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| SSL5511T 36W调光LED驱动电源解决方案 |
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| 文章来源： 更新时间：2014/6/27 11:18:00 |
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NXP公司的SSL5511T是离线可调光LED控制器,可调光控制模拟或数字输入,可调光范围大,单级拓扑可降低PCB占位面积,集成了起动JFET,支持多种转换器拓扑,可选择低THD或低LED电流波动模式,主要用在通用照明如遥控灯和智能灯.本文介绍了SSL5511T主要优势和特性,框图和典型应用电路,以及可调光36W评估板SSL5511DB1234主要特性与指标,电路图,电路图,材料清单和PCB元件布局图和变压器框图和主要指标.
The SSL5511T is an offline dimmable controller IC, intended to drive dimmable LEDs in general lighting applications, like remote-controlled luminaires and smart lamps.
SSL5511T主要优势:
• 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 up directly from the High-Voltage (HV) supply by an internal high-voltage current source.Flyback, buck and buck-boost circuit topologies are supported. Primary side sensing provides accurate output current control.
The IC can detect analog signals (according to IEC60929 annex E) or digital control signals and translate them to a continuous LED current in multiple ways. It can operate in three switching modes at two switching frequency ranges. It offers tradeoffs between the output current ripple, the mains current Total Harmonic Distortion (THD) and the application size.
SSL5511T主要特性:
The IC incorporates all required protection features.
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 application
size
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:
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output short protection
Output open protection
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, dimmable current 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 level ranges 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反激应用电路:LTHD,输入=230VAC,输出=35V/200mA
评估板SSL5511DB1234
This user manual describes the operation of the SSL5511DB1234 demo board featuring the SSL LED driver SSL5511T in a 36 W isolated application for universal mains.
The SSL5511DB1234 demo board is designed for 48 V at a 700 mA LED string load.
The single layer PCB with dimensions 110 mm 50 mm 30 mm is intended for fixtures used in SSL applications.
The SSL5511DB1234 demo board provides a simple and effective solution for a universal mains application. It includes a high Power Factor (PF), high efficiency, and a low Total Harmonic Distortion (THD).
The topology uses a single stage flyback converter without Power Factor Correction(PFC) pre-stage.
评估板SSL5511DB1234主要特性:
• SSL5511T LED driver
• Single stage flyback converter without PFC pre-stage
• Analog (0 V to 10 V) dimming interface or PWM dimming
• High efficiencies maintained for 50 % and 25 % loads
• Open LED string protection
• Short circuit LED string protection
• OverCurrent Protection (OCP)
• OverTemperature Protection (OTP)
• Power factor > 0.95
• THD < 10 % for 120 V (AC) to 230 V (AC)
• Efficiency ranging from 88 % to 90 % across the universal mains 90 V to 305 V (AC)
• Minimal changes required in application for a non-dimmable design using the
SSL5101T
• Compliant with IEC61000-3-2 harmonics standard
• Compliant with FCC15 EMC standard
评估板SSL5511DB1234主要指标:
图3.评估板SSL5511DB1234外形图
图4.评估板SSL5511DB1234电路图
评估板SSL5511DB1234材料清单:
图5.评估板SSL5511DB1234 PCB元件布局图
图6.评估板SSL5511DB1234反激变压器外形图
反激变压器主要指标:
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