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NCP1050ST136T3G

NCP1050ST136T3G Description

The NCP1050ST136T3G from onsemi is a high-performance offline switching IC designed for flyback topology applications. This obsolete but robust component integrates an internal 700V MOSFET switch, operating at a fixed 136kHz switching frequency, making it suitable for isolated power supplies up to 40W. With a 7.5V to 10V supply range and an 8.5V startup voltage, it ensures reliable operation in demanding environments. The device is RoHS3 compliant and REACH unaffected, adhering to environmental regulations while offering surface-mount (SOT-223) packaging for compact designs.

NCP1050ST136T3G Features

• Integrated 700V MOSFET reduces external component count, simplifying PCB layout.
• Fixed 136kHz frequency minimizes EMI interference while maintaining efficiency.
• Wide supply voltage range (7.5V–10V) ensures stable operation under varying input conditions.
• Comprehensive fault protection including current limiting, open-loop detection, overload, and over-temperature shutdown.
• High duty cycle (77%) maximizes power delivery in constrained designs.
• Moisture Sensitivity Level (MSL) 1 allows unlimited floor life, ideal for high-volume manufacturing.

NCP1050ST136T3G Applications

This IC is optimized for isolated AC/DC power conversion in:

• Auxiliary power supplies for industrial equipment.
• Consumer electronics like set-top boxes and adapters.
• LED drivers requiring high-voltage handling.
• Offline battery chargers with robust protection features.
  Its flyback topology and high breakdown voltage make it particularly suitable for space-constrained, cost-sensitive designs needing reliable offline switching.

Conclusion of NCP1050ST136T3G

While marked as obsolete, the NCP1050ST136T3G remains a dependable choice for offline power conversion due to its high integration, robust protection, and efficiency. Engineers seeking a proven, compact solution for 40W isolated supplies may still leverage its advantages in legacy or niche applications. For newer designs, checking onsemi’s updated portfolio is recommended.