IUCC2461090WLLC串聯(lián)諧振電源轉(zhuǎn)換器解決方案

1、TI UCC24610 90W LLC串聯(lián)諧振電源轉(zhuǎn)換器解決方案TI 公司的UCC24610是5V系統(tǒng)的綠色整流控制器，當(dāng)采用單獨(dú)電源時(shí)LLC輸出可高達(dá)15V，工作頻率高達(dá)600kHz，VDS MOSFET電流檢測(cè)，能從輕負(fù)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(zhuǎn)換器。本文介紹了UCC24610主要特性，功能方框圖，反激拓?fù)淇驁D和LLC串聯(lián)諧振轉(zhuǎn)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(zhuǎn)換器電路圖和相應(yīng)的材料清單。A 90-W, High-Efficiency, LLC Series-Resonant Conver

2、ter with Secondary-Side Synchronous RectificationThe 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 becau

3、se 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

4、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

5、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 requireme

6、nts.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 secon

7、dary-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-t

8、o-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：Secon

9、dary-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

10、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 CountUCC24610應(yīng)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?fù)淇驁D圖3。UCC24610 LLC諧振半橋框圖圖4。UCC24610采用初級(jí)MOSFET漏極驅(qū)動(dòng)SYNC輸入電路圖圖5。UCC24610 LLC