TI 公司的UCC24610是5V系統(tǒng)的綠色整流控制器，當采用單獨電源時LLC輸出可高達15V，工作頻率高達600kHz，VDS MOSFET電流檢測，能從輕負載和睡眠模式中同步叫醒，主要用在AC/DC 5V適配器，5V偏壓電源，低壓整流電路和反激和LLC轉換器。本文介紹了UCC24610主要特性，功能方框圖，反激拓撲框圖和LLC串聯(lián)諧振轉換器框圖，以及變壓器配置，自同步配置和電容配置的LLC串聯(lián)諧振轉換器電路圖和相應的材料清單。
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應用：
AC/DC 5-V Adapters
5-V Bias Supplies
Low Voltage Rectification Circuits
Flyback and LLC Converters
圖1。UCC24610功能方框圖
圖2。UCC24610反激拓撲框圖
圖3。UCC24610 LLC諧振半橋框圖
圖4。UCC24610采用初級MOSFET漏極驅動SYNC輸入電路圖
圖5。UCC24610 LLC串聯(lián)諧振轉換器框圖
圖6。同步開關MOSFET的倍壓整流電路圖
圖7。UCC24610 LLC串聯(lián)諧振轉換器電路圖：自同步配置
圖8。UCC24610 LLC串聯(lián)諧振轉換器電路圖：變壓器配置
圖9。UCC24610 LLC串聯(lián)諧振轉換器電路圖：電容配置
自同步配置材料清單（基本電路）：
變壓器同步配置附加材料清單：
電容同步配置附加材料清單：
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