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NCP1377 from ON,ON Semiconductor

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NCP1377

Manufacturer: ON

QR SMPS controller

Partnumber Manufacturer Quantity Availability
NCP1377 ON 22 In Stock

Description and Introduction

QR SMPS controller # Introduction to the NCP1377: A High-Performance Current-Mode PWM Controller  

The NCP1377 is a versatile current-mode PWM (Pulse Width Modulation) controller designed for offline power supply applications. It integrates advanced features to enhance efficiency, reliability, and performance in switch-mode power supplies (SMPS).  

Operating in quasi-resonant mode, the NCP1377 minimizes switching losses by enabling zero-voltage switching (ZVS), making it ideal for flyback converters in AC-DC adapters, LED drivers, and auxiliary power supplies. Its built-in brownout protection, overvoltage protection (OVP), and overload detection ensure robust operation under varying load conditions.  

The controller includes a high-voltage startup circuit, reducing external component count and simplifying design. Its adjustable frequency foldback feature enhances efficiency at light loads, while the skip-cycle mode further optimizes power consumption in standby applications.  

With its compact package and minimal external circuitry, the NCP1377 offers a cost-effective solution for designers seeking high efficiency and reliability in power conversion systems. Its precise current sensing and tight regulation make it suitable for demanding applications where stable and efficient power delivery is critical.  

The NCP1377 represents a balanced combination of performance and simplicity, making it a preferred choice for modern power supply designs.

Application Scenarios & Design Considerations

QR SMPS controller

Alternative Part Number

  • UC3842 --: Industry-standard current-mode PWM controller widely used in offline flyback supplies; functionally similar to the NCP1377 and available from multiple sources.
  • ICE2A0565 --: Integrated offline PWM controller with built-in high-voltage MOSFET, comparable to the NCP1377's application in low-power SMPS designs.
  • VIPER22A --: Offline switching regulator with integrated power switch, suitable as a functional substitute in low-power AC-DC converter designs.

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