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| SSL5511T 36W調(diào)光LED驅(qū)動電源解決方案 |
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| 文章來源： 更新時間：2014/6/27 11:18:00 |
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NXP公司的SSL5511T是離線可調(diào)光LED控制器,可調(diào)光控制模擬或數(shù)字輸入,可調(diào)光范圍大,單級拓撲可降低PCB占位面積,集成了起動JFET,支持多種轉(zhuǎn)換器拓撲,可選擇低THD或低LED電流波動模式,主要用在通用照明如遙控?zé)艉椭悄軣?本文介紹了SSL5511T主要優(yōu)勢和特性,框圖和典型應(yīng)用電路,以及可調(diào)光36W評估板SSL5511DB1234主要特性與指標,電路圖,電路圖,材料清單和PCB元件布局圖和變壓器框圖和主要指標.
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主要優(yōu)勢:
• 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應(yīng)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
圖1. SSL5511T框圖
圖2. SSL5511T反激應(yīng)用電路:LTHD,輸入=230VAC,輸出=35V/200mA
評估板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.
評估板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
評估板SSL5511DB1234主要指標:
圖3.評估板SSL5511DB1234外形圖
圖4.評估板SSL5511DB1234電路圖
評估板SSL5511DB1234材料清單:
圖5.評估板SSL5511DB1234 PCB元件布局圖
圖6.評估板SSL5511DB1234反激變壓器外形圖
反激變壓器主要指標:
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