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标题: 基于UCC28722Constant-Voltage, Constant-Current Controller with Primary-Side R... [打印本页]

作者: iczoom188    时间: 2018-11-27 17:02
标题: 基于UCC28722Constant-Voltage, Constant-Current Controller with Primary-Side R...
基于UCC28722Constant-Voltage, Constant-Current Controller with Primary-Side Regulation..
  1 特性
  低于 50mW 的无负载功耗
  一次侧稳压 (PSR) 免除了对光耦合器的需要
  动态双极性结型晶体管 (BJT) 驱动
  线路和负载具有 ±5% 电压调节和电流调节能力
  80kHz 最大开关频率可实现高功率密度充电器设计
  针对最高总体效率的准谐振谷值开关运行
  宽 VDD 范围允许使用小型偏置电容器
  输出过压、低线路和过流保护功能
  可编程电缆补偿
  小外形尺寸晶体管 (SOT) 23-6 封装
  2 应用
  用于消费类电子产品的 USB 兼容适配器和充电器
  智能电话
  平板电脑
  摄像机
  适用于电视和台式机的备用电源
  白色家电
  3 说明
  UCC28722 反激电源控制器无需使用光耦合器即可提供单独输出的恒定电压 (CV) 和恒定电流 (CC) 输出稳压。此器件处理来自一次侧电源开关和辅助反激式绕组的信息,以对输出电压和电流进行精确控制。
  可动态控制工作状态并定制调制配置文件,支持在所有负载条件下高效运行,并且不会影响输出瞬态响应。
  UCC28722 所采用的控制算法使得工作效率符合甚至超过现行标准。输出驱动接口与双极型晶体管功率开关相连实现了低成本转换器设计。带有谷值开关的断续导通模式 (DCM) 减少了开关损耗,调制开关频率和一次侧峰值电流振幅(FM AM)可在整个负载和线路范围内保持高转换效率。
此控制器的最大开关频率为 80kHz,并且一直保持对变压器内峰值一次侧电流的控制。输出过压和过流以及输入欠压保护 特性 有助于抑制一次侧和二次侧应力分量。此外,UCC28722 可通过设定外部电阻来补偿电缆中的压降。
TI产品现货库存在线购买:https://www.iczoom.com/brand/509-c-1-20.html
  The UCC28722 is a flyback power supply controller that provides accurate voltage and constant current regulation with primary-side feedback, eliminating the need for opto-coupler feedback circuits. The controller operates in discontinuous conduction mode with valley-switching to minimize switching losses. The modulation scheme is a combination of frequency and primary peak current modulation to provide high conversion efficiency across the load range. The control law provides a wide-dynamic operating range of output power, which allows the power designer to achieve less than 75-mW of stand-by power.
  During low-power operating ranges, the device has power-management features to reduce the device operating current at operating frequencies below 28 kHz. Accurate voltage and constant current regulation, fast dynamic response, and fault protection are achieved with primary-side control. A complete charger solution can be realized with a straightforward design process, low cost and low component count.





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