AP3301中文资料Quasi-Resonant PWM Controller数据手册Diodes规格书

描述 Description

The AP3301 is a peak-current control, Quasi-Resonant (QR) PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters.
At no load or light load, the IC will enter the burst mode to minimize standby power consumption. The minimum switching frequency (about 20kHz) is set to avoid the audible noise. At medium load, the IC will enter valley lock QR mode with frequency foldback to improve system efficiency and EMI performance. The maximum switching frequency (about 120kHz) is set to clamp the QR frequency to improve efficiency. At low line input & heavy load, when switching frequency decreases below 62KHz with output load increasing, the IC will enter CCM mode with fixed switching frequency of 62kHz to optimize low line power conversion efficiency. 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 piecewise linear line compensation ensures constant output power limit over entire universal line voltage range.
Comprehensive protection features are included, such as brown out protection, cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP), Secondary-Side Output OVP (SOVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection.

特性 Features

Very Low Start-up Current
Multi-Mode Control
Quasi-Resonant Operation with Valley Lock
Fixed Frequency CCM Operation at Low Line Heavy Load
Non-Audible-Noise Quasi-Resonant Control
Internal Slope Compensation
Soft Start During Startup Process
Frequency Fold Back for High Average Efficiency
Secondary Winding Short Protection with FOCP
Frequency dithering for Reducing EMI
VCC Maintain Mode
Useful Pin Fault Protection: SENSE Pin Floating, FB/Opto-coupler Open/Short
Comprehensive System Protection Feature: VCC Over Voltage Protection (VOVP), Over Load Protection (OLP)
Brown Out Protection (BNO)
Secondary Side OVP (SOVP)
Mini Size Package of SOT26
Totally Lead-free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device

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

AP3301属于集成电路（IC）的ACDC转换器离线开关。由Diodes制造生产的AP3301AC 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。