NCP1342ADDCDAD1R2G

AC DC Converters, Offline Switchers Overview

The NCP1342ADDCDAD1R2G is a quasi-resonant flyback controller from onsemi, designed for high-performance offline power converters. It operates within a VCC range of 9V to 28V and supports a switching frequency up to 500kHz. The device utilizes current-mode control with valley-lockout switching to minimize noise and switching losses. Key electrical parameters include a 700V breakdown voltage and operation across a temperature range of -40°C to +125°C. It features integrated protections such as overvoltage, overtemperature, and brownout detection.

AC DC Converters, Offline Switchers Feature Summary

• Valley-lockout switching circuitry ensures stable operation down to the sixth valley, reducing acoustic noise and switching losses.
• Integrated active X2 capacitor discharge capability enables no-load power consumption below 30 mW.
• Non-dissipative over-power protection maintains constant maximum output power regardless of input voltage variations.
• Rapid frequency foldback combined with minimum peak current modulation optimizes efficiency at light loads.

AC DC Converters, Offline Switchers Applications

• Medium or high power AC-DC adapters
• Ultra-high density AC-DC adapters
• USB PD compliant power supplies
• Laptop adapters
• Flat panel TV SMPS

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'ADD' against official datasheets to confirm pinout and feature set differences compared to standard variants. Confirm RoHS compliance status and check for recent Product Change Notifications (PCN) regarding discontinuation or manufacturing site changes before finalizing procurement plans.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high integration and low standby power. The wide VCC range and robust protection features make it suitable for universal input applications. Ensure thermal management aligns with the specified junction temperature limits and verify compatibility with the intended transformer design for optimal valley switching performance.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1342 series of quasi-resonant flyback controllers. It is engineered to replace older fixed-frequency controllers by offering superior efficiency through variable frequency operation. The series is widely used in consumer electronics and IT equipment where energy efficiency standards are strict.

AC DC Converters, Offline Switchers Replacement Considerations

The NCP1342AMDCDAD1R2G is listed as a manufacturer-recommended alternative. Verify functional equivalence and pin compatibility before substitution. Other NCP1342 variants may differ in packaging or specific protection thresholds.