AP31251中文资料GREEN MODE PWM CONTROLLER数据手册Diodes规格书

描述 Description

The AP31251 is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters.

The PWM switching frequency at normal operation is internally fixed (about 65kHz). In middle load, the IC will enter green mode to improve system efficiency with the help of frequency foldback. A minimum switching frequency (about 20kHz) is set to avoid the audible noise. In no load or light load, the IC will enter the burst mode to minimize standby power. Furthermore, the frequency dithering function is built-in to reduce EMI emission.

Internal slope compensation allows more stable Peak-Current Mode control over wide range of input voltage and load conditions. Internal line compensation ensures constant output power limit over entire universal line voltage range.

Comprehensive protection features are included, such as cycle-bycycle current limit (OCP), VCC Over Voltage Protection (VOVP),internal OTP, Over Load Protection (OLP) and pins’ fault protection. The versatile latch functions can be implemented using a minimal number of external components.

特性 Features

•Very Low Start-Up Current
•Current Mode Control
•Non-Audible-Noise Green-Mode Control
•Internal Slope Compensation
•Soft Start during Startup Process
•Frequency Fold Back for High Average Efficiency
•Secondary Winding Short Protection with FOCP
•Soft Switching (Soft Driver and Smart Jitter) for Reducing EMI
•VCC Maintain Mode
•Useful Pin Fault Protection:SENSE Pin FloatingCTRL Pin Short to GroundFB/Opto-Coupler Open/Short
•Comprehensive System Protection Feature:VCC Over Voltage Protection (VOVP)Over Load Protection (OLP)
•Optional Latch Mode for VOVP, OLP and CTRL Pin Protection
•Mini Size Package of SOT26
•Pin to Pin Compatible with AP3105NA
•Moisture Sensitivity: MSL Level 3 per J-STD-020
•Terminals: Finish – Matte Sn Plated Leads, Solderable per M2003 JESD22-B102, Method 208
•Weight: 0.016 grams (Approximate)
•Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
•Halogen and Antimony Free. “Green” Device (Note 3)
•For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAPcapable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/

应用 Application

• Switching AC-DC Adapter/Charger

• ATX/BTX Auxiliary Power

• Set-Top Box (STB) Power Supply

• Open Frame Switching Power Supply

简介

AP31251属于集成电路（IC）的ACDC转换器离线开关。由制造生产的AP31251AC 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。