TI UCC28740 36W高效适配器参考设计
TI公司的UCC28740是绝缘-反激电源控制器,采用光耦器来提高大负载的瞬态响应,恒流(CC)稳压通过初级边稳压(PSR)来实现.电流稳定度±5%,电压稳定度±1%,器件集成了700V起动开关,动态控制工作状态,支持超低待机功耗,主要用在AC/DC电源,电动自行车,服务器PSU,低端洗衣机,烘干机,微波炉,太阳能逆变器等.本文介绍了UCC28740主要特性,框图, 设计案例以及85 - 265VAC输入12V@3A 36W高效适配器参考设计主要特性,电路图和材料清单.
The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. Constant-Current (CC) regulation is accomplished through Primary-side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current.
An internal 700-V startup switch, dynamically-controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.
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