NCP1247DD100R2G

AC DC Converters, Offline Switchers Overview

The NCP1247DD100R2G is a fixed-frequency current-mode PWM controller designed for flyback converters. It features Dynamic Self-Supply, which simplifies auxiliary winding design by eliminating the need for external startup and biasing components. The device operates at a fixed switching frequency of 100 kHz and supports high-voltage startup. It integrates comprehensive protection mechanisms including cycle-by-cycle current limiting, output overvoltage protection, and open-loop detection to ensure robust system reliability.

AC DC Converters, Offline Switchers Feature Summary

• Dynamic Self-Supply functionality eliminates external startup resistors and auxiliary bias windings
• Fixed-frequency current-mode control architecture for stable regulation
• Integrated protection against overvoltage, open-loop faults, and excessive current

AC DC Converters, Offline Switchers Applications

• Offline flyback power supplies
• AC-DC adapters with simplified bias circuits
• Low-to-medium power isolated converter designs

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized onsemi distributors or certified partners. Confirm the specific suffix DD100R2G matches the required package and tape-and-reel specifications. Check for recent Product Change Notifications regarding manufacturing site transfers or material updates. Ensure storage conditions comply with moisture sensitivity level requirements prior to assembly.

AC DC Converters, Offline Switchers Selection Notes

Select this controller when designing flyback converters that require simplified auxiliary supply architectures. The Dynamic Self-Supply feature reduces bill-of-materials count and board space. Verify that the 100 kHz fixed frequency aligns with electromagnetic interference filtering requirements. Ensure the input voltage range and output power demands fall within the controller's operational limits defined in the electrical characteristics table.

AC DC Converters, Offline Switchers Part Context

This component belongs to the NCP1247 series of offline switchers. It is part of onsemi's portfolio of current-mode PWM controllers optimized for cost-sensitive and space-constrained applications. The series emphasizes ease of implementation through integrated self-biasing technologies, distinguishing it from traditional controllers requiring complex startup networks.

AC DC Converters, Offline Switchers Replacement Considerations

Direct pin-compatible substitutes may include other NCP124x variants with matching frequency and package codes. Verify functional equivalence regarding the Dynamic Self-Supply behavior and protection thresholds before substitution.