原标题：NXP SSL5511T 60W(145 V-400 mA)LED驱动方案

　　nxp公司的SSL5511T是离线可调光LED控制器,支持反激,降压和降压-升压拓扑,可选择低THD或低LED电流波纹模式,模拟IEC60929输入或数字控制输入调光,集成了起动JFET,具有多种保护,主要用在100 V (AC), 120 V (AC)和230 V (AC) LED照明.本文介绍了SSL5511T主要特性和优势,框图,反激应用电路,以及演示板SSL5511DB1274主要特性,电路图和材料清单.

　　The SSL5511T is an offline dimmable controller IC, intended to drive dimmable LEDs ingeneral lighting applications, like remote-controlled luminaires and smart lamps.

　　The main benefits of this IC include:

　　• Dim level control with either an analog or a digital control input

　　• Selectable modes for high power factor or low ripple, allowing a wide LED power range

　　• Large dimming range

　　• Single stage topology for small PCB footprint

　　• Ease of design-in

　　• Integrated start-up JFET

　　• Low electronic Bill Of Material (BOM)

　　• Various converter topologies supported

　　The IC drives an external switch for easy power scaling. It has been designed to start updirectly from the High-Voltage (HV) supply by an internal high-voltage current source.

　　Flyback, buck and buck-boost circuit topologies are supported. Primary side sensingprovides accurate output current control.

　　The IC can detect analog signals (according to IEC60929 annex E) or digital controlsignals and translate them to a continuous LED current in multiple ways. It can operate inthree switching modes at two switching frequency ranges. It offers tradeoffs between theoutput current ripple, the mains current Total Harmonic Distortion (THD) and theapplication size. The IC incorporates all required protection features.

　　SSL5511T主要特性和优势:

　　 LED controller IC for driving strings of LEDs or high-voltage LEDs from rectified mains

　　 High-efficiency switch mode buck, flyback or buck-boost controller driving an external power FET

　　 Two maximum switching frequencies for highest efficiency or smallest applicationsize

　　 Zero current switching at switch turn-on

　　 Zero voltage or valley switching at switch turn-on

　　 Selectable low THD or low LED current ripple modes

　　 Analog IEC60929 input or digital control input for dimming

　　 Continuous (analog) regulation of LED current in both the dimming control modes

　　 Dim curve selection based on the control input type

　　 No binning on LED forward voltage required

　　 LED current accuracy within ±4 % across variations in components and conditions

　　 Built-in Protections:

　　 UnderVoltageLockOut (UVLO)

　　 Leading Edge Blanking (LEB)

　　 OverCurrent Protection (OCP)

　　 Internal OverTemperature Protection (OTP)

　　 Brownout protection

　　 Output Short Protection (OSP)

　　 Output open OverVoltage Protection (OVP)

　　 Mains synchronization loss protection

　　 Low component count LED driver solution

　　 Compatible with wall switches with built-in indication light during standby(

　　 IC lifetime matches or surpasses LED lamp lifetime

　　SSL5511T应用:

　　Compact mains connected, remote-controlled LED lamps with accurate, dimmablecurrent output for single or universal mains voltages, including 100 V (AC), 120 V (AC)and 230 V (AC). External components determine the power level. The power levelranges from 4 W to over 25 W. Applications fit in common form factors like PAR,GU10, A19, and the candle form factor.

　　图1.SSL5511T框图

　　图2.SSL5511T反激应用电图:LTHD;输入= 230 V (AC);输出= 35 V/200 mA

　　演示板SSL5511DB1274

　　The SSL5511T is a high-efficient analog/PWM dimmable controller IC for LED solutions. The SSL5511DB1274 demo board is a single PCB dimmable LED driver example of a non-isolated buck-boost stage.

　　The SSL5511DB1274 demo board drives a constant current through the LEDs from a rectified 230 V or 277 V mains input voltage. This 60 W demo board is optimized for a LED string voltage of approx. 145 V at 400 mA. The design and the components used are optimized for single sided SMD only PCB design. The application is tailored for streetlight applications.

　　The solution is documented as a "design prototype" in Solution Brief SB00005.

　　图3.演示板SSL5511DB1274外形图

　　演示板SSL5511DB1274主要特性:

　　Single PCB with LED and SMPS converter enabling high reliability and low production costs

　　SMD only PCB design enabling full automatic component placement

　　Single layer FR4 PCB, 120 x 240 mm, 70 um copper thickness

　　Efficient non-isolated buck-boost QR topology

　　230 and 277 VAC input voltage

　　Short turn-on delay time

　　Low mains current harmonics

　　Low output ripple filter

　　1 V to 10 V dimmable when using SSL5511T

　　Non dimmable option when using SSL5101T

　　3 x series x 10 parallel output LEDs

　　演示板SSL5511DB1274指标:

　　演示板SSL5511DB1274材料清单: