NCP1124数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

The NCP1124 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1124 can be safely designed for international conditions without jeopardizing the overall reliability. The NCP1124 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies. A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation. With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current.

特性 Features

• 650 V Avalanche Rated MOSFET
• Rugged MOSFET for robust design
• Fixed−Frequency 65 or 100 kHz Current−Mode Control with Adjustable Internal Ramp Compensation
• Ability to scale for efficiency or size
• Frequency Foldback Down to 26 kHz and Skip−Cycle for Light Load Efficiency
• Eliminate acoustic noise and improved efficiency at light loads
• Adjustable Current Limit with External Resistor
• Scale for various designs 5W~20W
• 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
• Provides more robust protection without worrying about the coupling of the aux winding
• Frequency Jittering in Normal and Frequency Foldback Modes
• Improved efficiency at light load / Improved EMI over the entire load
• Option for Auto-Recovery or Latched Short-Circuit Protection
• Flexible protection options
• Less than 100 mW Standby Power at High Line
• EPS 2.0 Compliant

应用 Application

• Power Supply
• Power supply for DVD, STB, CD-Player
• Aux supply for TV, USB, Appliance

简介

NCP1124属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1124AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。