newer revisions. Ensure the ordering quantity matches the required packaging format.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs prioritizing low component count and cost-effectiveness in offline power applications. It is suitable for systems requiring efficient light-load performance through frequency foldback and valley locking. Consider the SOIC-9 package constraints for thermal management. Verify that the integrated protections meet the specific safety requirements of the target application without needing additional external circuitry.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1340 series of quasi-resonant controllers. It shares core functionalities with variants like the NCP1341 but lacks the Power Excursion Mode (PEM) feature found in the NCP1341. The series is designed for high-performance off-line converters, offering integrated protections and efficiency optimizations typical of modern flyback controller architectures.

AC DC Converters, Offline Switchers Replacement Considerations

The NCP1340B3D1R2G is a related variant within the same family. Verify if the 'B' suffix indicates a different package tolerance or revision level. Cross-reference datasheets to ensure pin compatibility and identical electrical characteristics before substitution.