NXP TEA1720B3T 10W智能手机充电器解决方案

NXP公司的TEA1720B3T是小型低成本开关电源(SMPS)控制器,用于12.5W充电器,在工作模式最小化音频噪音,和USB电池充电和能源之星2.0兼容,无负载功耗< 20 mW,具有多种保护特性,主要用在智能手机和媒体平板电脑12.5W电池充电器以及TV和台式PC的待机电源.本文介绍了TEA1720B3T 主要特性和优势,功能框图, 典型应用电路图以及TEA1720ADB1132 10W充电器主要特性,输入和输出指标,电路图,材料清单和PCB设计文件.
The TEA1720B3T is a small and low cost Switched Mode Power Supply (SMPS) controller IC for low power applications (up to 12.5 W) and operates directly from the rectified universal mains input. The device includes an emitter switch for driving an external low-cost bipolar power transistor. It has been optimized for flyback converter topologies to provide high-efficiency over the entire load range with ultra-low power consumption in the no-load condition. It provides a circuit for fast start-up directly from the rectified mains voltage without any external bleeder circuits.
The converter operates as a regulated voltage source from no-load up to the maximum output current and operates as current source that delivers the maximum current over a broad output voltage range. Using the TEA1720B3T a low power converter can be built at minimum cost and with the minimum number of external components.
The controller regulates the output voltage with primary-side sensing which eliminates the need for an additional secondary feedback circuitry and simplifies the design. At higher power levels, a frequency and current control mode is used. It operates with Burst mode control at low power levels and no-load condition. The burst mode minimizes audible noise and provides an energy save state which reduces the power consumption in no-load condition. The Burst mode frequency of 400 Hz enables no-load power consumption < 20 mW at high mains input.
A fast transient response is obtained when the TEA1720B3T is used in combination with the TEA1705 transient controller at the secondary side. The fast transie...