TI 公司的UCC24610是5V系统的绿色整流控制器，当采用单独电源时LLC输出可高达15V，工作频率高达600kHz，VDS MOSFET电流检测，能从轻负载和睡眠模式中同步叫醒，主要用在AC/DC 5V适配器，5V偏压电源，低压整流电路和反激和LLC转换器。本文介绍了UCC24610主要特性，功能方框图，反激拓扑框图和LLC串联谐振转换器框图，以及变压器配置，自同步配置和电容配置的LLC串联谐振转换器电路图和相应的材料清单。

　　A 90-W, High-Efficiency, LLC Series-Resonant Converter with Secondary-Side Synchronous Rectification

　　The UCC24610 Green Rectifier Controller is optimized for 5-V systems and can be used for LLC outputs up to 15 V when a separate 5-V supply is available. Above 15 V the UCC24610 is limited by the 50-V maximum voltage rating of the VD pin. This is because in a conventional secondary rectifier arrangement, that employs two rectifiers with a center-tapped secondary winding, each rectifier sees a peak reverse voltage equal to twice the regulated output.

　　The scope of this reference design guide is to describe the design and performance of a functional circuit that extends the application of the UCC24610 to systems with output voltages up to 30 V. This is achieved using an alternate topology for secondary rectification and addressing the design constraints that the topology presents. Two configurations are described for synchronizing the turn-off of each SR circuit using the gate-drive signals on the primary side of the converter.

　　An area not addressed by this guide is electromagnetic compatibility (EMC). For most applications, EMI filter components are added so that the design meets applicable environmental and system compatibility requirements.

　　To comply with EMC standards, components such as input and output filters are required to suppress electromagnetic interference (EMI).

　　This GREEN Rectifier™ controller is a high-performance controller and driver for standard and logic-level N-channel MOSFET power devices used for low-voltage secondary-side synchronous rectification.

　　The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also indirectly reduces primary-side losses as well, due to compounding of efficiency gains.

　　Using drain-to-source voltage sensing, the UCC24610 is ideal for Flyback and LLC-Resonant power supplies but can also be used with other power architectures. The UCC24610 is optimized for output voltages from 4.5 V to 5.5 V, and is suitable for use with lower and higher output voltages as well.

　　UCC24610主要特性：

　　Secondary-Side Controller Optimized for 5-V Systems

　　Up to 600-kHz Operating Frequency

　　VDS MOSFET-Sensing

　　1.6-ohm Sink, 2.0-ohm Source Gate-Drive Impedances

　　Micro-Power Sleep Current for 90+ Designs

　　Automatic Light-Load Management

　　Synchronous Wake-Up From Sleep and Light-Load Modes

　　Protection Features on Programming Inputs

　　SYNC Input for CCM Operation

　　20-ns Typical Turn-Off Propagation Delay

　　Improved Efficiency and Design Flexibility Over Traditional Diode Solution

　　May Be Biased Directly From 5-V Output

　　Minimal Component Count

　　UCC24610应用：

　　AC/DC 5-V Adapters

　　5-V Bias Supplies

　　Low Voltage Rectification Circuits

　　Flyback and LLC Converters

　　图1。UCC24610功能方框图

　　图2。UCC24610反激拓扑框图

　　图3。UCC24610 LLC谐振半桥框图

　　图4。UCC24610采用初级MOSFET漏极驱动SYNC输入电路图

　　图5。UCC24610 LLC串联谐振转换器框图

　　图6。同步开关MOSFET的倍压整流电路图

　　图7。UCC24610 LLC串联谐振转换器电路图：自同步配置

　　图8。UCC24610 LLC串联谐振转换器电路图：变压器配置

　　图9。UCC24610 LLC串联谐振转换器电路图：电容配置

　　自同步配置材料清单（基本电路）：

　　变压器同步配置附加材料清单：

　　电容同步配置附加材料清单：